Extraordinarius

Prof. Dr.-Ing. Georg Fischer

Kontakt

  • E-Mail:
  • Telefon: 09131/85-27186
  • Fax: 09131/302951
  • Raum: 4.22
  • Cauerstraße 9
    91058 Erlangen

Über Georg Fischer

Lebenslauf

1965 geboren in Wachtendonk am Niederrhein/Deutschland
1986-1992 Studium der Elektrotechnik an der RWTH Aachen (Deutschland)
Schwerpunkte in Nachrichtentechnik, HF, Mikrowellentechnik, Theoretischer Elektrotechnik, Antennen und Akustik
1992 Dipl.-Ing. (TH) Elektrotechnik - Nachrichtentechnik
1993-1996 Wiss. Mitarbeiter am Fachgebiet Nachrichtentechnik der Universität Paderborn (Germany)
Schwerpunkte Focus in Mikrowellenschaltungstechnik, Antennen und adaptive Gruppenantennen bei 5 und 12 GHz
Feb. 1997 Dr.-Ing. (summa cum laude) vergeben durch die Universität Paderborn
Titel: Ein adaptives Empfangssystem für den Satellitenrundfunk mit Adaption der Richtcharakteristik und der Polarisation
 1996-2008 Bell Labs Research, Lucent Technologies später Alcatel-Lucent
Schwerpunkte im HF Systementwurf:
  • Basestations HF Systemarchitektur,
    Sender/Empfängertechnologie
  • Analog-Digital-Umsetzung
  • Performanzsteigerungen in der Physikalischen Schicht
  • Neue HF Technologien:
     HF-MEMS, Transistortechnologien mit großem Bandabstand SiC/GaN, Frequenzagile HF Systeme, Sendeverstärkerarchitekturen im Schaltbetrieb, Software Defined Radio, Abstimmbare Metamaterial Strukuren
  • Beiträge zur ETSI Standardisierung der Physikalischen Schicht des GSM-EDGE Systems - chairman für die SMG2WPB-EDGE
2000 Bell Labs DMTS (Distinguished Member of Technical Staff)
2001 Bell Labs CMTS (Consulting Member of Technical Staff)
Since 2001 Lehrbeauftragter an der FAU, Lehrstuhl für Hochfrequenztechnik LHFT, Prof. L.-P. Schmidt, "RF Architecture of Mobile Communication Basestations"
11.2003 Wechsel von der Vorentwicklung Basisstationstechnik zur Bell-Labs Europe Forschungsgruppe. Dort Mitarbeit in verschiedenen EU und nationalen Deutschen öffentlichen Förderprojekten, die sich mit rekonfigurierbaren HF Systemen beschäftigen.
Dec. 2006 Merger Alcatel-Lucent
2008 Vorgeschlagen als Bell Labs Fellow
Apr. 2008

Professur für Technische Elektronik am LTE der FAU Friedrich-Alexander Universität Erlangen-Nürnberg

Arbeitsfelder

  • Verstärkerarchitekturen (Schaltverstärker, Class-S, Doherty)
  • Nichtinvasiver Blutzuckersensor
  • Medizinelektronik, Biosignalerfassung, Mikrowellensensorik
  • Massive MIMO Implementierung
  • Effiziente Spektrumnutzung (UHF, Digital Dividend, PMSE)
  • Professionelle Funkmikrofone (PMSE)
  • Software Defined Radio SDR
  • Cognitive Radio CR
  • Anwendung von HF-MEMS für frequenzagile HF Systeme (low/high power)
  • Sende/Empfänger Architekturen
  • HF-System Entwurf
  • Analog-Digital Balance
  • Gesundheitsassistenzsysteme, AAL
  • Drahtlose Energieübertragung (WPT)
  • Implantatkommunikation
  • Smart Metering
  • Aktive Gruppenantennen
  • LTE Broadcast
  • Abstimmbare Filter (aktiv low power/passiv high power)

Mitgliedschaften

VDE/ITG-DGBMT-DKE
IEEE/MTT-AP-VTC-COMSOC-EMBS
EUMA/EURAMIG-RF MEMS

Standardisierungsarbeit

ETSI/3GPP
ETSI STF386 (Chairman)
VDE-DKE

Patente

Mehr als 50 Patente in den Bereichen Basisstations-HF-Architektur, Antennen, Sendeleistungsverstärker, HF-MEMS und abstimmbare Metamaterial Strukturen.

Fünf Schlüssel-EP-Patente auf dem Gebiet nichtinvasiver Glukosesensors plus verschiedenste Nationalisierungen in Europa, Asien und Amerika.

EP2457508 Recording device for recording a blood count parameter

EP2457507 Arm band with a recording device for recording a blood count Parameter

EP2458368 Recording device for recording a blood count Parameter

EP2458369 Recording device for recording a blood count Parameter

EP2457510 Recording device for recording a blood count Parameter

Siehe detaillierte Auflistung unten.

 

Zitationen

Google Scholar

 

Lehrveranstaltungen Sommersemester 2017

Lehrveranstaltungen Wintersemester 2017

  • Body Area Communications

  • Commmunications Systems Design

  • Vorlesung Digitaltechnik

  • Grundlagen der Elektrotechnik I für Medizintechnik

  • Forschungspraktikum

  • Anleitung wissenschaftlicher Arbeiten

  • Seminar über Doktorarbeiten

  • Seminar über Bachelor und Masterarbeiten

Preise & Auszeichnungen

  • G. Fischer, Nominiert für Ars legendi-Fakultätenpreis für exzellente Lehre in den Ingenieurwissenschaften, 4ING - Fakultätentage der Ingenieurwissenschaften und der Informatik an Universitäten e.V., 2017. [Bibtex]
    @prize{fischer_prize_2017,
    abstract = {excellent teaching},
    author = {Fischer, Georg},
    booktitle = {4ING - Fakultätentage der Ingenieurwissenschaften und der Informatik an Universitäten e.V.},
    cris = {fischer_prize_2017},
    year = {2017},
    month = {06},
    day = {20},
    title = {Nominiert für Ars legendi-Fakultätenpreis für exzellente Lehre in den Ingenieurwissenschaften},
    }
  • G. Fischer, ETSI standardization work in the field of PMSE (radio-mic) cognitive radio, European Telecommunications Standards Institute (ETSI), 2015. [Bibtex]
    @prize{fischer_prize_2015a,
    author = {Fischer, Georg},
    booktitle = {European Telecommunications Standards Institute (ETSI)},
    cris = {fischer_prize_2015a},
    year = {2015},
    month = {02},
    day = {05},
    title = {ETSI standardization work in the field of PMSE (radio-mic) cognitive radio},
    }
  • G. Fischer, Expert in Specialist Task Force 386, European Telecommunications Standards Institute (ETSI), 2015. [Bibtex]
    @prize{fischer_prize_2015,
    abstract = {Successful contribution to standardization work in the field of PMSE (radio-mic) cognitive radio as expert in Specialist Task Force 386 from Jan-13 to Dec-14},
    author = {Fischer, Georg},
    booktitle = {European Telecommunications Standards Institute (ETSI)},
    cris = {fischer_prize_2015},
    year = {2015},
    month = {02},
    day = {05},
    title = {Expert in Specialist Task Force 386},
    }
  • J. A. Chicharro, R. Weigel, and G. Fischer, CATRENE 2014 Innovation Award – Most Innovative Project, Cluster for Application and Technology Research in Europe on NanoElectronics, 2014. [Bibtex]
    @prize{chicarro_prize_2014,
    abstract = {für das Projekt "Elektromagnetische Zuverlässigkeit und elektronische Systeme für eMobility-Anwendungen (EM4EM)"},
    author = {Chicharro, José Antonio and Weigel, Robert and Fischer, Georg},
    booktitle = {Cluster for Application and Technology Research in Europe on NanoElectronics},
    cris = {chicarro_prize_2014},
    year = {2014},
    month = {11},
    day = {28},
    title = {CATRENE 2014 Innovation Award – Most Innovative Project},
    }
  • D. Markert, C. Haslach, H. Heimpel, A. Pascht, and G. Fischer, EUMC Young Engineer Prize, EUMA European Microwave Association, 2014. [Bibtex]
    @prize{markert_prize_2014,
    abstract = {For the paper "Phase-Modulated {DSM-PWM} Hybrids with Pulse Length Restriction for Switch-Mode Power Amplifiers"},
    author = {Markert, Daniel and Haslach, Christoph and Heimpel, Holger and Pascht, Andreas and Fischer, Georg},
    booktitle = {EUMA European Microwave Association},
    cris = {markert_prize_2014},
    year = {2014},
    month = {10},
    day = {09},
    title = {EUMC Young Engineer Prize},
    }
  • M. Kamper, G. Fischer, and G. Ulbricht, 1. Platz Elektronik Ecodesign Preis, Elektronik, 2011. [Bibtex]
    @prize{kamper_prize_2011,
    abstract = {Diplomarbeit: "Untersuchung von geschalteten Verstärkern zur Verbesserung des Wirkungsgrades bei HF Leistungsverstärkern"},
    author = {Kamper, Michael and Fischer, Georg and Ulbricht, Gerald},
    booktitle = {Elektronik},
    cris = {kamper_prize_2011},
    year = {2011},
    month = {10},
    day = {12},
    title = {1. Platz Elektronik Ecodesign Preis},
    }
  • G. Fischer, ETSI expert specialist, European Telecommunications Standards Institute (ETSI), 2011. [Bibtex]
    @prize{fischer_prize_2011,
    abstract = {Has successfully contributed to standardization work in the field of Methods, parameters and test procedures for cognitive interference mitigation techniques for use by PMSE devices},
    author = {Fischer, Georg},
    booktitle = {European Telecommunications Standards Institute (ETSI)},
    cris = {fischer_prize_2011},
    year = {2011},
    month = {01},
    day = {27},
    title = {ETSI expert specialist},
    }
  • G. Fischer, Chairman der "ETSI Specialist Task Force #386", Association of professional wireless production tecnology (APWPT), 2010. [Bibtex]
    @prize{fischer_prize_2010,
    abstract = {Würdigung des Beitrags für einen alternativen Lösungsansatz zur PMSE-Frequenzproblematik},
    author = {Fischer, Georg},
    booktitle = {Association of professional wireless production tecnology (APWPT)},
    cris = {fischer_prize_2010},
    year = {2010},
    month = {09},
    day = {27},
    title = {Chairman der "ETSI Specialist Task Force #386"},
    }
  • Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, Best student paper award, Mediterranean Microwave Symposium, 2009. [Bibtex]
    @prize{abou-chahine_prize_2013,
    author = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    booktitle = {Mediterranean Microwave Symposium},
    cris = {abou-chahine_prize_2013},
    year = {2009},
    title = {Best student paper award},
    }
  • G. Fischer, Nominiert für Zukunftspreis des Deutschen Bundespräsidenten, Bundesregierung, 2008. [Bibtex]
    @prize{fischer_prize_2008,
    abstract = {Preparation for Future, sustainability},
    author = {Fischer, Georg},
    booktitle = {Bundesregierung},
    cris = {fischer_prize_2008},
    year = {2008},
    title = {Nominiert für Zukunftspreis des Deutschen Bundespräsidenten},
    }

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Patente

  • J. Brendel, G. Fischer, and A. Schmidt, Verfahren zum Bestimmen einer Übertragungsqualität beim Empfangen von Audiosignalen, 2013. [Bibtex]
    @patent{brendel_patent_2013,
    abstract = {Es wird ein Verfahren zum Bestimmen einer Übertragungsqualität beim Empfangen von Audiosignalen beschrieben, die über eine frequenzmodulierte Strecke analog übertragen werden. Hierzu wird ein frequenzmoduliertes Audiosignal empfangen und eine IQ-Demodulation des Eingangssignals wird durchgeführt. Der I- und der Q-Zweig des demodulierten Basisbandsignales werden einer Analog/Digitalwandlung unterzogen. Alternativ kann das Eingangssignal zuerst digitalisiert und dann IQ-demoduliert werden. Eine Mehrzahl von N Samples wird erfasst. Der Betrag (B) der N Samples wird gebildet. Es wird ein Referenzwert (R) aus der Menge der N Samples bestimmt. Jedes der N Samples wird auf den Referenzwert (R) normiert. Ein Maß der Schwankungen der normierten Beträge wird bestimmt. Das Maß der Schwankungen zeigt die Qualität der Übertragungsstrecke an.},
    author = {Brendel, Johannes and Fischer, Georg and Schmidt, Axel},
    cris = {brendel_patent_2013},
    year = {2013},
    month = {06},
    day = {06},
    number = {DE102011087745A1},
    title = {Verfahren zum Bestimmen einer Übertragungsqualität beim Empfangen von Audiosignalen},
    type = {patent},
    url = {http://ip.com/pat/DE102011087745A1},
    }
  • G. Fischer, G. Adamiuk, and H. Schenkel, Meta-material filter for use in a base station of a wireless communications system, 2012. [Bibtex]
    @patent{fischer_patent_2012d,
    author = {Fischer, Georg and Adamiuk, Grzegorz and Schenkel, Horst},
    cris = {fischer_patent_2012d},
    year = {2012},
    month = {02},
    day = {17},
    number = {EP1989753A1},
    title = {Meta-material filter for use in a base station of a wireless communications system},
    type = {patent},
    url = {http://ip.com/pat/EP1989753A1},
    }
  • G. Fischer, Completing calls over a network with a malfunctioning backhaul communications link, 2012. [Bibtex]
    @patent{fischer_patent_2012c,
    author = {Fischer, Georg},
    cris = {fischer_patent_2012c},
    year = {2012},
    month = {02},
    day = {17},
    number = {EP1997283A2},
    title = {Completing calls over a network with a malfunctioning backhaul communications link},
    type = {patent},
    url = {http://ip.com/pat/EP1997283A2},
    }
  • G. Fischer and F. Pivit, Aperture Antenna Element, 2012. [Bibtex]
    @patent{fischer_patent_2012a,
    abstract = {A wide-bandwidth aperture antenna is constructed of two parallel metal plates 51, 52, each having a resonant aperture 53, 54. The apertured plates are arranged parallel to one another, with the apertures aligned. A third plate 57 is arranged parallel to the apertured plates to act as a reflector. The resonant apertures are in the form of sqares with rounded corners. Feed stubs 55 and 56 are arranged between the apertured plates and project into the region between the apertures to excite orthogonally polarized modes. The feed stubs are in the form of strips which are aligned in planes perpendicular to the planes of the apertured plates. An exemplary embodiment has a bandwidth of 1700 MHz to 3300 MHz, containing the bands used for GSM 1800, UMTS, UMTS+, Bluetooth and WLAN systems. The feed is high-impedance and the decoupling better than -11dB over the whole frequency bandwidth.},
    author = {Fischer, Georg and Pivit, Florian},
    cris = {fischer_patent_2012a},
    year = {2012},
    month = {02},
    day = {17},
    number = {US7030825B1},
    title = {Aperture Antenna Element},
    type = {patent},
    url = {http://ip.com/pat/US7030825},
    }
  • W. Eckl, G. Fischer, and G. Kaminski, Varactor with extended tuning range, 2012. [Bibtex]
    @patent{eckl_patent_2012,
    abstract = {The invention relates to a device for high-frequency and/or radio-frequency tuning. An object of the invention is to provide a new and improved approach for enabling an increased high-frequency and/or radio-frequency tuning range by a reduced complexity and board space even with regard to multiband and/or multistandard purposes, in particular suitable within the radio design for mobile communication systems and/or networks, preferably by simultaneously reducing the undesirable parasitic influences. The invention proposes a device for high-frequency and/or radio-frequency tuning comprising within one IC-package a first variable capacitor (C1) and at least one second capacitor (C2), each of the at least one second capacitor (C2) being fixed or variable respectively, at least one signal path connected to the first variable capacitor (C1) and providing at least one input and one output port (rf-port1, rf-port2) and at least one controllable switching means (SC2) for individually connecting and disconnecting at least one of the at least one second capacitor (C2) into the signal path or from the signal path, in particular in parallel to the first variable capacitor (C1).},
    author = {Eckl, Wolfgang and Fischer, Georg and Kaminski, Gerd},
    cris = {eckl_patent_2012},
    year = {2012},
    month = {02},
    day = {17},
    number = {EP1383234A1},
    title = {Varactor with extended tuning range},
    type = {patent},
    url = {http://ip.com/pat/EP1383234A1},
    }
  • G. Fischer and F. Pivit, A compact multiple-band antenna arrangement, 2012. [Bibtex]
    @patent{fischer_patent_2012b,
    abstract = {An antenna element is provided which is responsive in multiple frequency bands, has symmetric beam patterns, and is easily and cheaply fabricated. The antenna element includes at least three conductive plates (50,60,70;90,100,110;140,150,160;170,180,190,200) arranged in a stack. At least one pair of adjacent plates contain apertures that are mutually aligned relative to the stacking direction. The antenna element further includes at least one air stripline (80;120,130;210,220) arranged to create radiative electromagnetic excitations of the apertures when the stripline or striplines are energized by a suitable radiofrequency voltage source or sources.},
    author = {Fischer, Georg and Pivit, Florian},
    cris = {fischer_patent_2012b},
    year = {2012},
    month = {02},
    day = {17},
    number = {EP1521332A1},
    title = {A compact multiple-band antenna arrangement},
    type = {patent},
    url = {http://ip.com/pat/EP1521332A1},
    }
  • G. Fischer, G. Kaminski, and W. Eckl, Controlling Q-factors of filters, 2008. [Bibtex]
    @patent{fischer_patent_2008,
    abstract = {The present invention provides a method and an apparatus for controlling a Q-factor for a filter. The method comprises stabilizing an active feedback to provide a variable feedback in a filter, varying the active feedback based on an input signal to the filter, and producing a desired Q-factor for the filter at a first frequency band, in response to the variable feedback. The method further comprises reconfiguring a center frequency and a bandwidth of the filter based on a channel bandwidth of the input signal to the filter to adjust the Q-factor for the filter in response to a second frequency band different than the first frequency band. By reconfiguring a center frequency and a bandwidth of a filter, the Q-factor for the filter, such as a flexible or reconfigurable filter, may be controlled across a multiplicity of frequency band signals. Using software, for example, a common signal path may be provided for the multiplicity of frequency band signals within a frequency agile radio...},
    author = {Fischer, Georg and Kaminski, Gerd and Eckl, Wolfgang},
    cris = {fischer_patent_2008},
    year = {2008},
    month = {10},
    day = {07},
    keywords = {Q-factor,filter},
    number = {US7433668},
    title = {Controlling Q-factors of filters},
    type = {patent},
    url = {http://ip.com/pat/US7433668},
    }
  • G. Fischer, A method for transmission and reception in FDD mode or in TDD mode in an antenna network, an antenna network, a base station, a mobile station and a communication network therefor, 2007. [Bibtex]
    @patent{fischer_patent_2007d,
    author = {Fischer, Georg},
    cris = {fischer_patent_2007d},
    year = {2007},
    month = {12},
    day = {19},
    number = {EP2073394A1},
    title = {A method for transmission and reception in FDD mode or in TDD mode in an antenna network, an antenna network, a base station, a mobile station and a communication network therefor},
    type = {patent},
    url = {http://ip.com/pat/EP2073394A1},
    }
  • G. Fischer and J. A. Hüttner, Simplified current switched circuit topology for switch mode power amplifiers, 2007. [Bibtex]
    @patent{fischer_patent_2007c,
    author = {Fischer, Georg and Hüttner, Jörg Alexander},
    cris = {fischer_patent_2007c},
    year = {2007},
    month = {12},
    day = {18},
    number = {EP2100374B1},
    title = {Simplified current switched circuit topology for switch mode power amplifiers},
    type = {patent},
    url = {http://ip.com/pat/EP2100374B1},
    }
  • G. Fischer, Basestation RF architecture using decentralized duplexers, 2007. [Bibtex]
    @patent{fischer_patent_2007b,
    author = {Fischer, Georg},
    cris = {fischer_patent_2007b},
    year = {2007},
    month = {12},
    day = {14},
    number = {EP2100382B1},
    title = {Basestation RF architecture using decentralized duplexers},
    type = {patent},
    url = {http://ip.com/pat/EP2100382B1},
    }
  • G. Fischer, Coaxial metamaterial structure, 2007. [Bibtex]
    @patent{fischer_patent_2007a,
    author = {Fischer, Georg},
    cris = {fischer_patent_2007a},
    year = {2007},
    month = {12},
    day = {14},
    number = {EP2127017B1},
    title = {Coaxial metamaterial structure},
    type = {patent},
    url = {http://ip.com/pat/EP2127017B1},
    }
  • G. Fischer, A method for signal amplification, a current switched power amplifier system, a base station, a mobile station and a communication network therefor, 2007. [Bibtex]
    @patent{fischer_patent_2007e,
    author = {Fischer, Georg},
    cris = {fischer_patent_2007e},
    year = {2007},
    month = {12},
    day = {19},
    number = {EP2073382B1},
    title = {A method for signal amplification, a current switched power amplifier system, a base station, a mobile station and a communication network therefor},
    type = {patent},
    url = {http://ip.com/pat/EP2073382B1},
    }
  • G. Fischer, A switching signal generator, 2007. [Bibtex]
    @patent{fischer_patent_2007,
    author = {Fischer, Georg},
    cris = {fischer_patent_2007},
    year = {2007},
    month = {11},
    day = {26},
    number = {EP2063536A1},
    title = {A switching signal generator},
    type = {patent},
    url = {http://ip.com/pat/EP2063536A1},
    }
  • F. Pivit, J. Hesselbarth, G. Fischer, and S. Chalermwisutkul, Radio Frequency Transmitter (Method of efficiency improvement for switch mode power amplifiers by input signal interleaving), 2007. [Bibtex]
    @patent{pivit_patent_2007,
    author = {Pivit, Florian and Hesselbarth, Jan and Fischer, Georg and Chalermwisutkul, Suramate},
    cris = {pivit_patent_2007},
    year = {2007},
    number = {EP2058993B1},
    title = {Radio Frequency Transmitter (Method of efficiency improvement for switch mode power amplifiers by input signal interleaving)},
    type = {patent},
    url = {http://ip.com/pat/EP2058993B1},
    }
  • G. Fischer and V. Riemann, Transmitter device having a modulation closed loop, 2006. [Bibtex]
    @patent{fischer_patent_2006b,
    author = {Fischer, Georg and Riemann, V.},
    cris = {fischer_patent_2006b},
    year = {2006},
    month = {08},
    day = {02},
    keywords = {Transmitter,Modulation},
    number = {EP1128626A1},
    title = {Transmitter device having a modulation closed loop},
    type = {patent},
    url = {http://ip.com/pat/EP1128626A1},
    }
  • G. Fischer and F. Obernosterer, Radio System, Antenna arrangement and polarization modulator for generating a transmit signal with changing polarization, 2006. [Bibtex]
    @patent{fischer_patent_2006,
    abstract = {Improved frequency utilization in a radio network is achieved by using a radio system with a plurality of base stations, which respectively have at least one transmitter and one receiver, each base station being assigned at least one dual-polarized antenna. More efficient utilization of the available frequency band, and consequently a reduction in the cluster size, is made possible by the dual-polarized antenna being assigned a polarization modulator for changing at predetermined points in time the polarization state of a transmit signal to be transmitted.},
    author = {Fischer, Georg and Obernosterer, Frank},
    cris = {fischer_patent_2006},
    year = {2006},
    month = {02},
    day = {21},
    keywords = {Radio system,antenna,transmit signal,polarization},
    number = {US7003323},
    title = {Radio System, Antenna arrangement and polarization modulator for generating a transmit signal with changing polarization},
    type = {patent},
    url = {http://ip.com/pat/US7003323},
    }
  • G. Fischer, Method of analysing a receiver and/or transmitter chain, 2005. [Bibtex]
    @patent{fischer_patent_2005b,
    author = {Fischer, Georg},
    cris = {fischer_patent_2005b},
    year = {2005},
    month = {06},
    day = {08},
    number = {EP1521378B1},
    title = {Method of analysing a receiver and/or transmitter chain},
    type = {patent},
    url = {http://ip.com/pat/EP1521378B1},
    }
  • W. Eckl, G. Fischer, and B. Friedel, Base station for a wireless telecommunication system, 2005. [Bibtex]
    @patent{eckl_patent_2005a,
    abstract = {The invention relates to a base station for a wireless telecommunications system, in particular for a CDMA system or network. It is an object to provide a base station and amplifier arrangement for a base station with high efficiency and/or low power consumption, which can be flexibly adapted to fluctuations in RF transmission power requested. According to the invention, a base station is provided, comprising an amplifier arrangement for amplifying signals transmitted by the base station, wherein said amplifier arrangement comprises two or more parallel amplifier branches with different maximum output power.},
    author = {Eckl, Wolfgang and Fischer, Georg and Friedel, Bernd},
    cris = {eckl_patent_2005a},
    year = {2005},
    month = {04},
    day = {06},
    number = {EP1521376B1},
    title = {Base station for a wireless telecommunication system},
    type = {patent},
    url = {http://ip.com/pat/EP1521376B1},
    }
  • W. Eckl, G. Fischer, and B. Friedel, Parallel amplifier arrangement, 2005. [Bibtex]
    @patent{eckl_patent_2005,
    abstract = {An amplifier arrangement comprising signal input means (3), a first amplifying device (1), at least a second amplifying device (2), and a signal output means (4). The signal input means (3) splits and/or conditions any incoming signal into at least a first branch (11) and a second branch (12), and includes at least one reconfigurable circuit (31, 32, 36) to said first and second amplifying devices (1, 2). The said signal output means (4) combines any signal output and includes at least one reconfigurable circuit (33, 34, 35). Furthermore, control means (5) for said reconfigurable circuits (31 through 36) is provided for controlling said reconfigurable circuits individually and independently from one another.},
    author = {Eckl, Wolfgang and Fischer, Georg and Friedel, Bernd},
    cris = {eckl_patent_2005},
    year = {2005},
    month = {04},
    day = {06},
    number = {EP 1521360 A1},
    title = {Parallel amplifier arrangement},
    type = {patent},
    url = {http://ip.com/pat/EP1521360A1},
    }
  • M. Doubrava and G. Fischer, Modular amplifier arrangement, 2005. [Bibtex]
    @patent{doubrava_patent_2005,
    abstract = {The invention relates to a modular RF power amplifier arrangement for a base station for a wireless communication system. It is an object to provide a modular amplifier arrangement which is upgradeable multiply in a fail-safe manner to increase its output power capabilities in a cost-efficient manner, with low losses, high efficiency. According to the invention a modular traveling wave amplifier is proposed comprising a basic amplifier module (100) with an input line arrangement (110) and an output line arrangement (120), at least a first branching line (136) for parallely connecting a first upgrade amplifier module (200), and variable or reconfigurable impedance matching means at the input and/or at the output.},
    author = {Doubrava, M. and Fischer, Georg},
    cris = {doubrava_patent_2005},
    year = {2005},
    month = {04},
    day = {06},
    number = {EP1521361A1},
    title = {Modular amplifier arrangement},
    type = {patent},
    url = {http://ip.com/pat/EP1521361A1},
    }
  • G. Fischer, Shaping noise in Power Amplifiers of Duplex Communication Systems, 2005. [Bibtex]
    @patent{fischer_patent_2005a,
    abstract = {The present invention provides a method and an apparatus for reducing radio frequency noise within a duplex communication system. The method comprises sensing a radio frequency transmit signal capable of operating a power amplifier that is capable of operation at a microwave transmit frequency and using a filter to cause an asymmetric notch in a noise power density spectrum in a radio frequency output signal to shape the noise power density spectrum at a low radio frequency power level in the microwave transmit frequency in response to the radio frequency transmit signal. In a base station, a duplex filter arrangement may trim the wideband noise within a power amplifier, such as a Class-S power amplifier. An increased filtering effort may be spend at a low power level at a power amplifier input. A desired noise shaping may be applied in the power amplifier to prevent desensitization of a receiver of a base station by the wideband noise at one or more receive frequencies for a digital cellular network in a telecommunication system. Use of a noise shaping filter with an asymmetric shape response may attenuate noise on a lower side of a transmit frequency and increase the noise on a higher side of the transmit frequency. A shift of the noise power to desired frequency regions, enables the base station to tolerate relatively more noise at higher frequencies than in a receive band, at frequencies that are lower than a transmit band. As a result, a Class-S power amplifier may provide both high linearity and efficiency.},
    author = {Fischer, Georg},
    cris = {fischer_patent_2005a},
    year = {2005},
    month = {03},
    day = {22},
    number = {US20060217082A},
    title = {Shaping noise in Power Amplifiers of Duplex Communication Systems},
    type = {patent},
    url = {http://ip.com/pat/US20060217082},
    }
  • G. Fischer, A Tunable Radio Frequency Filter, 2005. [Bibtex]
    @patent{fischer_patent_2005,
    abstract = {The present invention provides a filter unit cell. The filter unit cell includes a variable capacitor coupled in series between first and second nodes and an inductor coupled in series between the second node and a third node.},
    author = {Fischer, Georg},
    cris = {fischer_patent_2005},
    year = {2005},
    month = {02},
    day = {10},
    number = {EP1691482A1},
    title = {A Tunable Radio Frequency Filter},
    type = {patent},
    url = {http://ip.com/pat/EP1691482A1},
    }
  • W. Eckl, G. Fischer, and G. Kaminski, Reconfigurable multibandfilter, 2004. [Bibtex]
    @patent{eckl_patent_2004,
    abstract = {The invention relates to a re-configurable filter. An object of the invention is, to provide a new and improved approach for providing an increased reconfiguration flexibility with regard to a filter, in particular to a bandpass-filter for different high-frequency or radio-frequency bands, in particular suitable for use within the transceiver of base stations and/or user terminals, such as handsets adapted to be used within these communication systems, by preferably simultaneously reducing undesirable parasitic influences. The invention proposes a reconfigurable multibandfilter, in particular adapted for filtering high-frequency and/or radio-frequency comprising at least two filters (f1, f2, f3) connected at their input ports in parallel (1) into a signal path, and at least one controllable switching means for individually connecting (2) respectively one of the filter output ports into said signal path with the other filter output ports disconnected from said signal path and in particular connected to ground (3).},
    author = {Eckl, Wolfgang and Fischer, Georg and Kaminski, Gerd},
    cris = {eckl_patent_2004},
    year = {2004},
    month = {01},
    day = {21},
    number = {EP1383236A1},
    title = {Reconfigurable multibandfilter},
    type = {patent},
    url = {http://ip.com/pat/EP1383236A1},
    }
  • K. Schmitt and G. Fischer, Method and system for monitoring a radio transmission link, 2003. [Bibtex]
    @patent{schmitt_patent_2003,
    abstract = {A radio transmission link between at least one radio transmission device is monitored and at least one radio reception device. Radio transmission links between at least one transmission antenna and one reception antenna are monitored for faults. At least one radio reception device is tuned to the transmission frequency of at least one radio transmission device. The at least one radio transmission device then transmits, during a predetermined time period, a predetermined test signal which is recorded, evaluated and stored as a reference signal in the at least one radio reception device during a predetermined time period. At the start of a test phase, at least one radio transmission device transmits the predetermined test signal. The test signal is compared with the stored reference signal, and an error signal is produced if the comparison result shows that the test signal has changed beyond a predetermined extent with respect to the stored reference signal.},
    author = {Schmitt, K. and Fischer, Georg},
    cris = {schmitt_patent_2003},
    year = {2003},
    month = {12},
    day = {23},
    keywords = {monitoring,radio transmission link},
    number = {US6668160},
    title = {Method and system for monitoring a radio transmission link},
    type = {patent},
    url = {http://ip.com/pat/US6668160},
    }
  • W. Eckl, G. Fischer, and G. Kaminski, Universal tuning and matching device, 2003. [Bibtex]
    @patent{eckl_patent_2003a,
    abstract = {The invention relates to an universal tuning and matching device. An object of the invention is to provide a new and improved approach for providing an increased reconfiguration flexibility for high frequency or radio frequency signal transmission systems and/or applications by simultaneously reducing undesirable parasitic influences. The invention proposes a device for high frequency tuning and/or matching incorporating within one IC-package at least two capacitors (C1, C2, C3) and two inductors (L1, L2, L3), at least one signal path with at least one input and one output port (rf-port1, rf-port2, rf-prot3) and controllable switching means (1C1, 1C2, 1C3, 1L1, 1L2, 1L3) for individually connecting and disconnecting at least one of the capacitors (C1, C2, C3) and/or at least of the inductors (L1, L2, L3) into the signal path or from the signal path.},
    author = {Eckl, Wolfgang and Fischer, Georg and Kaminski, Gerd},
    cris = {eckl_patent_2003a},
    year = {2003},
    month = {11},
    day = {26},
    number = {EP1365507A1},
    title = {Universal tuning and matching device},
    type = {patent},
    url = {http://ip.com/pat/EP1365507A1},
    }
  • G. Fischer and K. Ritter, Power amplifier with an adjustable quiescent current, 2003. [Bibtex]
    @patent{fischer_patent_2003b,
    abstract = {A transmitting apparatus, in particular for a mobile radio base station, is provided. The apparatus includes at least one power amplifier (10) which has at least one amplifier element (80) and one device (20, 90, 100) for forcing a quiescent current to flow into the amplifier element (80). The level of the quiescent current can be varied in dependance of the operating state of the transmitting apparatus.},
    author = {Fischer, Georg and Ritter, Kai-Uwe},
    cris = {fischer_patent_2003b},
    year = {2003},
    month = {09},
    day = {03},
    number = {EP1341300A1},
    title = {Power amplifier with an adjustable quiescent current},
    type = {patent},
    url = {http://ip.com/pat/EP1341300A1},
    }
  • W. Eckl, G. Fischer, and G. Kaminski, Tunable negative resistance device, 2003. [Bibtex]
    @patent{eckl_patent_2003,
    abstract = {The invention proposes a device for providing tunable high-frequency and/or radio-frequency comprising within one IC-package at least four signal paths providing at least two input and at least two output ports (rf-port1, rf-port2, rf-prot3, rf-port4) at least one active component (T) and at least one variable passive component (C1, C2) connected at least with an input port of the active component (T), and at least one control path for controllable tuning the at least one variable passive component (C1, C2).},
    author = {Eckl, Wolfgang and Fischer, Georg and Kaminski, Gerd},
    cris = {eckl_patent_2003},
    year = {2003},
    month = {06},
    number = {US6894573},
    title = {Tunable negative resistance device},
    type = {patent},
    url = {http://ip.com/pat/US6894573},
    }
  • G. Fischer, Antenna hopping sequence for TX diversity in wireless telecommunication systems, 2003. [Bibtex]
    @patent{fischer_patent_2003a,
    abstract = {The invention proposes for improving the overall spectral efficiency of wireless telecommunication systems, in particular of mobile communication systems, the transmission of at least one multiframe signal having a plurality of sub-frames with predefined logical channels (BCCH, FCCH, SCH) repeatedly embedded in predefined sub-frames, wherein a transmitter diversity is applied using antenna and/or polarisation hopping sequences such that during the transmission of respective one multiframe, each logical channel (BCCH, FCCH, SCH) is transmitted at least two times with a different antenna and/or polarisation.},
    author = {Fischer, Georg},
    cris = {fischer_patent_2003a},
    year = {2003},
    month = {04},
    day = {17},
    number = {US20030072293},
    title = {Antenna hopping sequence for TX diversity in wireless telecommunication systems},
    type = {patent},
    url = {http://ip.com/pat/US20030072293},
    }
  • G. Fischer, IMPROVED ANTENNA HOPPING SEQUENCE FOR TX DIVERSITY IN WIRELESS TELECOMMUNICATION SYSTEM, 2003. [Bibtex]
    @patent{fischer_patent_2003,
    abstract = {PROBLEM TO BE SOLVED: To provide an improved antenna hopping sequence for TX diversity in a wireless telecommunication system. Ž

    SOLUTION: In the overall spectrum efficiency of the wireless telecommunication system, at least one multiframe signal having a plurality of sub-frames in which predefined logic channels (BCCH, FCCH and SCH) are repeatedly embedded in the predefined sub-frame is transmitted and a transmitter diversity is applied using an antenna and/or polarization hopping sequences to transmit each of the logic channels (BCCH, FCCH and SCH) at least twice by using different antennas and/or polarized waves during the transmission of one multiframe. Thus, the total spectrum efficiency of the wireless telecommunication system, in particular of a mobile communication system, is improved. Ž

    COPYRIGHT: (C)2003,JPO Ž}, author = {Fischer, Georg}, cris = {fischer_patent_2003}, year = {2003}, month = {04}, day = {04}, number = {JP2003188782A}, title = {IMPROVED ANTENNA HOPPING SEQUENCE FOR TX DIVERSITY IN WIRELESS TELECOMMUNICATION SYSTEM}, type = {patent}, url = {http://ip.com/pat/JP2003188782A}, }

  • G. Fischer and K. Ritter, Phase shift keying (PSK) modulator capable of reducing the peak to average power ratio, 2002. [Bibtex]
    @patent{fischer_patent_2002a,
    abstract = {An apparatus for transmitting multistage phase shift keying signals comprising a symbol stream, interpolation and pulse shaping means (4), and digital-to-analog converting means (5) for providing an analog base band transmit signal. A displacing means (3) for producing displaced symbols from the symbol stream is arranged at the input of the interpolation and pulse shaping means (4) and includes detecting means (14 ... 17) for detecting predetermined symbol sequences in the symbol stream. If such symbol sequences are detected, displaced symbols (S3', S3") are produced with a view to avoid peak power at the analog base band transmit signal or to avoid crossing near zero power.},
    author = {Fischer, Georg and Ritter, Kai-Uwe},
    cris = {fischer_patent_2002a},
    year = {2002},
    month = {10},
    number = {EP1253757A1},
    title = {Phase shift keying (PSK) modulator capable of reducing the peak to average power ratio},
    type = {patent},
    url = {http://ip.com/pat/EP1253757A1},
    }
  • G. Fischer and K. Ritter, Transmitter/receiver device with re-configurable output combining, 2002. [Bibtex]
    @patent{fischer_patent_2002b,
    abstract = {The invention relates to transmission devices for a transmission system, especially for mobile radio system, comprising at least two transmission units each of which having a transmission branch (1, 2) with a signal generating chain (11, 21) and signal amplifying chain (12, 13, 14, 22, 23) wherein the outputs of the signal amplifying chains are connected to a hybrid-combiner (30). An object of the invention is to provide an improved transmitting device, in particular, to reduce the amount of components to be used by simultaneously providing a significant increase of effectiveness. The invention proposes to provide such a transmission device with means for connecting (34, 35a, 35b, 35c) each output port (30a, 30b) of the hybrid-combiner to a separate antenna. An advantage of such inventive solution is based on the fact that the components necessary to realize a transmission device, that is flexible in particular with regard to mutually combined carriers for transmitting with high.},
    author = {Fischer, Georg and Ritter, Kai-Uwe},
    cris = {fischer_patent_2002b},
    year = {2002},
    month = {10},
    number = {US20020155863},
    title = {Transmitter/receiver device with re-configurable output combining},
    type = {patent},
    url = {http://ip.com/pat/US20020155863},
    }
  • G. Fischer, Method and device for adapting transmission power levels in transmission systems, 2002. [Bibtex]
    @patent{fischer_patent_2002,
    author = {Fischer, Georg},
    cris = {fischer_patent_2002},
    year = {2002},
    month = {05},
    number = {EP1202448B1},
    title = {Method and device for adapting transmission power levels in transmission systems},
    type = {patent},
    url = {http://ip.com/pat/EP1202448B1},
    }
  • G. Fischer, L. T. Manzione, and M. Tsai, Antenna structure for electromagnetic structures, 2001. [Bibtex]
    @patent{fischer_patent_2001b,
    abstract = {Disclosed is an antenna structure for transmitting and receiving electromagnetic signals, in particular for mobile telecommunication using the GSM Standard. The antenna structure allows for decoupling between the transmission path and reception path. The antenna structure has two preferably perpendicular couplings with two separate ports, for example for the connection of a transmitting device and a receiving device. Furthermore, the impedances of the two couplings can advantageously be matched, independently of one another, to the transmitting device and receiving device and/or the frequency bands of the signals to be transmitted or received.},
    author = {Fischer, Georg and Manzione, Louis Thomas and Tsai, Ming-Ju},
    cris = {fischer_patent_2001b},
    year = {2001},
    month = {12},
    number = {EP1160917A1},
    title = {Antenna structure for electromagnetic structures},
    type = {patent},
    url = {http://ip.com/pat/EP1160917A1},
    }
  • G. Fischer, Fast power control in wireless communication network, 2001. [Bibtex]
    @patent{fischer_patent_2001a,
    abstract = {The invention relates to the controlling of transmission power of a wireless communication network, and in particular to the controlling of transmission power in the downlink direction of a GSM-network. An object of the present invention is, to provide a new and improved approach, in particular for enhancing the spectral efficiency, by realizing a fast controlling of transmission power substantially independent of any upcoming addition to a standard relating to wireless communication networks to ensure a transmission power control that is immediately available and compatible to already existing mobile stations. The invention proposes for the controlling of the transmission power the steps of receiving at a base station an uplink signal transmitted by a user equipment, detecting at least one kind of information parameter from said uplink signal during definable time periods, comparing the information parameters detected during a respective time period with each other and periodically adjusting the downlink transmission power between said base station and said user equipment in dependence on the comparison for providing a fast power control loop between said base station and said user equipment to reduce varying fading effects.},
    author = {Fischer, Georg},
    cris = {fischer_patent_2001a},
    year = {2001},
    month = {09},
    day = {24},
    keywords = {power control,wireless communication},
    number = {EP1296464A1},
    title = {Fast power control in wireless communication network},
    type = {patent},
    url = {http://ip.com/pat/EP1296464A1},
    }
  • G. Fischer and F. Obernosterer, Radio system, antenna arrangement and polarization modulator for generating a transmit signal with changing polarization, 2001. [Bibtex]
    @patent{fischer_patent_2006a,
    abstract = {Improved frequency utilization in a radio network is achieved by using a radio system with a plurality of base stations, which respectively have at least one transmitter and one receiver, each base station being assigned at least one dual-polarized antenna. More efficient utilization of the available frequency band, and consequently a reduction in the cluster size, is made possible by the dual-polarized antenna being assigned a polarization modulator for changing at predetermined points in time the polarization state of a transmit signal to be transmitted.},
    author = {Fischer, Georg and Obernosterer, Frank},
    cris = {fischer_patent_2006a},
    year = {2001},
    month = {09},
    day = {07},
    number = {US20020034968A1},
    title = {Radio system, antenna arrangement and polarization modulator for generating a transmit signal with changing polarization},
    type = {patent},
    url = {http://ip.com/pat/US20020034968},
    }
  • G. Fischer and K. Schmitt, Process and apparatus for the automatic detection of a faulty cabling in radio communication equipments, 2001. [Bibtex]
    @patent{fischer_patent_2001,
    abstract = {The invention relates to a process for the automatic detection of the allocation of at least one transmitting device and/or receiving device to a transmitting and/or receiving antenna of a radio communication equipment, which has at least one transmitting device and/or receiving device (1, 2..m1, 1, 2..m2, 1, 2..mn) and at least one transmitting and/or receiving antenna (701, 702..70n; 751, 752..75n). For this purpose, at least one transmitting device and/or receiving device is first allocated to each transmitting antenna and/or receiving antenna. A predetermined transmitting device and/or receiving device is then activated, and a signal or noise is fed into the radio communication equipment. The signal or noise is evaluated in at least one detector device (1, 2..m1, 1, 2..m2, 1, 2..mn; 501, 502..50n), which is arranged at a predetermined place of the radio communication equipment. An allocation of the activated transmitting device and/or receiving device to one of the transmitting antennas and/or receiving antennas is ascertained in dependence on the evaluated signal or noise level.},
    author = {Fischer, Georg and Schmitt, K.},
    cris = {fischer_patent_2001},
    year = {2001},
    month = {02},
    day = {21},
    number = {EP1077546A1},
    title = {Process and apparatus for the automatic detection of a faulty cabling in radio communication equipments},
    type = {patent},
    url = {http://ip.com/pat/EP1077546A1},
    }
  • G. Fischer, Single element antenna structure with high isolation, 2000. [Bibtex]
    @patent{fischer_patent_2000,
    abstract = {Disclosed is an antenna structure for transmitting and receiving electromagnetic signals, in particular for mobile telecommunication using the GSM Standard. The antenna structure allows for decoupling between the transmission path and reception path. The antenna structure has two preferably perpendicular couplings with two separate ports, for example for the connection of a transmitting device and a receiving device. Furthermore, the impedances of the two couplings can advantageously be matched, independently of one another, to the transmitting device and receiving device and/or the frequency bands of the signals to be transmitted or received.},
    author = {Fischer, Georg},
    cris = {fischer_patent_2000},
    year = {2000},
    month = {05},
    day = {31},
    keywords = {antenna,isolation},
    number = {US6288679},
    title = {Single element antenna structure with high isolation},
    type = {patent},
    url = {http://ip.com/pat/US6288679},
    }
  • G. Fischer and K. Ritter, Schaltungsanordnung zur Digital-Analog-Wandlung, 2000. [Bibtex]
    @patent{fischer_patent_2000a,
    abstract = {The invention relates to a circuit arrangement (10) for digital-to-analog conversion of a data stream. Ever faster digital-to-analog converters with high resolution are demanded nowadays for the digital-to-analog conversion of a data stream. In order to be able to realize both performance features in a cost-effective circuit arrangement, provision is made of a device (20) for splitting the data stream into at least two data streams with a clock rate of 1/(Tin/n) in each case, where n is greater than or equal to 2. Furthermore, provision is made of at least two digital-to-analog converters (30, 35; 80, 82, 84, 86) for converting a respective one of the partial data streams with a conversion clock rate of 1/(Tin/n) and, furthermore, of a device (40; 50) for combining the converted partial data streams.},
    author = {Fischer, Georg and Ritter, Kai-Uwe},
    cris = {fischer_patent_2000a},
    year = {2000},
    month = {05},
    day = {31},
    number = {EP1160986A1},
    title = {Schaltungsanordnung zur Digital-Analog-Wandlung},
    type = {patent},
    url = {http://ip.com/pat/EP1160986A1},
    }
  • F. Bode, F. Koertje, M. Barkow, and G. Fischer, Aerial arrangement for attaching a planar aerial to the inside of a vehicle window, 1996. [Bibtex]
    @patent{bode_patent_1996,
    abstract = {The invention relates to an aerial arrangement for attaching a planar aerial to the inside of a vehicle window for the purpose of radio communication between a vehicle unit and a transmitter and or receiver outside the vehicle, in particular on frequencies in the GHz range. The directivity of the aerial is affected, by inserting an intermediate dielectric member with a dielectric constant between the larger radiation or reception angle. The distance between the pane and the aerial is also advantageously reduced.},
    author = {Bode, Friedrich-Wilhelm and Koertje, Frank and Barkow, Matthias and Fischer, Georg},
    cris = {bode_patent_1996},
    year = {1996},
    month = {12},
    day = {12},
    number = {WO1997035354A1},
    title = {Aerial arrangement for attaching a planar aerial to the inside of a vehicle window},
    type = {patent},
    url = {http://ip.com/pat/WO1997035354A1},
    }
  • G. Fischer and T. Eibeck, Phasengesteuerte zweidimensionale Gruppenantenne als teiladaptives Empfangssystem für den Satellitenrundfunk mit elektronischer Beeinflussung der Richtcharakteristik und der Polarisation, 1995. [Bibtex]
    @patent{fischer_patent_1995,
    abstract = {Technisches Problem der Erfindung, technische Aufgabe und Zielsetzung DOLLAR A Übliche zweidimensionale Gruppenantennen, bei denen die Hauptempfangsrichtung fest senkrecht zur Antennenfläche zeigt, müssen mechanisch ausgerichtet werden. Dies führt beim Satellitenempfang dazu, daß die Antenne bei Montage an einer Hauswand von der Wand absteht, was sich negativ auf das Erscheinungsbild auswirkt. DOLLAR A Die neue phasengesteuerte Gruppenantenne erlaubt nun die Montage flach an einer grob zu dem gewünschten Satelliten ausgerichteten Hauswand und eine automatische Anpassung der Richtcharakteristik und der Polarisation. DOLLAR A Lösung des Problems bzw. der technischen Aufgabe DOLLAR A Durch die Vorprägung der Richtcharakteristik der seriell gespeisten Elemente einer Spalte wird die starke Neigung in Elevationsrichtung vermieden. Die Anpassung an den Azimutwinkel erfolgt durch Phasengewichtung der Signale der Spalten. Die Anpassung der Polarisation erfolgt durch Überlagerung orthogonal polarisierter Anteile benachbarter Spalten. Hierdurch wirken sich die Phasengewichte der Spaltensignale sowohl auf die Richtcharakteristik als auch auf die vom Einfallswinkel abhängige Polarisation aus. DOLLAR A Anwendunggebiet DOLLAR A Die phasengesteuerte Gruppenantenne eignet sich für den stationären als auch mobilen Empfang von Wellen beliebiger Polarisation auch bei Mehrwegeausbreitung.},
    author = {Fischer, Georg and Eibeck, T.},
    cris = {fischer_patent_1995},
    year = {1995},
    month = {08},
    day = {25},
    keywords = {Satellitenempfang,Satellitenantenne,Array,Richtcharakteristik},
    number = {DE19531309C2},
    title = {Phasengesteuerte zweidimensionale Gruppenantenne als teiladaptives Empfangssystem für den Satellitenrundfunk mit elektronischer Beeinflussung der Richtcharakteristik und der Polarisation},
    type = {patent},
    url = {http://ip.com/pat/DE19531309C2},
    }

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Publikationen

2017

  • V. A. Silva Cortes, L. Liu, U. Stehr, M. Fischer, A. Frank, V. Chauhan, M. Hein, J. Müller, R. Weigel, G. Fischer, and A. Hagelauer, "Design of a Power Amplifier Module in a Novel Silicon-Ceramic Substrate for an LTE Transmitter" in Asia Pacific Microwave Conference, , Malaysia, 2017, p. 4. [Bibtex]
    @inproceedings{silva2017,
    abstract = {The present paper demonstrates the design of a power amplifier (PA) module on a silicon ceramic (SiCer) composite substrate. The SiCer platform combines the advantages of low temperature co-fired ceramic (LTCC) and silicon thin-film processing technology for micro-electro-mechanical systems (MEMS) in a quasi-monolithic composite substrate. The present approach provides a methodology for the design and manufacturing of a PA module that foresees further integration with MEMS modules such as switches, oscillators, and acoustic filters. Based on a co-simulation approach in a specification-compliant software and polyharmonic distortion modeling, the impact of the PA module in a long term evolution (LTE) transmitter is evaluated.},
    author = {Silva Cortes, Victor Arturo and Liu, Lian and Stehr, Uwe and Fischer, Michael and Frank, Astrid and Chauhan, Vikrant and Hein, Matthias and Müller, Jens and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    language = {English},
    booktitle = {Asia Pacific Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1073020},
    year = {2017},
    month = {11},
    day = {13},
    eventdate = {2017-11-13/2017-11-16},
    eventtitle = {Asia Pacific Microwave Conference},
    faupublication = {yes},
    keywords = {Power amplifier; front end; composite substrate},
    pages = {4},
    peerreviewed = {Yes},
    title = {Design of a Power Amplifier Module in a Novel Silicon-Ceramic Substrate for an LTE Transmitter},
    type = {Journal Article},
    venue = {, Malaysia},
    }
  • A. El Assaad and G. Fischer, "System Archictecture for Hybrid Communication and Localization in Downlink LTE" in Hybride Kommunikations- und Ortungstechnologien für das vernetzte Fahren – Technologiestand und Ausbaupotenzial, DGON-Konvent 2017, Vertretung des Landes Sachsen-Anhalt beim Bund in Berlin, Germany, 2017. [Bibtex]
    @inproceedings{assaad2017,
    author = {El Assaad, Ahmad and Fischer, Georg},
    language = {English},
    booktitle = {Hybride Kommunikations- und Ortungstechnologien für das vernetzte Fahren – Technologiestand und Ausbaupotenzial, DGON-Konvent 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061358},
    year = {2017},
    month = {05},
    day = {04},
    eventdate = {2017-05-04/2017-05-05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {System Archictecture for Hybrid Communication and Localization in Downlink LTE},
    type = {Konferenzschrift},
    venue = {Vertretung des Landes Sachsen-Anhalt beim Bund in Berlin, Germany},
    }
  • J. Kirchner, S. Schild, and G. Fischer, "Detection of Paroxysmal Atrial Fibrillation: A Computationally Efficient Algorithm for Use in a Wearable Telemedical System" in 2017 IEEE International Sympium on Medical Measurements and Applications (MeMeA), Rochester, MN, USA, 2017. [Bibtex]
    @inproceedings{kirchner2017,
    abstract = {For early detection of the sporadic events of paroxysmal atrial fibrillation (AF), long-term ECG monitoring and data evaluation are required. To allow energy-efficient on-device preprocessing of the data, an as simple as possible algorithm is sought. The proposed approach is based on heart frequency data only and makes use of the increased heart rate variation with the occurrence of AF. Criteria for the choice of the free parameters of this method are derived, and it is shown that, under these conditions, results are insensitive against variations of these parameters. If a compromise between sensitivity and specificity is sought, i.e. equality of these values, 89.4% are obtained in average. If instead sensitivity alone is optimized, i. e. for use with additional AF detection strategies, an average value of 99.6% is reached with specificity 38.4%. The algorithm forms the first step in the development of a computationally and thus energy efficient signal processing module for the purpose of reducing the amount of data that has to be stored or transmitted and then evaluated by the treating physician.},
    author = {Kirchner, Jens and Schild, Stefanie and Fischer, Georg},
    language = {English},
    booktitle = {2017 IEEE International Sympium on Medical Measurements and Applications (MeMeA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1066930},
    year = {2017},
    month = {05},
    day = {07},
    eventdate = {2017-05-07/2017-05-10},
    faupublication = {yes},
    keywords = {Paroxysmales Vorhofflimmern; Elektrokardiogram; Herzratenvariabilität; Herzkrankheit},
    peerreviewed = {Yes},
    title = {Detection of Paroxysmal Atrial Fibrillation: A Computationally Efficient Algorithm for Use in a Wearable Telemedical System},
    type = {Konferenzschrift},
    venue = {Rochester, MN, USA},
    }
  • [DOI] L. Zimmermann, A. Götz, G. Fischer, and R. Weigel, "Performance Analysis of Time Difference of Arrival and Angle of Arrival Estimation Methods for GSM Mobile Phone Localization," in Communication, Signal Processing & Information Technology, De Gruyter, 2017, vol. 4, pp. 17-34. [Bibtex]
    @inbook{zimmermann2017,
    abstract = {The localization methods time difference of arrival (TDOA) and angle of arrival (AOA) are investigated in their capability of high-resolution detection of GSM signals. Because GSM is of narrowband nature, a bandwidth expansion technique that significantly increases the resolution of TDOA is introduced. The algorithms maximum likelihood estimator (for TDOA), root multiple signal classification and estimation of signal parameters via rotational invariance techniques (for AOA) are proposed as a reference for each method. Simulations conducted with noisy signals and multipath propagation demonstrate the potential of TDOA for GSM localization, especially for search and rescue applications. AOA on the other hand is very sensitive to multipath, and is therefore only recommended for open space scenarios.},
    author = {Zimmermann, Lars and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    language = {English},
    publisher = {De Gruyter},
    booktitle = {Communication, Signal Processing & Information Technology},
    cris = {https://cris.fau.de/converis/publicweb/publication/1063135},
    year = {2017},
    month = {04},
    doi = {10.1515/9783110448399-002},
    faupublication = {yes},
    isbn = {9783110448399},
    issn = {2365-7493},
    journaltitle = {Advances in systems, signals and devices},
    keywords = {Time difference of arrival estimation; Direction of arrival estimation; GSM; Maximum likelihood estimation; Multiple signal classification; Estimation of signal parameters via rotational invariance techniques},
    pages = {17--34},
    peerreviewed = {unknown},
    series = {Advances in Systems, Signals and Devices},
    title = {Performance Analysis of Time Difference of Arrival and Angle of Arrival Estimation Methods for GSM Mobile Phone Localization},
    type = {Buchkapitel},
    volume = {4},
    }
  • [DOI] Y. Can and G. Fischer, "Extended Forms of Switching Functions" in 4th International Conference on Electrical and Electronics Engineering (ICEEE), Ankara, Turkey, 2017. [Bibtex]
    @inproceedings{can2017,
    author = {Can, Yavuz and Fischer, Georg},
    language = {English},
    booktitle = {4th International Conference on Electrical and Electronics Engineering (ICEEE)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1062002},
    year = {2017},
    month = {04},
    day = {08},
    doi = {10.1109/ICEEE2.2017.7935793},
    eventdate = {2017-04-08/2017-04-10},
    faupublication = {yes},
    keywords = {Orthogonalizing; Normal Forms},
    peerreviewed = {Yes},
    title = {Extended Forms of Switching Functions},
    venue = {Ankara, Turkey},
    }
  • Y. Can and G. Fischer, "Applications of the new Method of Orthogonalizing Difference-Building", Discrete Mathematics and Applications, 2017. [Bibtex]
    @article{can2017b,
    author = {Can, Yavuz and Fischer, Georg},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061998},
    year = {2017},
    month = {03},
    day = {24},
    faupublication = {yes},
    issn = {0924-9265},
    journaltitle = {Discrete Mathematics and Applications},
    keywords = {ANF; DNF; KNF; Orthogonalization},
    peerreviewed = {Yes},
    title = {Applications of the new Method of Orthogonalizing Difference-Building},
    }
  • [DOI] L. Zimmermann, R. Weigel, and G. Fischer, "Fusion of Non-Intrusive Environmental Sensors for Occupancy Detection in Smart Homes", IEEE Internet of Things, 2017. [Bibtex]
    @article{zimmermann2017a,
    abstract = {We presented an approach to detect and count occupants using a fusion of environmental sensors from an indoor air quality measurement system. Environmental sensors, as opposed to motion detectors, are non-intrusive, easy to install, low cost, detect non-moving occupants, do not have dead spots, and can even infer the number of occupants. For this study, we conducted measurements of carbon dioxide, volatile organic compounds, air temperature, and air relative humidity in four student apartments for a total of 49 days. We extracted features from the environmental sensors and selected subsets using correlation-based feature selection. Subsequently, we performed a comparison of the supervised learning models RIPPER, Naı̈ve Bayes, C4.5 decision tree, Logistic Regression, k-Nearest Neighbors, and Random Forest. We further proposed a method to greatly reduce time and effort of collecting training data in residential buildings. The results indicated that the predictive power of volatile organic compound sensing is comparable to that of carbon dioxide. With a simple Naı̈ve Bayes classifier, our approach detected occupancy and estimated the number of occupants with an accuracy of 81.1 % and 64.7 %, respectively.},
    author = {Zimmermann, Lars and Weigel, Robert and Fischer, Georg},
    language = {English},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1066759},
    year = {2017},
    doi = {10.1109/JIOT.2017.2752134},
    faupublication = {yes},
    issn = {2327-4662},
    journaltitle = {IEEE Internet of Things},
    keywords = {environmental sensing,indoor air quality,occupancy detection,sensor fusion,smart homes,supervised learning,volatile organic compounds},
    peerreviewed = {Yes},
    title = {Fusion of Non-Intrusive Environmental Sensors for Occupancy Detection in Smart Homes},
    }

2016

  • V. A. Silva Cortes, R. Weigel, G. Fischer, and A. Hagelauer, "High Power Effects on a MEMS-based Tunable Matching Network for Power Amplifier Reconfigurability" in Latin America Microwave Conference 2016, Puerto Vallarta, Mexico, 2016. [Bibtex]
    @inproceedings{silva2016b,
    abstract = {In this work, the thermal effects on a tunable matching network (TMN) based on micro electro mechanical system (MEMS) are investigated. A capacitive MEMS switch acts as the active component in a TMN that provides reconfigurability on the PA architecture. However, the large signal operation of the PA causes the membrane of the MEMS switch to heat up, leading to variations of its intrinsic characteristics. These effects are modeled and their influence on the linearity of the PA addressed. The study is aided by a behavioral model of the capacitive MEMS switch with the additional modeling of the thermal effects that raise due to power dissipation at the MEMS’s membrane. The PA architecture is based on a commercial process design kit for the PA and the geometrical and material characteristics of an available MEMS switch.},
    author = {Silva Cortes, Victor Arturo and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    publisher = {IEEE MTT-S},
    booktitle = {Latin America Microwave Conference 2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060283},
    year = {2016},
    month = {12},
    day = {12},
    eventdate = {2016-12-12/2016-12-14},
    eventtitle = {Latin America Microwave Conference 2016},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {High Power Effects on a MEMS-based Tunable Matching Network for Power Amplifier Reconfigurability},
    venue = {Puerto Vallarta, Mexico},
    }
  • M. Dietz, G. A. Guarin Aristizabal, M. Hofmann, I. Nasr, J. Nehring, B. Lämmle, A. Schwarzmeier, K. Aufinger, A. Hagelauer, G. Fischer, R. Weigel, and D. Kissinger, "Wearables with integrated Microwave-Sensors for Internet-of-Things-Applications (IoT) in the sector of health-care: An overview" in VDE Kongress 2016: Internet der Dinge, Mannheim, 2016, pp. 1-6. [Bibtex]
    @inproceedings{dietz2016a,
    author = {Dietz, Marco and Guarin Aristizabal, Gustavo Adolfo and Hofmann, Maximilian and Nasr, Ismail and Nehring, Johannes and Lämmle, Benjamin and Schwarzmeier, Andre and Aufinger, Klaus and Hagelauer, Amelie and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {VDE},
    booktitle = {VDE Kongress 2016: Internet der Dinge},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060315},
    year = {2016},
    month = {11},
    day = {07},
    eventdate = {2016-11-07/2016-11-08},
    faupublication = {yes},
    pages = {1--6},
    peerreviewed = {unknown},
    title = {Wearables with integrated Microwave-Sensors for Internet-of-Things-Applications (IoT) in the sector of health-care: An overview},
    venue = {Mannheim},
    }
  • [DOI] J. Kirchner, N. Roth, A. Meyer, and G. Fischer, "ECG Measurement by Use of Passive Capacitively Coupled Electrodes" in Proc. IEEE Sensors Conf., Orlando, FL, USA, 2016. [Bibtex]
    @inproceedings{kirchner2016,
    abstract = {The prototype of a capacitive ECG measurement device with purely passive signal transmission between electrodes and differential amplifier is presented. This design is intended to improve transmission symmetry and thus common-mode rejection. The feasibility of the approach is demonstrated by measurements with different materials between body surface and electrodes. The ECG module shall be incorporated in a mobile sensor platform in the form of a plaster for the monitoring of chronic diseases.},
    author = {Kirchner, Jens and Roth, Nils and Meyer, Andreas and Fischer, Georg},
    booktitle = {Proc. IEEE Sensors Conf.},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060241},
    year = {2016},
    month = {10},
    day = {30},
    doi = {10.1109/ICSENS.2016.7808736},
    eventdate = {2016-10-30/2016-11-02},
    eventtitle = {IEEE Sensors},
    faupublication = {yes},
    keywords = {electrocardiogram; ECG; capacitive electrodes; passive channel; chronic disease monitoring},
    peerreviewed = {Yes},
    title = {ECG Measurement by Use of Passive Capacitively Coupled Electrodes},
    venue = {Orlando, FL, USA},
    }
  • [DOI] P. Kindt, D. Yunge, A. Tobola, G. Fischer, and S. Chakraborty, "Dynamic Service Switching for the Medical Internet of Things" in IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), Valencia, Spain, 2016, pp. 1-7. [Bibtex]
    @inproceedings{kindt2016,
    author = {Kindt, Philipp and Yunge, Daniel and Tobola, Andreas and Fischer, Georg and Chakraborty, Samarjit},
    booktitle = {IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060311},
    year = {2016},
    month = {09},
    day = {04},
    doi = {10.1109/PIMRC.2016.7794845},
    eventdate = {2016-09-04/2016-09-08},
    faupublication = {yes},
    pages = {1--7},
    peerreviewed = {unknown},
    title = {Dynamic Service Switching for the Medical Internet of Things},
    venue = {Valencia, Spain},
    }
  • Y. Can, H. Kassim, and G. Fischer, "Orthogonalization of DNF in TVL-Arithmetic" in 12th International Workshop of Boolean Problems, Freiberg, Germany, 2016. [Bibtex]
    @inproceedings{can2016,
    abstract = {In this paper two new equations for orthogonalization of disjunctive normal form are presented in Ternary-Vector-List arithmetic. They provides the mathematical solution of orthogonalization of disjunctive normal form. These new equations are based on the method of orthogonalizing difference-building and orthogonalizing OR-ing. Furthermore, they are compared in their number of operations. Their advantages in respect of computation time and the number of terms in the orthogonalized result are also shown. The presentation of both equations take place in Ternary-Vector-List arithmetic.},
    author = {Can, Yavuz and Kassim, Hassen and Fischer, Georg},
    language = {English},
    booktitle = {12th International Workshop of Boolean Problems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060255},
    year = {2016},
    month = {09},
    day = {22},
    eventdate = {2016-09-22/2016-09-23},
    eventtitle = {12th International Workshop on Boolean Problems},
    faupublication = {yes},
    keywords = {IC Test},
    peerreviewed = {Yes},
    title = {Orthogonalization of DNF in TVL-Arithmetic},
    type = {Konferenzschrift},
    url = {http://www.informatik.tu-freiberg.de/prof2/ws_bp12/index.html},
    venue = {Freiberg, Germany},
    }
  • [DOI] A. El Assaad, M. Krug, and G. Fischer, "Highly Accurate Distance Estimation Using Spatial Filtering and GNSS in Urban Environments" in Vehicular Technology Conference-VTC2016-Fall, Montreal, Canada, 2016. [Bibtex]
    @inproceedings{assaad2016c,
    author = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    booktitle = {Vehicular Technology Conference-VTC2016-Fall},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060262},
    year = {2016},
    month = {09},
    day = {18},
    doi = {10.1109/VTCFALL.2016.7881034},
    eventdate = {2016-09-18/2016-09-21},
    eventtitle = {IEEE-Vehicular Technology ConferenceVTC2016-Fall},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Highly Accurate Distance Estimation Using Spatial Filtering and GNSS in Urban Environments},
    type = {Konferenzschrift},
    venue = {Montreal, Canada},
    }
  • [DOI] V. A. Silva Cortes, V. Chauhan, R. Weigel, G. Fischer, and A. Hagelauer, "Nonlinear BAW Filter Effects on the Performance of an LTE Receiver" in IEEE International Ultrasonics Symposium, Tours, France, 2016, pp. 1-4. [Bibtex]
    @inproceedings{silva2016a,
    abstract = {In this work, the impact of the intrinsic nonlinear effects of BAW filters in the demodulation performance of an LTE receiver is evaluated. The nonlinear effects that shape the generation of higher harmonics in the BAW resonator are covered in a nonlinear model implemented in Keysight ADS and validated through nonlinear measurements done on a BAW resonator for its 2nd harmonic. The nonlinear filter characteristics and its power dependence are captured in a Poly Harmonic Distortion (PHD) model and used for the simulation of the LTE receiver.},
    author = {Silva Cortes, Victor Arturo and Chauhan, Vikrant and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    publisher = {International Ultrasonics Symposium},
    booktitle = {IEEE International Ultrasonics Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060284},
    year = {2016},
    month = {09},
    day = {18},
    doi = {10.1109/ULTSYM.2016.7728397},
    eventdate = {2016-09-18/2016-09-21},
    eventtitle = {IEEE International Ultrasonics Symposium},
    faupublication = {yes},
    keywords = {RF frontend; BAW; Nonlinear modeling},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Nonlinear BAW Filter Effects on the Performance of an LTE Receiver},
    venue = {Tours, France},
    }
  • [DOI] G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends", Radio Science, vol. 51, iss. 8, pp. 1363-1376, 2016. [Bibtex]
    @article{gottardo2016,
    abstract = {Duplex filters in modern base transceiver stations (BTS) provides the channel shape in order to perform common frequency division duplex (FDD) operation. Usually they are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. This solution provides the shaping of the signal spectrum directly at the output of the radio frequency (RF) power amplifiers (PAs) relaxing the transmitter design especially in the duplexer and the antenna sections. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. A model to describe the hybrid system is investigated and the relation between phase and resonance peaks in the resulting periodic band-pass transfer function is described. The stability condition of the system is analyzed using Nyquist criterion and defining a safe work region in order to avoid oscillation. A solution involving a number of digital feedback and forward branches is investigated defining recursive structure parameters of the hybrid filter. This last solution allows the closed loop system to show at the output of the RF amplifier a periodic band-pass with up to 500 KHz bandwidth. Moreover, the band-pass magnitude reaches up to 17 dB difference between maximum gain and attenuation.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    publisher = {AGU Journal - Wiley online Journal},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060286},
    year = {2016},
    month = {08},
    doi = {10.1002/2016RS005969},
    faupublication = {yes},
    issn = {0048-6604},
    journaltitle = {Radio Science},
    keywords = {active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters},
    number = {8},
    pages = {1363--1376},
    peerreviewed = {Yes},
    title = {Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends},
    volume = {51},
    }
  • A. El Assaad, M. Krug, and G. Fischer, "Hochgenaue Fahrzeugeigenlokalisierung mit der Nutzung einer Uniform Zirkularen Antennenanordnung" in Positionierung und Navigation für intelligente Verkehrssysteme (POSNAV), Berlin, Germany, 2016. [Bibtex]
    @inproceedings{assaad2016b,
    author = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    publisher = {DGON},
    booktitle = {Positionierung und Navigation für intelligente Verkehrssysteme (POSNAV)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060261},
    year = {2016},
    month = {07},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Hochgenaue Fahrzeugeigenlokalisierung mit der Nutzung einer Uniform Zirkularen Antennenanordnung},
    type = {Konferenzschrift},
    venue = {Berlin, Germany},
    }
  • [DOI] T. Heyn, J. Morgade, S. Petersen, K. Pfaffinger, E. Lang, M. Hertlein, and G. Fischer, "Integration of Broadcast and Broadband in LTE/5G (IMB5) - Experimental Results From the eMBMS Testbeds" in European Conference on Networks and Communications 2016, Athen, Greece, 2016, pp. 1-6. [Bibtex]
    @inproceedings{heyn2016,
    abstract = {In this paper, results of the project "Integration of Broadcast and Broadband in LTE/5G" (IMB5) project are described. The IMB5 project explores the LTE-broadcast mode eMBMS within two detailed SFN field trial networks in Erlangen and Munich, Germany and identifies potential improvements of the current broadcasting feature within LTE towards future releases of 4G and 5G. On the User Equipment (UE) side, terminals from Qualcomm and Samsung, based on commercial chipsets have been used mainly for application layer tests. For detailed physical layer tests, two different LTE software-defined-radio platforms based on OpenAirInterface framework and from National Instruments have been set-up to support detailed field experiments with the existing and future extended eMBMS beyond the state-of-the-art in LTE release 12. On the application layer, it is shown in the project, that using LTE eMBMS, a flexible service mix of unicast mobile broadband and broadcast linear TV can be delivered. For country wide deployment of eMBMS single-frequency networks, physical layer waveform modifications like an increased cyclic prefix compared to current LTE standard are recommended.},
    author = {Heyn, Thomas and Morgade, Javier and Petersen, Swen and Pfaffinger, Kerstin and Lang, Ekkehard and Hertlein, Markus and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {European Conference on Networks and Communications 2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060276},
    year = {2016},
    month = {06},
    day = {27},
    doi = {10.1109/EUCNC.2016.7561055},
    eventdate = {2016-06-27/2016-06-30},
    eventtitle = {European Conference on Networks and Communications EuCNC},
    faupublication = {yes},
    isbn = {9781509028931},
    keywords = {eMBMS; MBSFN; LTE-Broadcast 5G-Broadcast; Test facilities; Testbed; Field Trials; SDR platform},
    pages = {1--6},
    peerreviewed = {Yes},
    title = {Integration of Broadcast and Broadband in LTE/5G (IMB5) - Experimental Results From the eMBMS Testbeds},
    type = {Konferenzschrift},
    venue = {Athen, Greece},
    }
  • [DOI] A. Tobola, H. Leutheuser, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, and G. Fischer, "Battery Runtime Optimization Toolbox for Wearable Biomedical Sensors" in 13th International Conference on Wearable and Implantable Body Sensor Networks BSN, San Fransisco, CA, USA, 2016, pp. 199-204. [Bibtex]
    @inproceedings{tobola2016,
    abstract = {Battery runtime is a critical concern for practical usage of wearable biomedical sensor systems. A long runtime requires an interdisciplinary low-power knowledge and appropriate design tools. We addressed this issue designing a toolbox in three parts: 1) Modular evaluation kit for development of wearable ultralow- power biomedical sensors; (2) Miniaturized, wearable, and code compatible sensor system with the same properties as the development kit; (3) Web-based battery runtime calculator for our sensor systems. The purpose of the development kit is optimization of the power consumption. Once optimization is finished, the same embedded software can be transferred to the miniaturized body worn sensor. The web-based application supports development quantifying the effects of use case and design decisions on battery runtime. A sensor developer can select sensor modules, configure sensor parameters, enter use case specific requirements, and select a battery to predict the battery runtime for a specific application. Our concept adds value to development of ultra-low-power biomedical wearable sensors. The concept is effective for professional work and educational purposes.},
    author = {Tobola, Andreas and Leutheuser, Heike and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Fischer, Georg},
    language = {English},
    publisher = {IEEE},
    booktitle = {13th International Conference on Wearable and Implantable Body Sensor Networks BSN},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060318},
    year = {2016},
    month = {06},
    day = {14},
    doi = {10.1109/BSN.2016.7516259},
    eventdate = {2016-06-14/2016-06-17},
    eventtitle = {13th International Conference on Wearable and Implantable Body Sensor Networks BSN},
    faupublication = {yes},
    isbn = {9781509030873},
    keywords = {Batteries,Electrocardiography,Runtime,Power demand,Computational modeling,Temperature sensors,Biological system modeling},
    pages = {199--204},
    peerreviewed = {Yes},
    title = {Battery Runtime Optimization Toolbox for Wearable Biomedical Sensors},
    url = {http://ieeexplore.ieee.org/document/7516259/},
    venue = {San Fransisco, CA, USA},
    }
  • [DOI] A. El Assaad, M. Krug, and G. Fischer, "Distance and Vehicle Speed Estimation Using a Uniform Circular Array Antenna" in Vehicular Technology Conference, Nanjing, China, 2016. [Bibtex]
    @inproceedings{assaad2016,
    author = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    booktitle = {Vehicular Technology Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060245},
    year = {2016},
    month = {05},
    day = {15},
    doi = {10.1109/VTCSPRING.2016.7504196},
    eventdate = {2016-05-15/2016-05-18},
    eventtitle = {IEEE-Vehicular Technology Conference-VTC2016-Spring},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Distance and Vehicle Speed Estimation Using a Uniform Circular Array Antenna},
    venue = {Nanjing, China},
    }
  • [DOI] A. El Assaad, M. Krug, and G. Fischer, "Distance and Vehicle Speed Estimation in OFDM Multipath Channels" in MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications, Krakow, Poland, 2016. [Bibtex]
    @inproceedings{assaad2016a,
    author = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    booktitle = {MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060259},
    year = {2016},
    month = {05},
    day = {09},
    doi = {10.1109/MIKON.2016.7491943},
    eventdate = {2016-05-09/2016-05-11},
    eventtitle = {IEEE-International Conference on Microwave,Radar and Wireless Communications (MIKON)},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Distance and Vehicle Speed Estimation in OFDM Multipath Channels},
    type = {Konferenzschrift},
    venue = {Krakow, Poland},
    }
  • [DOI] V. A. Silva Cortes, D. Podoskin, J. Stegner, M. Fischer, S. Gropp, M. Hein, M. Hoffmann, J. Müller, R. Weigel, G. Fischer, and A. Hagelauer, "Evaluation of a Multiphysical RF MEMS Oscillator Based on LTE Receiver Performance Requirements" in International Conference on Microwave, Radar and Wireless Communications (MIKON), Krakow, Poland, 2016. [Bibtex]
    @inproceedings{silva2016,
    abstract = {A simulation methodology dealing with the complexity of multiphysical MEMS models and their evaluation according to RF specification is presented. It is focused towards the evaluation of a hybrid MEMS-CMOS RF oscillator prior its realization, based on the demodulation performance of an LTE user equipment. The proposed multiphysical simulation approach enables to meet the constraints of the receiver specification, the design rules for manufacturing and the implementation with the novel silicon-ceramic composite substrate (SiCer) based on co-simulation and a parametrized behavioral model of the MEMS resonator. Thus, allowing to successfully address the constraints at the different abstraction levels of the design and manufacturing processes.},
    author = {Silva Cortes, Victor Arturo and Podoskin, Dmitry and Stegner, Johannes and Fischer, Michael and Gropp, Sebastian and Hein, Matthias and Hoffmann, Martin and Müller, Jens and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    booktitle = {International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060295},
    year = {2016},
    month = {05},
    day = {09},
    doi = {10.1109/MIKON.2016.7492025},
    eventdate = {2016-05-09/2016-05-11},
    eventtitle = {International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Evaluation of a Multiphysical RF MEMS Oscillator Based on LTE Receiver Performance Requirements},
    venue = {Krakow, Poland},
    }
  • [DOI] Y. Can, H. Kassim, and G. Fischer, "New Boolean Equation for Orthogonalizing of Disjunctive Normal Form based on the Method of Orthogonalizing Difference-Building", Journal of Electronic Testing-Theory and Applications, vol. 32, iss. 2, pp. 197-208, 2016. [Bibtex]
    @article{can2016b,
    author = {Can, Yavuz and Kassim, Hassen and Fischer, Georg},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/1062001},
    year = {2016},
    month = {04},
    doi = {10.1007/S10836-016-5572-6},
    faupublication = {yes},
    issn = {0923-8174},
    journaltitle = {Journal of Electronic Testing-Theory and Applications},
    keywords = {Orthogonalizing Boolean Forms},
    number = {2},
    pages = {197--208},
    peerreviewed = {Yes},
    shortjournal = {J ELECTRON TEST},
    title = {New Boolean Equation for Orthogonalizing of Disjunctive Normal Form based on the Method of Orthogonalizing Difference-Building},
    volume = {32},
    }
  • A. Meyer, J. Kirchner, and G. Fischer, "EKG-Messung mittels passiver kapazitiv gekoppelter Elektroden" in Analogworkshop 2016, Hannover, 2016. [Bibtex]
    @inproceedings{meyer2016,
    abstract = {Hintergrund

    Kapazitiv gekoppelte Elektroden zur EKG-Erfassung erschließen seit einigen Jahren Anwendungsgebiete jenseits der klinischen Routine: Während dort zumeist galvanisch gekoppelte, insbesondere Nasselektroden zum Einsatz kommen, die direkten Hautkontakt erfordern und wegen des austrocknenden Elektrolytgels nur für kurze Messungen geeignet sind, erlauben kapazitive Elektroden Langzeit-Messungen und die Integration in Alltagsgegenstände wie Kleidung, Autositze oder Betten.

    Stand der Technik ist dabei eine aktive Ausführung, bei der direkt an der Elektrode das anliegende Signal verstärkt wird, bevor es in einem Differenzverstärker mit dem Signal einer zweiten Elektrode zusammengeführt wird. Allerdings führen in diesem Ansatz die Toleranzen der verwendeten aktiven Bauelemente zu asymmetrischem Übertragungsverhalten in den beiden Kanälen, sodass die Gleichtaktunterdrückung wesentlich beeinträchtigt wird.
    Um diesem Problem entgegenzuwirken und den Gleichlauf der Pfade von Elektrode bis Differenzverstärker zu verbessern, wurde ein EKG-System mit rein passiven Kanälen entwickelt.

    Methoden

    Für die Aufnahme der Messsignale wurden möglichst großflächige Elektroden mit jeweils 20cm2 Fläche verwendet. Da zwischen Elektrode und Differenzverstärker auf eine Verstärkung der Einzelsignale verzichtet wurde, ist auf dieser Strecke eine möglichst verlust- und störungsfreie Übertragung entscheidend. Hierfür wurde die jeweilige Leitung mit einer Ummantelung versehen, die auf demselben Potential wie die zugehörige Elektrode gehalten wird. Hierdurch werden äußere Störeinflüsse aktiv abgeschirmt, gleichzeitig werden durch den Bootstrap effektiv keine durch die Elektroden und die Signalleitungen hervorgerufenen parasitischen Eingangskapazitäten wirksam.

    Ferner wurde ein Differenzverstärker mit möglichst geringer Eingangskapazität und hoher CMRR gewählt. Um die Gleichtaktunterdrückung im Gesamtsystem zusätzlich zu erhöhen, wurde eine Bezugspotentialsteuerung eingesetzt. Hierbei wird die Common-Mode-Störung über eine dritte Elektrode invertiert und verstärkt in den Körper des Patienten zurückgespeist (sog. "driven right leg circuit").

    Schließlich wurde eine Baseline-Drift, hervorgerufen durch Ladungsansammlungen an den Elektroden, mittels langsamem Feedback korrigiert, indem Gleichspannungsanteile am Ausgang des Instrumentenverstärkers als Referenzspannung an diesen zurückgegeben werden.

    Ergebnisse

    Mit den beschriebenen Maßnahmen wurde ein stabiles EKG-Signal erhalten, das in der ersten Verstärkerstufe um einen Faktor 100, in der zweiten um einen Faktor 2000 verstärkt werden konnte.

    Exemplarische Messungen durch ein Baumwoll-T-Shirt hindurch zeigten in jedem Herzzyklus des aufgenommenen EKGs deutlich den QRS-Komplex, der sich zur Detektion von Arrhythmien eignet, sowie die T-Welle. Die P-Welle war vereinzelt zu erkennen. Vergleichbare Ergebnisse wurden bei Messungen durch Papier und Plastikfolie hindurch erzielt.

    Fazit

    Das entwickelte System ermöglicht die kontaktlose Messung der elektrischen Herzaktivität durch verschiedene Materialien hindurch und erzielte dabei rausch- und interferenzärmere Ergebnisse als vergleichbare Systeme mit kapazitiv gekoppelten Elektroden in aktiver Ausführung. Das System eignet sich damit für diverse Anwendungsbereiche, beispielsweise für den Einsatz auf einem Rückenpflaster oder zur Integration in Kleidung.}, author = {Meyer, Andreas and Kirchner, Jens and Fischer, Georg}, publisher = {Leibniz Universität Hannover}, booktitle = {Analogworkshop 2016}, cris = {https://cris.fau.de/converis/publicweb/publication/1060239}, year = {2016}, month = {03}, day = {03}, eventdate = {2016-03-03/2016-03-04}, eventtitle = {Analogworkshop 2016}, faupublication = {yes}, keywords = {ECG; capacitatively coupled electrode}, peerreviewed = {No}, title = {EKG-Messung mittels passiver kapazitiv gekoppelter Elektroden}, type = {Abstract zum Vortrag}, venue = {Hannover}, }

  • Y. Can and G. Fischer, "Orthogonalizing of DNF by a new Boolean method of orthogonalizing OR-ing", Journal of Discrete Algorithms, 2016. [Bibtex]
    @article{can2016c,
    author = {Can, Yavuz and Fischer, Georg},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061999},
    year = {2016},
    month = {03},
    day = {15},
    faupublication = {yes},
    issn = {1570-8667},
    journaltitle = {Journal of Discrete Algorithms},
    keywords = {KNF; DNF; ANF; Orthogonalization},
    peerreviewed = {Yes},
    title = {Orthogonalizing of DNF by a new Boolean method of orthogonalizing OR-ing},
    url = {https://www.journals.elsevier.com/journal-of-discrete-algorithms/},
    }
  • M. A. Sedaghat, R. Müller, G. Fischer, and A. Ali, "Discrete Load-Modulated Single-RF MIMO Transmitters" in 20th Int’l ITG Workshop on Smart Antennas, München, Germany, 2016. [Bibtex]
    @inproceedings{sedaghat2016,
    author = {Sedaghat, Mohammad Ali and Müller, Ralf and Fischer, Georg and Ali, Arslan},
    language = {English},
    booktitle = {20th Int’l ITG Workshop on Smart Antennas},
    cris = {https://cris.fau.de/converis/publicweb/publication/1044683},
    year = {2016},
    month = {03},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Discrete Load-Modulated Single-RF MIMO Transmitters},
    type = {Konferenzschrift},
    venue = {München, Germany},
    }
  • [DOI] M. Kloc, S. Rieß, J. Brendel, S. Linz, M. Gardill, R. Weigel, and G. Fischer, "Let's Make Them Cognitive! Cognitive Radio Technology Applied to Professional Wireless Microphone Systems", IEEE Microwave Magazine, vol. 17, iss. 1, pp. 70-78, 2016. [Bibtex]
    @article{kloc2016,
    author = {Kloc, Matej and Rieß, Steffen and Brendel, Johannes and Linz, Sarah and Gardill, Markus and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060302},
    year = {2016},
    month = {01},
    doi = {10.1109/MMM.2015.2487922},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {1},
    pages = {70--78},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Let's Make Them Cognitive! Cognitive Radio Technology Applied to Professional Wireless Microphone Systems},
    volume = {17},
    }
  • [DOI] A. El Assaad, M. Krug, and G. Fischer, "Vehicle Self-Localization for Advanced Driver Assistance Systems" in WPNC’2016 IEEE 13th Workshop on Positioning, Navigation and Communications, 2016. [Bibtex]
    @inproceedings{assaad2016d,
    author = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    booktitle = {WPNC’2016 IEEE 13th Workshop on Positioning, Navigation and Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060260},
    year = {2016},
    month = {01},
    doi = {10.1109/WPNC.2016.7822854},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Vehicle Self-Localization for Advanced Driver Assistance Systems},
    type = {Konferenzschrift},
    }

2015

  • [DOI] G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends" in Mediterranean Microwave Symposium, Lecce, Italy, 2015, pp. 227-230. [Bibtex]
    @inproceedings{gottardo2015a,
    abstract = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. The use of multiple digital feedback branches allows the closed loop system to show a periodic band-pass behavior at the output of the RF amplifier with a larger bandwidth up to 500 KHz. Moreover the band pass magnitude reaches up to 17 dB difference between maximum gain and attenuation.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    publisher = {IEEE},
    booktitle = {Mediterranean Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060230},
    year = {2015},
    month = {12},
    day = {30},
    doi = {10.1109/MMS.2015.7375476},
    eventdate = {2015-11-30/2015-12-02},
    faupublication = {yes},
    keywords = {active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {227--230},
    peerreviewed = {Yes},
    title = {Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends},
    venue = {Lecce, Italy},
    }
  • [DOI] Y. Can and G. Fischer, "New Orthogonalizing Boolean Equation using in the Calculation of Test Patterns for Combinatorial Circuits" in 9th International Conference on Electrical and Electronics Engineering, Bursa, Turkey, 2015. [Bibtex]
    @inproceedings{can2015a,
    author = {Can, Yavuz and Fischer, Georg},
    language = {English},
    booktitle = {9th International Conference on Electrical and Electronics Engineering},
    cris = {https://cris.fau.de/converis/publicweb/publication/1062003},
    year = {2015},
    month = {11},
    day = {26},
    doi = {10.1109/ELECO.2015.7394481},
    eventdate = {2015-11-26/2015-11-28},
    faupublication = {yes},
    keywords = {Boolean Normal Forms},
    peerreviewed = {Yes},
    title = {New Orthogonalizing Boolean Equation using in the Calculation of Test Patterns for Combinatorial Circuits},
    venue = {Bursa, Turkey},
    }
  • M. Gardill, S. Linz, G. Fischer, and R. Weigel, "Praktikumsversuch CW/FMCW-Radar auf Basis von myRIO," in Virtuelle Instrumente in der Praxis 2015, R. Jamal Rahman; Heinze, Ed., VDE-Verlag, 2015, pp. 376-382. [Bibtex]
    @inbook{gardill2015,
    abstract = {Im Rahmen der Akademischen Bildungsinitiative zur Elektromobilität Bayern – Sachsen, gefördert durch die Initiative Schaufenster Elektromobilität der Bundesregierung, ist an der FAU Erlangen-Nürnberg ein neuer Praktikumsversuch zum Thema drahtlose Automobilelektronik entstanden. Im Rahmen dieses Praktikumsversuchs entwicklen und evaluieren die Studierenden ein CW/FMCW Radarsystem bei 24GHz. Das Radarsystem besteht dabei lediglich aus zwei Hardwarekomponenten: einem industriellen low-cost Radar Frontend sowie der National Instruments myRIO Plattform, es sind keine weiteren Hardwarekomponen-ten notwendig. In diesem Beitrag wird gezeigt, wie die myRIO Plattform in diesem Praktikumsversuch eingesetzt wird und wie mit myRIO somit kostengünstig ein technisch anspruchsvoller Versuch im Bereich der Mikrowellentechnik realisiert wird.},
    author = {Gardill, Markus and Linz, Sarah and Fischer, Georg and Weigel, Robert},
    editor = {Jamal, Rahman; Heinze, Ronald},
    publisher = {VDE-Verlag},
    booktitle = {Virtuelle Instrumente in der Praxis 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060210},
    year = {2015},
    month = {10},
    faupublication = {yes},
    isbn = {9783800736690},
    pages = {376--382},
    peerreviewed = {Yes},
    title = {Praktikumsversuch CW/FMCW-Radar auf Basis von myRIO},
    type = {Band aus einer Reihe},
    }
  • G. Fischer, J. Brendel, and S. Rieß, "Cognitive PMSE for Spectrum Sharing at UHF" in Wireless Innovation Forum (SDR Forum Version 2.0), Conference on Communication Technologies and Software Defined Radio WINCOMM, Erlangen, Germany, 2015. [Bibtex]
    @inproceedings{fischer2015a,
    abstract = {This talk reports about work in ETSI STF386 pre-standardisation and a German national Research Project by BMWI named C-PMSE dealing with cognitive interference management to allow for coexistance of PMSE, DVB-T and LTE at UHF Band.},
    author = {Fischer, Georg and Brendel, Johannes and Rieß, Steffen},
    language = {English},
    publisher = {Wireless Innovation Forum},
    booktitle = {Wireless Innovation Forum (SDR Forum Version 2.0), Conference on Communication Technologies and Software Defined Radio WINCOMM},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060188},
    year = {2015},
    month = {09},
    day = {06},
    eventdate = {2015-10-06/2015-10-08},
    eventtitle = {Wireless Innovation Forum (SDR Forum Version 2.0), Conference on Communication Technologies and Software Defined Radio WINCOMM},
    faupublication = {yes},
    keywords = {SDR; PMSE; C-PMSE; CR; UHF},
    peerreviewed = {No},
    title = {Cognitive PMSE for Spectrum Sharing at UHF},
    type = {Konferenzschrift},
    url = {http://www.wirelessinnovation.org/conference_proceedings},
    venue = {Erlangen, Germany},
    }
  • G. Fischer, "Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE" in EUMW European Microwave Week, Paris, France, 2015. [Bibtex]
    @inproceedings{fischer2015b,
    abstract = {There have been two initiatives one in ETSI called STF386 and one inside a German national research project named C-PMSE funded by BMWI (German Ministry of Research and Education), that both deal with cognitive radio resource management for PMSE. The ambition was to mitigate interference through cognitive techniques. Principles of cognitive radio technology were adapted to the specific requirements of PMSE. The talk will therefore start highlighting the specific characteristics of PMSE, which strongly deviate from other known systems. PMSE demands very high availability near 100% in order to avoid drop-outs. Furthermore PMSE systems often are demanded to support very low latency in the order of 2 ms per PMSE link and 5 ms round trip. As PMSE usually can’t use heavy compression techniques (Digital Source coding or analogue compression) and channels are typically narrowband (e.g. 200 kHz), the operational SNR at RF is very high in the order of 50 dB. This makes PMSE very vulnerable to interference whether originating from other systems or own transmitter intermodulation. Cognitive resource management will dynamically adjust the transmit frequencies and transmit power of PMSE equipment. If the link quality degrades or is somehow about to degrade then above radio resource parameters are readjusted. The cognitive radio resource management is following the general rationale defined by the cognitive cycle as e.g. depicted by Mitola. For this purpose knowledge about the actual situation is needed. This knowledge is obtained by supervising actual link quality regardless whether analogue or digital transmission is used and by obtaining a radio environment map and consulting a geolocation database. In order to build this radio environment map, a grid of spectrum sensors is installed at an event location. Movement profiles of PMSE devices can thus be detected. It is important to stress that the cognitive regime followed includes nonlinear consideration. Spectrum resources interdepend due to non-linear effects, meaning that PMSE links could be interfered by transmit intermodulation from two other PMSE links, which makes the management of large scale events with many PMSE links challenging. Due to high operational SNR of PMSE links intermodulation products up to 5th sometimes even 7th order must be considered in transmit frequency assignment. The techniques derived during the course of the ETSI STF386 and BMWI C-PMSE project were implemented and practically studied in a trial at Messe Berlin. Luckily partners in the two initiatives were nearly identical and work in both initiatives was conducted in synchronous manner. The talk will therefore also highlight the practical implementations and trials conducted, that proofed the desired functionality. Although the technologies developed proofed that interference could be mitigated and thus PMSE links get more reliable in spectrum hostile environments, it was discovered that no additional capacity can be obtained.},
    author = {Fischer, Georg},
    language = {English},
    publisher = {EUMA},
    booktitle = {EUMW European Microwave Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060189},
    year = {2015},
    month = {09},
    day = {06},
    eventdate = {2015-09-06/2015-09-11},
    eventtitle = {European Microwave Week -},
    faupublication = {yes},
    keywords = {PMSE; C-PMSE; UHF; CR; SDR},
    peerreviewed = {No},
    title = {Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE},
    type = {Konferenzschrift},
    venue = {Paris, France},
    }
  • [DOI] A. Tobola, R. Rybalko, O. Korpok, F. Streit, C. Espig, C. Hofmann, B. Schmitz, M. Struck, C. Weigand, and G. Fischer, "ULPSEK – Ultra-Low-Power Sensor Evaluation Kit" in FOCUS Session "Wearable Sensors", BMT, 2015, 2015. [Bibtex]
    @inproceedings{tobola2015b,
    author = {Tobola, Andreas and Rybalko, Ruslan and Korpok, Oliver and Streit, Franz and Espig, Chris and Hofmann, Christian and Schmitz, Björn and Struck, Matthias and Weigand, Christian and Fischer, Georg},
    booktitle = {FOCUS Session "Wearable Sensors", BMT, 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060214},
    year = {2015},
    month = {09},
    day = {16},
    doi = {10.1515/BMT-2015-5018},
    eventdate = {2015-09-16/2015-09-16},
    faupublication = {yes},
    peerreviewed = {No},
    title = {ULPSEK – Ultra-Low-Power Sensor Evaluation Kit},
    }
  • [DOI] Y. Can and G. Fischer, "Orthogonalizing Boolean Subtraction of Minterms or Ternary Vectors", Archives of Materials Science and Engineering, vol. 2B, iss. Vol 128, 2015. [Bibtex]
    @article{can2014,
    author = {Can, Yavuz and Fischer, Georg},
    language = {English},
    booktitle = {ACTA PHYSICA POLONICA A},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060065},
    year = {2015},
    month = {08},
    day = {25},
    doi = {10.12693/APHYSPOLA.128.B-388},
    eventdate = {2014-10-25/2014-10-29},
    eventtitle = {International Conference on Computational and Experimental Science and Engineering (ICCESEN)},
    faupublication = {yes},
    issn = {1897-2764},
    journaltitle = {Archives of Materials Science and Engineering},
    number = {Vol 128},
    peerreviewed = {Yes},
    title = {Orthogonalizing Boolean Subtraction of Minterms or Ternary Vectors},
    venue = {Antalya, Turkey},
    volume = {2B},
    }
  • G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for High Selectivity in RF Transmitter Front-Ends" in 2nd International Scientific Symposium ”Sense. Enable. SPITSE.” 2015, St. Petersburg, Russia, 2015, pp. 15-18. [Bibtex]
    @inproceedings{gottardo2015,
    abstract = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband feedback applied to the analog power amplifiers is described making use of a model here verified by measurements. The design of hybrid filters allows the closed loop system to reach up to 20 dB difference between maximum gain and attenuation. Particular attention is dedicated to preserve stability conditions. The proposed architecture has the potential to reduce the cost and size of the RF front-ends.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    language = {English},
    publisher = {St. Petersburg Electrotechnical University "LETI" Symposium Proceedings - IEEE},
    booktitle = {2nd International Scientific Symposium ”Sense. Enable. SPITSE.” 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060198},
    year = {2015},
    month = {07},
    day = {22},
    eventdate = {2015-06-22/2015-07-03},
    eventtitle = {2nd International Scientific Symposium "Sense. Enable. SPITSE."},
    faupublication = {yes},
    keywords = {Active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {15--18},
    peerreviewed = {Yes},
    title = {Hybrid Recursive Active Filters for High Selectivity in RF Transmitter Front-Ends},
    type = {Konferenzschrift},
    url = {http://www.eltech.ru/ru/mezhdunarodnaya-deyatelnost/spitse},
    venue = {St. Petersburg, Russia},
    }
  • [DOI] A. Tobola, F. Streit, C. Espig, O. Korpok, H. Leutheuser, C. Sauter, N. Lang, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, and G. Fischer, "Sampling rate impact on energy consumption of biomedical signal processing systems" in 2015 IEEE 12th International Conference on Wearable and Implantable Body Sensor Networks, BSN 2015, Cambridge, USA, 2015, pp. 1-6. [Bibtex]
    @inproceedings{tobola2015a,
    author = {Tobola, Andreas and Streit, Franz and Espig, Chris and Korpok, Oliver and Leutheuser, Heike and Sauter, Christian and Lang, Nadine and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Fischer, Georg},
    publisher = {Institute of Electrical and Electronics Engineers Inc.},
    booktitle = {2015 IEEE 12th International Conference on Wearable and Implantable Body Sensor Networks, BSN 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1048274},
    year = {2015},
    month = {06},
    day = {09},
    doi = {10.1109/BSN.2015.7299392},
    eventdate = {2015-06-09/2015-06-12},
    eventtitle = {12th International Conference on Wearable and Implantable Body Sensor Networks (BSN)},
    faupublication = {yes},
    isbn = {9781467372015},
    pages = {1--6},
    peerreviewed = {Yes},
    title = {Sampling rate impact on energy consumption of biomedical signal processing systems},
    type = {Konferenzschrift},
    venue = {Cambridge, USA},
    }
  • G. Fischer, "The spectrum situation for PMSE - Or why is PMSE so unique?" in PEARLE Conference, Hamburg, Germany, 2015. [Bibtex]
    @inproceedings{fischer2015,
    author = {Fischer, Georg},
    language = {English},
    publisher = {PEARLE},
    booktitle = {PEARLE Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060231},
    year = {2015},
    month = {06},
    day = {12},
    eventdate = {2015-06-12/2015-06-13},
    eventtitle = {49th Pearle* Conference - Performing Arts Employers Associations League Europe},
    faupublication = {yes},
    keywords = {PMSE; C-PMSE; UHF; CR; SDR; Multimedia},
    peerreviewed = {No},
    title = {The spectrum situation for PMSE - Or why is PMSE so unique?},
    type = {Konferenzschrift},
    venue = {Hamburg, Germany},
    }
  • [DOI] G. A. Guarin Aristizabal, M. Hofmann, J. Nehring, R. Weigel, G. Fischer, and D. Kissinger, "Miniature Microwave Biosensors: Noninvasive Applications", IEEE Microwave Magazine, vol. 16, iss. 4, pp. 71-86, 2015. [Bibtex]
    @article{guarin2015a,
    author = {Guarin Aristizabal, Gustavo Adolfo and Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060199},
    year = {2015},
    month = {05},
    doi = {10.1109/MMM.2015.2394024},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {4},
    pages = {71--86},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Miniature Microwave Biosensors: Noninvasive Applications},
    volume = {16},
    }
  • [DOI] Y. Can and G. Fischer, "Boolean Orthogonalizing Combination Methods" in Fifth International Conference on Computational Science, Engineering and Information Technology, Vienna, Austria, 2015. [Bibtex]
    @inproceedings{can2015,
    author = {Can, Yavuz and Fischer, Georg},
    language = {English},
    booktitle = {Fifth International Conference on Computational Science, Engineering and Information Technology},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060174},
    year = {2015},
    month = {05},
    day = {23},
    doi = {10.5121/CSIT.2015.51102},
    eventdate = {2015-05-23/2015-05-24},
    eventtitle = {Fifth International Conference on Computational Science, Engineering and Information Technology CCSEIT 2015},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Boolean Orthogonalizing Combination Methods},
    type = {Konferenzschrift},
    url = {http://www.airccj.org/CSCP/vol5/csit54102.pdf},
    venue = {Vienna, Austria},
    }
  • [DOI] J. Röber, A. Bänisch, G. Fischer, and R. Weigel, "A Low Noise Amplifier Chain for Digital Satellite Radio Applications" in IEEE International Symposium on Circuits and Systems (ISCAS), Lisabon, 2015. [Bibtex]
    @inproceedings{roeber2015,
    abstract = {This paper contains the development and verification of low noise amplifier stages (LNA) within the framework of a front-end for digital satellite radio diversity receiver operating around 2.3 GHz. First, a low noise high gain LNA is developed to reach the high requirements of satellite radio reception. Therefore a single-ended cascode architecture is chosen. The simulated noise figure is 0.58 dB and the gain is 19.87 dB. Second, a differential stage is designed to fulfill the specification with regards to backward isolation and common-mode rejection. This circuit has a measured gain of 10.15 dB and a backward isolation of -43.24 dB. Furthermore, the two stages are combined by an integrated balun and the overall performance is verified. Due to the good noise performance of the first stage, the overall noise figure is 0.64 dB, the gain is 29.83 dB and the backward isolation is - 76.07 dB. All in all the whole circuit has a current consumption of 25.40 mA. Finally the LNA performance is compared with other state-of-the-art LNAs.},
    author = {Röber, Jürgen and Bänisch, Andreas and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE International Symposium on Circuits and Systems (ISCAS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060207},
    year = {2015},
    month = {05},
    doi = {10.1109/ISCAS.2015.7169187},
    eventtitle = {IEEE International Symposium on Circuits and Systems (ISCAS)},
    faupublication = {yes},
    keywords = {LNA; low noise; high gain; differential; distortion canceller; CCPDC},
    peerreviewed = {Yes},
    title = {A Low Noise Amplifier Chain for Digital Satellite Radio Applications},
    venue = {Lisabon},
    }
  • [DOI] V. A. Silva Cortes and G. Fischer, "Shunt MEMS switch requirements for Tunable Matching Network at 1.9 GHz in composite substrates" in German Microwave Conference (GeMiC), Nürnberg, 2015, pp. 422-425. [Bibtex]
    @inproceedings{silva2015,
    abstract = {A theoretical approach for the specification of shunt MEMS switches suitable for Tunable Matching Networks (TMN) at 1.9GHz is presented. DC-contact fixed-fixed beam MEMS switches designed with series metal-insulator-metal (MIM) capacitors at the grounding plane of a CPW transmission line provide the basic design block for the TMN. In the down-state, the MEMS switch makes an ohmic contact with the transmission line, as consequence, the down-state capacitance of the switch is dominated by the MIM capacitors. The proper dimensioning of the MIM capacitors enables to directly increase the capacitance ratio of the switch in order to operate at frequencies below 10 GHz. Based on predefined CPW transmission line configurations on composite substrates, the optimization of the capacitance ratio of the MEMS switch can be directly related to the geometry of the CPW transmission line.},
    author = {Silva Cortes, Victor Arturo and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060212},
    year = {2015},
    month = {03},
    day = {16},
    doi = {10.1109/GEMIC.2015.7107843},
    eventdate = {2015-03-16/2015-03-18},
    eventtitle = {German Microwave Conference (GeMiC)},
    faupublication = {yes},
    keywords = {RF MEMS},
    pages = {422--425},
    peerreviewed = {Yes},
    title = {Shunt MEMS switch requirements for Tunable Matching Network at 1.9 GHz in composite substrates},
    venue = {Nürnberg},
    }
  • [DOI] G. A. Guarin Aristizabal, M. Gardill, R. Weigel, G. Fischer, and D. Kissinger, "Ultra-wideband compressed sensing radar based on pseudo-random binary sequences" in German Microwave Conference, Nuremberg, Germany, 2015, pp. 233-236. [Bibtex]
    @inproceedings{guarin2015,
    author = {Guarin Aristizabal, Gustavo Adolfo and Gardill, Markus and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060195},
    year = {2015},
    month = {03},
    doi = {10.1109/GEMIC.2015.7107796},
    faupublication = {yes},
    pages = {233--236},
    peerreviewed = {Yes},
    title = {Ultra-wideband compressed sensing radar based on pseudo-random binary sequences},
    venue = {Nuremberg, Germany},
    }
  • [DOI] D. Karolewski, A. Tag, V. A. Silva Cortes, A. Hagelauer, G. Fischer, and C. Schäffel, "Modeling of BAW Filters for System Level Simulation" in German Microwave Conference, Nuremberg, 2015, pp. 410-413. [Bibtex]
    @inproceedings{karolewski2015,
    author = {Karolewski, Dominik and Tag, Andreas and Silva Cortes, Victor Arturo and Hagelauer, Amelie and Fischer, Georg and Schäffel, Christoph},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060153},
    year = {2015},
    month = {03},
    day = {16},
    doi = {10.1109/GEMIC.2015.7107840},
    eventdate = {2015-03-16/2015-03-18},
    eventtitle = {German Microwave Conference (GeMiC)},
    faupublication = {yes},
    pages = {410--413},
    peerreviewed = {Yes},
    title = {Modeling of BAW Filters for System Level Simulation},
    venue = {Nuremberg},
    }
  • [DOI] T. Kastenhuber, J. Röber, A. Bänisch, G. Fischer, and R. Weigel, "A Miniaturized Very Low-Power Vector Modulated CMOS Phase Shifter for Wireless Receivers" in German Microwave Conference, Nürnberg, 2015, pp. 343-346. [Bibtex]
    @inproceedings{kastenhuber2015,
    abstract = {This paper presents and analyses a phase shifter for diversity receivers, which modulates the I-/Q-vector in the constellation diagram. The system consists of a three stage programmable gain amplifier (PGA) chain in both branches. The design covers the full phase range of 360°. Each stage can be programmed to amplify the incoming signal between 19 dB and 63 dB with a centre frequency of 3MHz. The radio frequency (RF) signal is down-converted to an intermediate frequency (IF) of 5MHz, where phase shifting is done. The circuit is intended for an automotive satellite radio receiver in S- and L-band. Thus, demand automotive requirements have to be fulfilled. The supply voltage is 1.8V. Compared to other phase shifters, the power consumption of 2.7mW is highly energyefficient. This system includes a constant gm-source and a biasing circuit. All requirements are verified in post-layout Corner and Monte-Carlo analysis using Virtuoso and WiCkeD. The design only takes 0.116 mm2 of silicon area in a 150- nm CMOS technology.},
    author = {Kastenhuber, Tina and Röber, Jürgen and Bänisch, Andreas and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060234},
    year = {2015},
    month = {03},
    doi = {10.1109/GEMIC.2015.7107823||10.1109/GEMIC.2015.7107823},
    eventtitle = {German Microwave Conference},
    faupublication = {yes},
    keywords = {Phase shifter; vector modulated; PGA; constant gm-source; low-power; diversity},
    pages = {343--346},
    peerreviewed = {Yes},
    title = {A Miniaturized Very Low-Power Vector Modulated CMOS Phase Shifter for Wireless Receivers},
    venue = {Nürnberg},
    }
  • [DOI] D. Kissinger, A. Schwarzmeier, F. Grimminger, J. Mena-Carrillo, W. Weber, G. Hofer, G. Fischer, and R. Weigel, "Wireless integrated sensor nodes for indoor monitoring and localization (invited)" in IEEE Topical Conference on Wireless Sensors and Sensor Networks, San Diego, CA, 2015, pp. 7-10. [Bibtex]
    @inproceedings{kissinger2015,
    author = {Kissinger, Dietmar and Schwarzmeier, Andre and Grimminger, Florian and Mena-Carrillo, Juan and Weber, Werner and Hofer, Günter and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060167},
    year = {2015},
    month = {01},
    doi = {10.1109/WISNET.2015.7127397},
    faupublication = {yes},
    pages = {7--10},
    peerreviewed = {Yes},
    title = {Wireless integrated sensor nodes for indoor monitoring and localization (invited)},
    venue = {San Diego, CA},
    }
  • [DOI] M. Dudek, I. Nasr, G. Bozsik, M. Hamouda, D. Kissinger, and G. Fischer, "System Analysis of a Phased-Array Radar Applying Adaptive Beam-Control for Future Automotive Safety Applications", IEEE Transactions on Vehicular Technology, vol. 64, iss. 1, pp. 34-47, 2015. [Bibtex]
    @article{dudek2015,
    author = {Dudek, Manuel and Nasr, Ismail and Bozsik, Gabor and Hamouda, Mohamed and Kissinger, Dietmar and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060229},
    year = {2015},
    month = {01},
    doi = {10.1109/TVT.2014.2321175},
    faupublication = {yes},
    issn = {0018-9545},
    journaltitle = {IEEE Transactions on Vehicular Technology},
    number = {1},
    pages = {34--47},
    peerreviewed = {Yes},
    shortjournal = {IEEE T VEH TECHNOL},
    title = {System Analysis of a Phased-Array Radar Applying Adaptive Beam-Control for Future Automotive Safety Applications},
    volume = {64},
    }
  • A. Tobola, C. Espig, F. J. Streit, O. Korpok, H. Leutheuser, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, and G. Fischer, "Scalable ECG Hardware and Algorithms for Extended Runtime of Wearable Sensors" in 2015 IEEE International Symposium on Medical Measurements and Applications, Torino, Italy, 2015, pp. 255-260. [Bibtex]
    @inproceedings{tobola2015,
    author = {Tobola, Andreas and Espig, Chris and Streit, Franz J. and Korpok, Oliver and Leutheuser, Heike and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Fischer, Georg},
    booktitle = {2015 IEEE International Symposium on Medical Measurements and Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1030924},
    year = {2015},
    eventtitle = {MeMeA},
    faupublication = {yes},
    isbn = {9781479964765},
    pages = {255--260},
    title = {Scalable ECG Hardware and Algorithms for Extended Runtime of Wearable Sensors},
    venue = {Torino, Italy},
    }
  • [DOI] M. Schütz, A. Georgiadis, A. Collado, and G. Fischer, "A particle swarm optimizer for tuning a software-defined, highly configurable wireless power transfer platform" in Wireless Power Transfer Conference (WPTC), 2015 IEEE, 2015, pp. 1-4. [Bibtex]
    @inproceedings{schuetz2015,
    author = {Schütz, Martin and Georgiadis, Apostolos and Collado, Ana and Fischer, Georg},
    booktitle = {Wireless Power Transfer Conference (WPTC), 2015 IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1047549},
    year = {2015},
    doi = {10.1109/WPT.2015.7139137},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {No},
    title = {A particle swarm optimizer for tuning a software-defined, highly configurable wireless power transfer platform},
    }

2014

  • Y. Can and G. Fischer, "Orthogonalizing Boolean Subtraction of Minterms or Ternary- Vectors" in International Conference on Computational and Experimental Science and Engineering (ICCESEN2014), Antalya, Turkey, 2014. [Bibtex]
    @inproceedings{can2014a,
    author = {Can, Yavuz and Fischer, Georg},
    booktitle = {International Conference on Computational and Experimental Science and Engineering (ICCESEN2014)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1062049},
    year = {2014},
    month = {10},
    day = {24},
    eventdate = {2014-10-24/2014-10-29},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Orthogonalizing Boolean Subtraction of Minterms or Ternary- Vectors},
    venue = {Antalya, Turkey},
    }
  • [DOI] A. Schwarzmeier, N. Roth, R. Weigel, G. Fischer, and D. Kissinger, "A Fall Detection and Activity Monitoring Algorithm for a Tele-Care System Supporting Dementia and Alzheimer Patients" in BMT 2014 - 48. Jahrestagung der DGBMT, Germany, 2014. [Bibtex]
    @inproceedings{schwarzmeier2014a,
    abstract = {Dementia and Alzheimer patients who show a “wandering” behaviour combined with excessive activity and unsteady gait are exposed to a particular risk of dangerous falls. Fast and efficient help in case of such an emergency could be provided by a tele-care system comprising a mobile back-plaster as an on-body sensor node that is equipped with sen-sors which not only capture activity and movement data from the patient but also enable indoor and outdoor localiza-tion. This node is linked to an internet server infrastructure including a back-end software. In order to enhance the care quality reliable algorithms for activity monitoring and fall detection are needed.},
    author = {Schwarzmeier, Andre and Roth, Nils and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {BMT 2014 - 48. Jahrestagung der DGBMT},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060072},
    year = {2014},
    month = {10},
    doi = {10.1515/BMT-2014-4100},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Fall Detection and Activity Monitoring Algorithm for a Tele-Care System Supporting Dementia and Alzheimer Patients},
    venue = {Germany},
    }
  • [DOI] J. Walk, J. Kolpak, C. Söll, R. Weigel, G. Fischer, and T. Ußmüller, "Remote powered medical implants for Telemonitoring (Invited Paper)", Proceedings of the IEEE, vol. 102, iss. 10, pp. 100-116, 2014. [Bibtex]
    @article{walk2014,
    abstract = {Chronicle diseases like diabetes mellitus often need a permanent monitoring of vital signs. Especially the use of telemedicine might increase the quality of life for concerned patients. New systems are required which permanently detect and provide health status information. But, these systems must not control patient’s life and shall work autonomous. For this purpose, intelligent medical implants are well qualified. The present work describes a system for wireless power supply and communication with medical implant applications. Monitoring vital signs might lead to a big amount of data. Therefore, high data rates are necessary provided by high operating frequencies. High frequencies in turn lead to high attenuation losses because of the frequency dependent relative permittivity $\epsilon_r$ of the human body. Hence, high frequencies are not suitable for energy transfer through the human body. The presented concept is based on two different frequencies for power supply and data transmission. An independent devel- opment of both blocks is possible. The power supply operates on 13.56 MHz using inductive coupling. Thereby, the human body doesn’t affect the energy transfer. In contrast, the data transmission is operated by a frequency of the Medical Implant Communication Service band. The elaborated system consists of an power supply unit, a data transmission unit and a control unit. The implementation of the power supply and data transmission as well as associated theoretical basics are presented. Performed measurements demonstrate that the realized system is qualified for the use on human beings.},
    author = {Walk, Jasmin and Kolpak, Jasmin and Söll, Christopher and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060053},
    year = {2014},
    month = {10},
    doi = {10.1109/JPROC.2014.2359517},
    faupublication = {yes},
    issn = {0018-9219},
    journaltitle = {Proceedings of the IEEE},
    keywords = {biological tissues; biomedical communication; biomedical power supplies; energy storage; frequency domain analysis; implantable biomedical devices; permittivity},
    number = {10},
    pages = {100--116},
    peerreviewed = {Yes},
    shortjournal = {P IEEE},
    title = {Remote powered medical implants for Telemonitoring (Invited Paper)},
    volume = {102},
    }
  • [DOI] I. Nasr, J. Nehring, K. Aufinger, G. Fischer, R. Weigel, and D. Kissinger, "Single- and Dual-Port 50-100-GHz Integrated Vector Network Analyzers With On-Chip Dielectric Sensors", IEEE Transactions on Microwave Theory and Techniques, vol. 62, iss. 9, pp. 2168-2179, 2014. [Bibtex]
    @article{nasr2014a,
    abstract = {This work presents a single- and dual-port fully integrated millimeter-wave ultra-broadband vector network analyzer. Both circuits, realized in a commercial ${hbox{0.35-}}mu{hbox {m}}$ SiGe:C technology with an $f_{t}/f_{max}$ of ${hbox{170/250 GHz}}$, cover an octave frequency bandwidth between 50–100 GHz. The presented chips can be configured to measure complex scattering parameters of external devices or determine the permittivity of different materials using an integrated millimeter-wave dielectric sensor. Both devices are based on a heterodyne architecture that achieves a receiver dynamic range of 57–72.5 dB over the complete design frequency range. Two integrated frequency synthesizer modules are included in each chip that enable the generation of the required test and local-oscillator millimeter-wave signals. A measurement $3sigma $ statistical phase error lower than 0.3$\^{}{circ}$ is achieved. Automated measurement of changes in the dielectric properties of different materials is demonstrated using the proposed systems. The single- and dual-port network analyzer chips have a current consumption of 600 and 700 mA, respectively, drawn from a single 3.3-V supply.},
    author = {Nasr, Ismail and Nehring, Johannes and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060111},
    year = {2014},
    month = {09},
    doi = {10.1109/TMTT.2014.2337264},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {9},
    pages = {2168--2179},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Single- and Dual-Port 50-100-GHz Integrated Vector Network Analyzers With On-Chip Dielectric Sensors},
    volume = {62},
    }
  • [DOI] J. Brendel, S. Rieß, S. Schröter, R. Weigel, and G. Fischer, "Signal detection and cooperative sensing with sensor nodes with limited dynamic" in IEEE International Workshop on Cognitive Cellular Systems (CCS), Rhine River, Germany, 2014, pp. 1-5. [Bibtex]
    @inproceedings{brendel2014a,
    abstract = {The paper investigates the performance of the energy detector in fading environments under the constraint, that each sensor has only a limited dynamic range. First, the effects which limit the dynamic of a sensor node are discussed before the influence on the energy detector is analyzed. Simulations are presented how cooperative spectrum sensing affects the detection probability and it is shown that a sensing network with limited dynamic can gain much more from cooperation compared to a sensor network with ideal sensor nodes.},
    author = {Brendel, Johannes and Rieß, Steffen and Schröter, Simon and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE International Workshop on Cognitive Cellular Systems (CCS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060066},
    year = {2014},
    month = {09},
    day = {02},
    doi = {10.1109/CCS.2014.6933788},
    eventdate = {2014-09-02/2014-09-04},
    faupublication = {yes},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {Signal detection and cooperative sensing with sensor nodes with limited dynamic},
    venue = {Rhine River, Germany},
    }
  • [DOI] A. Stöckle, S. Lutz, A. Talai, and G. Fischer, "A New Approach For A Dual-Polarized Low Cost Patch Antenna With Low Cross- Polarization, High Bandwidth And High Isolation" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, Palm Beach, Aruba, 2014, pp. 357-360. [Bibtex]
    @inproceedings{stoeckle2014,
    abstract = {In this paper a new approach for a dual- polarized broadband patch antenna is presented. A novel feeding approach enables a high -10dB band- width up to 21 % as well as an isolation more than -29 dB. The realized antenna gain is > 6 dBi in the frequency range of 1320 MHz to 1680 MHz. Addi- tional, due to the re ector shaping, a low back ra- diation is achieved. Since standard components and FR4 material are used, the antenna concept enables an e ective low cost antenna production.},
    author = {Stöckle, Andreas and Lutz, Steffen and Talai, Armin and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060090},
    year = {2014},
    month = {08},
    doi = {10.1109/APWC.2014.6905556},
    faupublication = {yes},
    pages = {357--360},
    peerreviewed = {unknown},
    title = {A New Approach For A Dual-Polarized Low Cost Patch Antenna With Low Cross- Polarization, High Bandwidth And High Isolation},
    venue = {Palm Beach, Aruba},
    }
  • [DOI] S. Schröter, J. Brendel, R. Weigel, and G. Fischer, "Performance Improvement of UMTS Uplink Beamsteering with Limited Feedback at Higher Terminal Velocity by Designing Adapted Algorithms" in International Conference on Communications(ICC), Sydney, Australia, 2014. [Bibtex]
    @inproceedings{schroeter2014a,
    author = {Schröter, Simon and Brendel, Johannes and Weigel, Robert and Fischer, Georg},
    booktitle = {International Conference on Communications(ICC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059914},
    year = {2014},
    month = {06},
    day = {10},
    doi = {10.1109/ICC.2014.6884219},
    eventdate = {2014-06-10/2014-06-14},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Performance Improvement of UMTS Uplink Beamsteering with Limited Feedback at Higher Terminal Velocity by Designing Adapted Algorithms},
    venue = {Sydney, Australia},
    }
  • D. Vlad, G. Fischer, and M. Hänel, "Commissioning And First Beam Measurements With A New Beam Diagnostics For Medical Electron Accelerators" in Proceedings of the International Particle Accelerator Conference, Dresden, Germany, 2014. [Bibtex]
    @inproceedings{vlad2014,
    author = {Vlad, Daniel and Fischer, Georg and Hänel, Marc},
    booktitle = {Proceedings of the International Particle Accelerator Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060093},
    year = {2014},
    month = {06},
    day = {15},
    eventdate = {2014-06-15/2014-06-20},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Commissioning And First Beam Measurements With A New Beam Diagnostics For Medical Electron Accelerators},
    venue = {Dresden, Germany},
    }
  • [DOI] F. Trenz, M. Hofmann, R. Weigel, G. Fischer, and D. Kissinger, "Compact 2-28 GHz Planar Multi-Octave Bandwidth Wilkinson Power Dividers" in 2014 IEEE MTT-S International Microwave Symposium (IMS), Tampa, Florida, USA, 2014, pp. 1-4. [Bibtex]
    @inproceedings{trenz2014,
    abstract = {In this paper, two broadband Wilkinson power dividers in microstrip technology are presented. A broadband operation from 2 to 28 GHz could be achieved by a multisectional layout. The dividers differ in the number of cascaded steps, which allows application dependent usage. Furthermore, the dividers make use of commercially available, surface mounted thinfilmresistors, allowing a straightforward implementation. The maximum occupied area is around 30mm2 for the longer version and around 16mm2 for the shorter version. Measurements show a matching better than 13 dB and an isolation of better than 10 dB over the whole frequency range. The achieved bandwidth ratio of 14:1 represents, in combination with the compact layout, the highest ratio for Wilkinson dividers published so far.},
    author = {Trenz, Florian and Hofmann, Maximilian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    language = {English},
    publisher = {IEEE},
    booktitle = {2014 IEEE MTT-S International Microwave Symposium (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060064},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/MWSYM.2014.6848660},
    eventdate = {2014-06-01/2014-06-06},
    eventtitle = {IEEE MTT-S International Microwave Symposium},
    faupublication = {yes},
    keywords = {Wilkinson power divider; broadband},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Compact 2-28 GHz Planar Multi-Octave Bandwidth Wilkinson Power Dividers},
    type = {Konferenzschrift},
    venue = {Tampa, Florida, USA},
    }
  • [DOI] J. Brendel, S. Rieß, S. Schröter, and G. Fischer, "Noise Floor Dependent Data Fusion for Reliable REM Generation with a Spectrum Sensing Grid" in IEEE Symposium on Computers and Communications, Funchal, Portugal, 2014. [Bibtex]
    @inproceedings{brendel2014,
    abstract = {For several years the cognitive radio (CR) technology is under research as promising solution supporting the efficient utilization of the scarce radio frequency spectrum. The cognitive cycle enables the adaptation of operating parameters according to observations made from the environment. A radio environment map (REM) which contains data from spectrum sensing devices was identified to be an adequate tool to realize CR systems. In this contribution the challenges in generating a REM from sensor nodes with limited dynamic range is pointed out. Afterwards, the noise floor dependent data fusion (NDDF) algorithm is proposed. It is able to generate a reliable REM in a fusion center of a sensing grid. The algorithm merges spectrum measurements from collocated sensor nodes to reduce the amount of data whilst preserving all advantages gained from macro diversity by taking into account the noise floor of each sensor. The algorithm has been verified with measurements in the laboratory and a measurement study at the fairground of Berlin shows the applicability of the NDDF algorithm.},
    author = {Brendel, Johannes and Rieß, Steffen and Schröter, Simon and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE Symposium on Computers and Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060068},
    year = {2014},
    month = {06},
    day = {23},
    doi = {10.1109/ISCC.2014.6912496},
    eventdate = {2014-06-23/2014-06-26},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Noise Floor Dependent Data Fusion for Reliable REM Generation with a Spectrum Sensing Grid},
    venue = {Funchal, Portugal},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A 20-Gbps Low Jitter Analog Clock Recovery Circuit for Ultra Wide Band Radio Systems" in IEEE International Symposium on Circuits and Systems, Melbourne, Australia, 2014, pp. 1516-1519. [Bibtex]
    @inproceedings{hamouda2014a,
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {IEEE International Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060084},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/ISCAS.2014.6865435},
    eventdate = {2014-06-01/2014-06-05},
    faupublication = {yes},
    keywords = {PLL,UWB,Radio,radar},
    pages = {1516--1519},
    peerreviewed = {Yes},
    title = {A 20-Gbps Low Jitter Analog Clock Recovery Circuit for Ultra Wide Band Radio Systems},
    venue = {Melbourne, Australia},
    }
  • [DOI] M. Hamouda, B. Lämmle, G. Fischer, R. Weigel, and T. Ußmüller, "A Cross Correlation Based Clock Synchronization up to 10GHz for Ultra-Wideband Sensing Systems" in IEEE International Microwave Symposium, Tampa Bay, Florida, 2014. [Bibtex]
    @inproceedings{hamouda2014b,
    abstract = {This paper presents a cross correlation based synchronization architecture between the clock of the receiver and the transmitter for ultra-wideband radio systems. The designed architecture is based on M-sequence signals instead of the conventional impulse signals. The M-sequence generator and the analog correlation circuit are fabricated on chip using a low cost 0.25µm 95GHz fmax SiGe-HBT-BiCMOS process technology. The chip is mounted on a printed circuit board (PCB) with a commercial voltage controlled oscillator. The measurement results show a low phase noise of the VCO of -66dBc/Hz at 1KHz offset and an rms jitter of 1.6ps for a 10GHz frequency and a bit rate of 20Gb/s.},
    author = {Hamouda, Mohamed and Lämmle, Benjamin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060086},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/MWSYM.2014.6848541},
    eventdate = {2014-06-01/2014-06-06},
    eventtitle = {2014 IEEE MTT-S International Microwave Symposium (IMS2014)},
    faupublication = {yes},
    keywords = {UWB},
    peerreviewed = {Yes},
    title = {A Cross Correlation Based Clock Synchronization up to 10GHz for Ultra-Wideband Sensing Systems},
    url = {http://ieeexplore.ieee.org/document/6848541/},
    venue = {Tampa Bay, Florida},
    }
  • J. Nehring, G. Fischer, R. Weigel, and D. Kissinger, "An 8-32GHz Frequency Synthesizer based on a Wideband VCO Array with Bandwidth Extension Stage" in German Microwave Conference (Gemic), Aachen, 2014, pp. 1-4. [Bibtex]
    @inproceedings{nehring2014a,
    abstract = {This paper proposes a wideband signal source covering a bandwidth of two octaves from 8 GHz to 32 GHz. The system is based on an array of three wideband voltage controlled oscillators (VCOs) for octave wide frequency syn- thesis and a post-synthesis stage which extends the bandwidth by another octave. The circuits were fabricated in a 0.35 µm SiGe bipolar technology with an ft/fmax= 170/250GHz. The VCO tuning ranges are 28.9 %, 26.2 % and 24.7 % respectively. The average output power was measured to be -3.5 dBm. The single-sideband phase noise at 1 MHz offset has an average value of -100 dBc/Hz over the entire bandwidth of two octaves. The system blocks VCO array, bandwidth extension and output buffer consume a power of 175 mW, 277 mW and 150 mW.},
    author = {Nehring, Johannes and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {VDE},
    booktitle = {German Microwave Conference (Gemic)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060136},
    year = {2014},
    month = {03},
    day = {10},
    eventdate = {2014-03-10/2014-03-24},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {An 8-32GHz Frequency Synthesizer based on a Wideband VCO Array with Bandwidth Extension Stage},
    venue = {Aachen},
    }
  • M. A. Sedaghat, R. Müller, and G. Fischer, "A novel single RF-transmitter for massive MIMO" in 18th Int’l ITG Workshop on Smart Antennas, Erlangen, Germany, 2014. [Bibtex]
    @inproceedings{sedaghat2014,
    author = {Sedaghat, Mohammad Ali and Müller, Ralf and Fischer, Georg},
    language = {English},
    booktitle = {18th Int’l ITG Workshop on Smart Antennas},
    cris = {https://cris.fau.de/converis/publicweb/publication/1044685},
    year = {2014},
    month = {03},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A novel single RF-transmitter for massive MIMO},
    type = {Konferenzschrift},
    venue = {Erlangen, Germany},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "Ultra Wide Band Power Amplifier for Miniaturized Antennas" in International Wireless Symposium (IWS), Xian, China, 2014, pp. 1-4. [Bibtex]
    @inproceedings{hamouda2014,
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {International Wireless Symposium (IWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060079},
    year = {2014},
    month = {03},
    day = {24},
    doi = {10.1109/IEEE-IWS.2014.6864260},
    eventdate = {2014-03-24/2014-03-26},
    faupublication = {yes},
    keywords = {UWB,amplifier},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Ultra Wide Band Power Amplifier for Miniaturized Antennas},
    venue = {Xian, China},
    }
  • [DOI] G. Gottardo, G. Donati, C. Musolff, R. Weigel, and G. Fischer, "Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends" in German Microwave Conference, Aachen, Germany, 2014, pp. 1-4. [Bibtex]
    @inproceedings{gottardo2014,
    abstract = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. In order to reduce the size of these filters a novel hybrid system using a power amplifier and a negative digital feedback for frequency band GSM900 is studied. A model to describe the hybrid system is investigated and the relation between phase and resonance peaks in the transfer function is described. An attenuation of 5.4 dB for the closed loop transfer function is reached. The stability condition of the system is here presented using Nyquist criterion as an important step for its future feasibility.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060096},
    year = {2014},
    month = {03},
    day = {10},
    doi = {10.1109/MMM.2013.2288713},
    eventdate = {2014-03-10/2014-03-12},
    faupublication = {yes},
    keywords = {Active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends},
    venue = {Aachen, Germany},
    }
  • [DOI] J. Röber, A. Bänisch, T. Ußmüller, G. Fischer, and R. Weigel, "Frequency Synthesizer for Digital Satellite Radio Receiving Systems" in IEEE International Wireless Symposium (IWS) 2014, Xi'an China, 2014, pp. 1-4. [Bibtex]
    @inproceedings{roeber2014,
    abstract = {This paper describes the design and verification of phase lock loop (PLL) components within the framework of a front-end for digital satellite radio diversity reception. First, the functionality of the implemented PLL is described by a block diagram. Second, individual PLL components are presented and analysed. Altogether a voltage controlled oscillator (VCO), an automatic amplitude control (AAC), a buffer stage, a TSCP logic as well as a DCVSL-R high-speed by-two-divider, a multimodulus divider (MMD), and a phase-frequency detector are developed. The frequency tuning range of the PLL is between 4.34 and 4.70 GHz and hence the VCO tuning range has to be around 4 to 5 GHz. Beyond this, the VCO’s post-layout phase noise is -100.50 dBc/Hz at 1 MHz under nominal environmental conditions and the post-layout yield analysis predicts 99.773%. Additionally, the VCO and the AAC are connected. Due to that additional AAC feedback circuit, the current consumption as well as the VCO output amplitude decrease. The overall system simulation shows the settling process of the PLL for the tri-state and the five-state mode of the PFD. Finally the VCO performance is compared with other state-of-the-art LC-VCOs.},
    author = {Röber, Jürgen and Bänisch, Andreas and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE International Wireless Symposium (IWS) 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060105},
    year = {2014},
    month = {03},
    day = {24},
    doi = {10.1109/IEEE-IWS.2014.6864267},
    eventdate = {2014-03-24/2014-03-26},
    eventtitle = {2014 IEEE International Wireless Symposium (IWS 2014)},
    faupublication = {yes},
    keywords = {PLL; Synthesizer; Mixed-Signal; VCO; AAC; Behavioral Modeling; Diversity},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Frequency Synthesizer for Digital Satellite Radio Receiving Systems},
    type = {Konferenzschrift},
    url = {http://ieeexplore.ieee.org/document/6864267/},
    venue = {Xi'an China},
    }
  • [DOI] A. Schwarzmeier, J. Besser, R. Weigel, G. Fischer, and D. Kissinger, "A Compact Back-Plaster Sensor Node for Dementia and Alzheimer Patient Care" in 2014 IEEE Sensors Applications Symposium (SAS 2014), Queenstown, New Zealand, 2014, pp. 75-78. [Bibtex]
    @inproceedings{schwarzmeier2014,
    abstract = {Abstract--- This paper presents a compact and highly integrated back-plaster sensor node equipped with seamless localization (in-door and out-door) using assisted GPS and bluetooth localization, activity classification and fall detection as well an GSM module providing a GPRS connection to a server infrastructure for supporting dementia and Alzheimer patients within their daily life. The innovative and durable design as a hermetic rubber-sealed, waterproof and sanitizable back-plaster ensures optimum wearing comfort for the patient as well as reliable fall-detection. In addition with an internet server infrastructure the described plaster sensor node allows to inform relatives or professional care staff in case of an emergency and help to enhance the quality of life by increasing the sense of feeling secure.},
    author = {Schwarzmeier, Andre and Besser, J. and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {2014 IEEE Sensors Applications Symposium (SAS 2014)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060074},
    year = {2014},
    month = {02},
    doi = {10.1109/SAS.2014.6798920},
    faupublication = {yes},
    keywords = {Index Terms--- remote health monitoring; medical information system; fall-detection; localization; sensor processing; data fusion},
    pages = {75--78},
    peerreviewed = {Yes},
    title = {A Compact Back-Plaster Sensor Node for Dementia and Alzheimer Patient Care},
    venue = {Queenstown, New Zealand},
    }
  • [DOI] C. Musolff, M. Kamper, Z. Abou-Chahine, and G. Fischer, "Linear and efficient Doherty PA Revisited", IEEE Microwave Magazine, vol. 15, iss. 1, pp. 73-79, 2014. [Bibtex]
    @article{musolff2014,
    author = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060061},
    year = {2014},
    month = {02},
    doi = {10.1109/MMM.2013.2288713},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {power amplifier; doherty; linear; 3.5GHz; IMD; RFPA; PA; student design competition},
    number = {1},
    pages = {73--79},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Linear and efficient Doherty PA Revisited},
    volume = {15},
    }
  • [DOI] A. Schwarzmeier, R. Weigel, G. Fischer, and D. Kissinger, "A Low-Power Fall Detection and Activity Monitoring System for Nursing Facilities and Hospitals" in IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014), Newport Beach, CA, USA, 2014, pp. 28-30. [Bibtex]
    @inproceedings{schwarzmeier2013,
    abstract = {Abstract--- This paper presents a fall detection and activity monitoring system comprised of a server software for data management, multiple UHF RFID readers and an energy efficient, small and lightweight semi-passive UHF RFID sensor tag. The system is able to gather activity and indoor localization data of several persons wearing just one sensor tag, making it particularly suitable for the use in nursing facilities or hospitals. The implemented fall detection alerts nursing staff in case of a detected fall and allows quick intervention in case of an emergency.},
    author = {Schwarzmeier, Andre and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060073},
    year = {2014},
    month = {01},
    doi = {10.1109/BIOWIRELESS.2014.6827736},
    faupublication = {yes},
    keywords = {Index Terms--- semi active UHF RFID; remote fall monitoring; sensor tag; localization; Ambient Assisted Living (AAL); sensor processing},
    pages = {28--30},
    peerreviewed = {Yes},
    title = {A Low-Power Fall Detection and Activity Monitoring System for Nursing Facilities and Hospitals},
    venue = {Newport Beach, CA, USA},
    }
  • [DOI] S. Glock, J. Rascher, B. Sogl, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "A Semi-Physical Power Amplifier Behavioral Model Capable of Predicting Gain Expansion Effects" in IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications, Newport Beach, CA, USA, 2014, pp. 1-3. [Bibtex]
    @inproceedings{glock2014,
    abstract = {A novel semi-physical power amplifier (PA) behavioral model (BM) that describes the input-output characteristic of PAs exhibiting gain expansion (GE) is introduced. The accurate prediction of GE is of particular importance because GE typically improves the power added efficiency (PAE) at high input powers. Though, GE impacts the spectral regrowth. Therefore, BMs that are capable of predicting GE, like the one introduced in this work, are highly desirable. In a case study, the proposed model is employed to predict the AM-AM distortions of a GaAs PA designed for LTE applications. Excellent agreement between measurement and simulation results is obtained. The computational efficient model allows system-level simulations of advanced transmitter systems in order to optimize their modes of operation.},
    author = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060054},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/PAWR.2014.6825726},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A Semi-Physical Power Amplifier Behavioral Model Capable of Predicting Gain Expansion Effects},
    venue = {Newport Beach, CA, USA},
    }
  • [DOI] S. Schröter, S. Rieß, R. Weigel, and G. Fischer, "Enhancing Open Loop Beamsteering Performance for the Uplink of UMTS/HSPA+ under Discontinuous Transmission" in IEEE Radio and Wireless Symposium (RWS), Newport Beach, USA, 2014, pp. 244-246. [Bibtex]
    @inproceedings{schroeter2014,
    abstract = {So called open loop transmit diversity algorithms for the uplink of UMTS use the power control commands as feedback to iteratively determine the antenna weights. The algorithms presented in literature so far are designed for continuous transmission. The UMTS standard, however, also allows discontinuous uplink transmission (DTX), which impairs the performance of these algorithms. This paper studies these impairments and proposes a method to design transmit diversity algorithms with improved performance in a DTX scenario. With such improved algorithms, the transmit power gain is 1.4 dB in DTX, which is an improvement of 0.7 dB over conventional non-DTX diversity algorithms.},
    author = {Schröter, Simon and Rieß, Steffen and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE Radio and Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060114},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/RWS.2014.6830142},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {244--246},
    peerreviewed = {Yes},
    title = {Enhancing Open Loop Beamsteering Performance for the Uplink of UMTS/HSPA+ under Discontinuous Transmission},
    venue = {Newport Beach, USA},
    }
  • [DOI] A. Elmaghraby, G. Fischer, R. Weigel, and T. Ußmüller, "An inductor-less LTE receiver using an 8-path filter for TX leakage suppression" in IEEE Silicon Monolithic Integrated Circuits in RF Systems, Newport Beach, USA, 2014, pp. 38-40. [Bibtex]
    @inproceedings{elmaghraby2014,
    author = {Elmaghraby, Ahmed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {IEEE Silicon Monolithic Integrated Circuits in RF Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060097},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/SIRF.2014.6828503},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {38--40},
    peerreviewed = {Yes},
    title = {An inductor-less LTE receiver using an 8-path filter for TX leakage suppression},
    venue = {Newport Beach, USA},
    }
  • S. Rieß, J. Brendel, A. Stöckle, S. Schröter, R. Rose, and G. Fischer, The Spectrum Sensing Network: Information Acquisition for the Cognitive PMSE System, Shaker Verlag, 2014.. [Bibtex]
    @book{riess2014,
    abstract = {Accessing the frequency spectrum in a dynamic way has been discussed since several years. The Cognitive Radio (CR) technology was identi ed as enabler in order to use the spectral resources in a more e cient way. However, to guarantee interference free operation between multiple services, spectrum sensing plays a major role of designing such a system. This contribution focuses on the realization of the Spectrum Sensing Network (SSN) that has been developed during a research project in Germany. The SSN involves multiple sensor nodes consisting of a receiver with broadband antenna which are connected to a central controller that is in charge of handling the interfaces and acquired data of the SSN. With this setup it is possible to generate an accurate radio environment map, i.e. power over frequency, time and location, in the UHF frequency range from 470 to 870 MHz. After a short introduction to the system requirements and a project overview, attention is paid to the necessary components of such a distributed sensing grid. The measurement results and the discussion of possible advantages of a SSN show the added value for a CR system. Although, the application and demonstration was based on the improvement of operating conditions for Professional Wireless Microphone Systems (PWMS), the originated eld trial platform is open for reasearch activities related to other CR systems in this frequency range.},
    author = {Rieß, Steffen and Brendel, Johannes and Stöckle, Andreas and Schröter, Simon and Rose, Richard and Fischer, Georg},
    publisher = {Shaker Verlag},
    booktitle = {tbd.},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060081},
    year = {2014},
    faupublication = {yes},
    keywords = {PMSE; cognitive radio; spectrum sensing; sensing network; sensing grid; scanning controller; scanning receiver; scanning antenna; radio environment map; data fusion},
    peerreviewed = {No},
    title = {The Spectrum Sensing Network: Information Acquisition for the Cognitive PMSE System},
    type = {Band aus einer Reihe},
    }
  • [DOI] R. Müller, M. A. Sedaghat, and G. Fischer, "Load modulated massive MIMO" in 2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014, 2014, pp. 622-626. [Bibtex]
    @inproceedings{mueller2014,
    abstract = {We propose a new hardware architecture for cost-and size-effective implementation of massive MIMO transmitters based on load modulation that is fully compatible with standard receiver architectures. With load modulation, a massive MIMO transmitter can be driven by a single power amplifier operating at constant envelope. The various data streams are modulated onto the antennas elements by varying the complex impedances of the various antenna circuits at symbol rate. The law of large numbers ensures that the common power source is matched to the parallel concatenation of the various antenna circuits, if the number of antenna elements is very large. For 100 antenna elements that are supposed to transmit Gaussian-like signals, e.g. due to OFDM modulation and/or precoding, the crest factor is only 1.2 dB at a clipping probability of 0.1%. In that case, load modulation reduces the average consumed power and the amplifier peak power by 49% and 79%, respectively, as compared to classical distributed amplifiers with voltage modulation. Furthermore, one class F amplifier can be used to replace 100 class A/B amplifiers. Mutual antenna coupling need not be addressed by a physical matching network, but can be mitigated dynamically by digital signal processing in baseband without additional hardware. This allows for closer antenna spacing as in architectures with distributed amplifiers.},
    author = {Müller, Ralf and Sedaghat, Mohammad Ali and Fischer, Georg},
    language = {English},
    publisher = {Institute of Electrical and Electronics Engineers Inc.},
    booktitle = {2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1043986},
    year = {2014},
    doi = {10.1109/GLOBALSIP.2014.7032192},
    faupublication = {yes},
    isbn = {9781479970889},
    journaltitle = {2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014},
    keywords = {Antenna coupling; Crest factor; Load modulation; Massive MIMO; Multi-antenna systems; Power amplifier},
    pages = {622--626},
    peerreviewed = {Yes},
    title = {Load modulated massive MIMO},
    type = {undefined},
    url = {https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84949926627&origin=inward},
    }
  • [DOI] M. A. Sedaghat, R. Müller, and G. Fischer, "Broadcast precoding for massive MIMO subject to an instantaneous total power constraint" in 2014 IEEE Global Communications Conference, GLOBECOM 2014, 2014, pp. 1637-1641. [Bibtex]
    @inproceedings{sedaghat2014a,
    abstract = {We design a new precoding scheme for massive multiple-input multiple-output (MIMO) systems subject to an instantaneous total power constraint. Unlike the classical way of designing precoders, we use a more realistic model for power amplifiers by considering their maximum power. The considered power constraint is applicable in the single-RF MIMO transmitter which has been proposed recently for massive MIMO systems. For sake of analysis, i.i.d. Gaussian signals are considered. It is shown that the designed precoding scheme results in a good performance in terms of signal to interference plus noise ratio (SINR) at the receivers and power efficiency at the transmitter. It is shown that the power efficiency utilizing this precoding scheme is almost equal to the case of constant envelope signals. Since the proposed precoding limits the total transmit power, there is no need for peak-to-average power ratio (PAPR) reduction algorithms.},
    author = {Sedaghat, Mohammad A. and Müller, Ralf and Fischer, Georg},
    publisher = {Institute of Electrical and Electronics Engineers Inc.},
    booktitle = {2014 IEEE Global Communications Conference, GLOBECOM 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1043984},
    year = {2014},
    doi = {10.1109/GLOCOM.2014.7037043},
    faupublication = {yes},
    isbn = {9781479935116},
    journaltitle = {2014 IEEE Global Communications Conference, GLOBECOM 2014},
    keywords = {crest factor; massive MIMO; matching networks; Multiple antennas; multiple-input multiple-output (MIMO) systems; peak-to-average power ratio (PAPR)},
    pages = {1637--1641},
    peerreviewed = {Yes},
    title = {Broadcast precoding for massive MIMO subject to an instantaneous total power constraint},
    type = {undefined},
    url = {https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84949922731&origin=inward},
    }
  • A. Tobola, O. Korpok, H. Leutheuser, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, A. Heuberger, and G. Fischer, "System Design Impacts on Battery Runtime of Wearable Medical Sensors" in Proceedings of International Conference on Mobile and Information Technologies in Medicine and Health, Czech Technical University, Prague, 2014, pp. 1-4. [Bibtex]
    @inproceedings{tobola2014,
    author = {Tobola, Andreas and Korpok, Oliver and Leutheuser, Heike and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Heuberger, Albert and Fischer, Georg},
    booktitle = {Proceedings of International Conference on Mobile and Information Technologies in Medicine and Health},
    cris = {https://cris.fau.de/converis/publicweb/publication/1026169},
    year = {2014},
    eventtitle = {MobileMed 2014},
    faupublication = {yes},
    isbn = {9788001056370},
    pages = {1--4},
    title = {System Design Impacts on Battery Runtime of Wearable Medical Sensors},
    type = {Konferenzschrift},
    venue = {Czech Technical University, Prague},
    }

2013

  • N. Franchi, G. Fischer, and R. Weigel, "Adaptive Automobilfunksysteme" in Embedded Software Engineering Kongress, Sindelfingen, 2013, pp. 56-62. [Bibtex]
    @inproceedings{franchi2013c,
    abstract = {Traditionell werden in der Automobilbranche bis dato Systeme mit ausschließlich dedizierten, integrierten Chiplösungen, die jeweils nur auf einen Kommunikationsstandard spezialisiert sind, entwickelt. Im Gegensatz dazu wird in diesem Beitrag ein wegweisendes Integrations- und Prototypingkonzept, aufbauend auf dem Software-Defined-Radio-Prinzip, vorgestellt bei dem eine frei programmierbare Kommunikationsplattform eine Vielzahl unterschiedlicher Funkstandards auf ein und derselben Hardware abbilden kann. Ob diese Funkplattform nun verkehrstelematische Dienste (z.B. eCall-Notruffunktion, Car-2-X-Kommunikation) oder bspw. eine Mobilfunkanbindung (UMTS, LTE) ermöglicht, wird allein durch die Konfiguration der eingebetteten Software und digitalen Schaltkreise festgelegt. Am Beispiel der WLAN-Funkstandards IEEE 802.11b/p sollen anhand eines Demonstrators sowohl die Stärken des Prototypingkonzepts als auch des universellen Funkplattformansatzes für Funksysteme im Fahrzeug verdeutlicht werden.},
    author = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    publisher = {Vogel Business Media},
    booktitle = {Embedded Software Engineering Kongress},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060013},
    year = {2013},
    month = {12},
    faupublication = {yes},
    keywords = {Software Defined Radio; Wireless Vehicular Communication Systems; Car-to-X; IEEE 802.11p},
    pages = {56--62},
    peerreviewed = {unknown},
    title = {Adaptive Automobilfunksysteme},
    venue = {Sindelfingen},
    }
  • [DOI] S. Rieß, J. Brendel, and G. Fischer, "Model-Based Implementation for the Calculation of Power Spectral Density in an FPGA System" in IEEE International Conference on Signal Processing and Communication Systems (ICSPCS), Gold Coast, Australia, 2013. [Bibtex]
    @inproceedings{riess2013c,
    abstract = {Cognitive Radio (CR) systems equipped with a spectrum sensing unit are able to access the radio frequency spectrum in a dynamic manner. This paper presents a model-based design approach and implementation for the calculation of the Power Spectral Density (PSD) of the received signal in a spectrum scanner. Design parameters based on the requirements of the complete CR system as well as the signal processing steps for the PSD calculation are described. The signal processing comprises the implementation of a control unit, selectable window functions, the Fast Fourier Transformation, the calculation of the magnitude, selectable number of averages for the calculation of peak and mean power values as well as the logarithmic representation of the spectrum. The presented processing block is integrated as part of an embedded system in an FPGA. The simulation and measurement results demonstrate and proof the functionality of the developed block with the shown design flow.},
    author = {Rieß, Steffen and Brendel, Johannes and Fischer, Georg},
    booktitle = {IEEE International Conference on Signal Processing and Communication Systems (ICSPCS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060044},
    year = {2013},
    month = {12},
    doi = {10.1109/ICSPCS.2013.6723929},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Model-Based Implementation for the Calculation of Power Spectral Density in an FPGA System},
    venue = {Gold Coast, Australia},
    }
  • [DOI] I. Nasr, B. Lämmle, K. Aufinger, G. Fischer, R. Weigel, and D. Kissinger, "A 70 to 90 GHz High-Linearity Multi-Band Quadrature Receiver in 0.35 μm SiGe Technology", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 12, pp. 4600-4612, 2013. [Bibtex]
    @article{nasr2013b,
    abstract = {An integrated frequency agile quadrature E-band receiver is presented in this paper. The complete receiver is realized in a commercial 0.35µm SiGe:C technology with an ft=fmax of 170/250GHz. The receiver covers the two point to point communication bands from 71 to 76 GHz and 81 to 86 GHz and the automotive radar band at 77 GHz. A wide tuning range modified Colpitts oscillator provides an LO tuning range > 30%. A two stage constant phase RC polyphase network is implemented to provide wide-band quadrature (IQ) LO signals. The measured phase imbalance of the network stays below 8 over the receiver’s frequency range. In addition the chip includes a wide-band LNA, Wilkinson power divider, down conversion mixers and frequency prescaler. Each of the chip’s receiver I/Q paths shows a measured conversion gain above 19 dB and an input referred 1 dB compression point of -22 dBm. The receiver’s measured noise figure stays below 11 dB over the complete frequency range. Furthermore, the receiver has a measured IF bandwidth of 6 GHz. The complete chip including prescaler draws a current of 230mA from a 3.3V supply, and consumes a chip area of 1628µm x 1528 µm.},
    author = {Nasr, Ismail and Lämmle, Benjamin and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059977},
    year = {2013},
    month = {12},
    doi = {10.1109/TMTT.2013.2285280},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {12},
    pages = {4600--4612},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A 70 to 90 GHz High-Linearity Multi-Band Quadrature Receiver in 0.35 μm SiGe Technology},
    volume = {61},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Eßel, J. Heidrich, G. Fischer, and R. Weigel, "Remote Powered Medical Implants" in MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), , Singapore, 2013, pp. 1-3. [Bibtex]
    @inproceedings{ussmueller2013b,
    author = {Ußmüller, Thomas and Brenk, Daniel and Eßel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    booktitle = {MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060017},
    year = {2013},
    month = {12},
    day = {09},
    doi = {10.1109/IMWS-BIO.2013.6756186},
    eventdate = {2013-12-09/2013-12-11},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Remote Powered Medical Implants},
    venue = {, Singapore},
    }
  • [DOI] S. Glock, J. Rascher, B. Sogl, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "A Novel Power Amplifier Behavioral Model for Improving the Linearity-Efficiency Tradeoff" in International Microwave and RF Conference (IMaRC), New Delhi, India, 2013, pp. 1-4. [Bibtex]
    @inproceedings{glock2013c,
    abstract = {This paper focuses on a novel power amplifier (PA) semi-physical behavioral model (BM) to study the linearityefficiency trade-off in modern wireless transmitter systems. While the behavioral models known in the literature mainly focus on the precise description of the PA nonlinearity in terms of amplitudemodulation- to-amplitude-modulation (AM-AM) and amplitudemodulation- to-phase-modulation (AM-PM) distortions, the model introduced here, also predicts the DC current flowing from the power supply to the PA. This allows to optimize the battery current while keeping the out-of-channel interference within specification limits. In a case study, the DC current and the amplitude distortions of a PA, designed for IEEE 802.11b/g/n applications are predicted with a normalized mean square error (NMSE) of -39.92 dB and -47.07 dB, respectively.},
    author = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {International Microwave and RF Conference (IMaRC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059917},
    year = {2013},
    month = {12},
    doi = {10.1109/IMARC.2013.6777718},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A Novel Power Amplifier Behavioral Model for Improving the Linearity-Efficiency Tradeoff},
    venue = {New Delhi, India},
    }
  • [DOI] J. Brendel, A. Schmidt, and G. Fischer, "A Link Quality Indicator for analog FM Transmission Systems" in IEEE Conference on Signal Processing and Communication Systems, Gold Coast, Australia, 2013. [Bibtex]
    @inproceedings{brendel2013b,
    abstract = {This work describes a method to determine the link quality of analog frequency modulated (FM) transmission systems (especially wireless microphones) with the help of digital signal processing. We exploit the amplitude variations of a disturbed FM transmission to estimate the signal to interference plus noise ratio (SINR) of the received signal. Furthermore, the statistical measure kurtosis is used to determine the type of interference. After the theoretic description and derivation of the algorithms, the approach is confirmed with simulations. Finally, measurements and results of a hardware implementation show the applicability of the presented link quality estimator for instance in cognitive wireless microphone systems.},
    author = {Brendel, Johannes and Schmidt, Axel and Fischer, Georg},
    booktitle = {IEEE Conference on Signal Processing and Communication Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059984},
    year = {2013},
    month = {12},
    doi = {10.1109/ICSPCS.2013.6723964},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Link Quality Indicator for analog FM Transmission Systems},
    venue = {Gold Coast, Australia},
    }
  • S. Rieß, J. Brendel, S. Schröter, and G. Fischer, "Intelligente Funkmikrofone - Spektrumserfassung für Cognitive-Radio-Systeme", 2013. [Bibtex]
    @other{riess2013a,
    abstract = {Die Hersteller von professioneller, drahtloser Produktionstechnik sehen sich zunehmend mit steigenden Anforderungen für den interferenzfreien Betrieb ihrer Systeme konfrontiert. Die Gründe dafür liegen in der Digitalen Dividende sowie Änderungen in der Regulierung durch die Bundesnetz-agentur im Frequenzbereich von 470-862 MHz. Ein Ansatz zur Lösung dieser Problematik stellt die Cognitive-Radio-Technologie dar, wobei die vorherrschende Funkumgebung überwacht und daraus ggf. die Entscheidung für einen Frequenzwechsel im Falle einer Störung getroffen wird.},
    author = {Rieß, Steffen and Brendel, Johannes and Schröter, Simon and Fischer, Georg},
    booktitle = {DESIGN&ELEKTRONIK},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060043},
    year = {2013},
    month = {11},
    day = {27},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Intelligente Funkmikrofone - Spektrumserfassung für Cognitive-Radio-Systeme},
    type = {online publication},
    url = {http://www.elektroniknet.de/kommunikation/wireless/artikel/103608},
    }
  • M. Hamouda, F. Scotto di Clemente, M. Hein, G. Fischer, R. Weigel, and T. Ußmüller, "Ultra Wide Band Low-Power Amplifier Integrated on Miniaturized Antenna for Biomedical Applications" in European Radar Conference (EuRAD), Nuremberg, Germany, 2013, pp. 423-426. [Bibtex]
    @inproceedings{hamouda2013,
    author = {Hamouda, Mohamed and Scotto di Clemente, Francesco and Hein, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059993},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    pages = {423--426},
    peerreviewed = {Yes},
    title = {Ultra Wide Band Low-Power Amplifier Integrated on Miniaturized Antenna for Biomedical Applications},
    venue = {Nuremberg, Germany},
    }
  • [DOI] A. Radwan, G. Fischer, R. Weigel, and D. Kissinger, "A broadband 24 GHz bandwidth 54 dB gain 180-mW amplifier employing common-collector combinded with capacitive controlled cross-coupled feedback in 0.35 um SiGe technology" in IEEE Bipolar/BiCMOS Circuits and Technology Meeting, Bordeaux, France, 2013, pp. 115-118. [Bibtex]
    @inproceedings{gharib2013,
    author = {Radwan, Ahmed and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Bipolar/BiCMOS Circuits and Technology Meeting},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059939},
    year = {2013},
    month = {10},
    doi = {10.1109/BCTM.2013.6798157},
    faupublication = {yes},
    pages = {115--118},
    peerreviewed = {Yes},
    title = {A broadband 24 GHz bandwidth 54 dB gain 180-mW amplifier employing common-collector combinded with capacitive controlled cross-coupled feedback in 0.35 um SiGe technology},
    venue = {Bordeaux, France},
    }
  • S. Glock, R. Rosales, F. Reutelhuber, M. Glaß, J. Teich, G. Fischer, R. Weigel, and T. Ußmüller, "Scenario-Based Energy Estimation of Heterogeneous Integrated Systems at System Level" in European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference, Nuremberg, Germany, 2013, pp. 342-345. [Bibtex]
    @inproceedings{glock2013b,
    abstract = {One of the most important figures of merit concerning mobile devices is their energy efficiency. However, the modeling of such systems is mainly focused on the functional aspects, but not on the power consumption. Therefore, power estimations can only be accomplished late in the design process, after all architectural decisions have been taken. This might lead to designs that are not optimal with respect to power consumption. To overcome these limitations, this article proposes an efficient and flexible power modeling methodology at system level for heterogeneous integrated systems, allowing to combine state-dependent and environmental dependent power models. In a case study, the energy consumption of an RF transceiver of a mobile phone is estimated in a real-life scenario, including the baseband module, the radio channel, and the base transceiver station in a simulative way. © 2013 European Microwave Association.},
    author = {Glock, Stefan and Rosales, Rafael and Reutelhuber, Franz and Glaß, Michael and Teich, Jürgen and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025889},
    year = {2013},
    month = {10},
    day = {07},
    eventdate = {2013-10-07/2013-10-10},
    eventtitle = {43rd European Microwave Conference (EuMC)},
    faupublication = {yes},
    pages = {342--345},
    peerreviewed = {Yes},
    title = {Scenario-Based Energy Estimation of Heterogeneous Integrated Systems at System Level},
    venue = {Nuremberg, Germany},
    }
  • [DOI] M. Gardill, K. Finkenzeller, W. Hinz, G. Fischer, R. Weigel, and A. Koelpin, "A Review and Comparative Study of On- and Off-Body Performance of Platform-Tolerant UHF RFID Tag Antennas" in 8th International Conference on Body Area Networks, Boston, MA, USA, 2013. [Bibtex]
    @inproceedings{gardill2013f,
    abstract = {This paper addresses the remote identifying of human subjects by means of UHF RFID tags. In particular, we provide a comprehensive review of recent approaches in the design of compact, platform-tolerant UHF RFID antennas for on- as well as off-body applications. We first categorize previously published antenna designs and interrelate the various approaches. We then provide detailed simulation results for several selected design approaches, and compare the performance of the proposed antenna structures when used in free-space, placed in proximity to a homogenous phantom half-space model, and when used on or in proximity to a layered elliptical body model. We provide a comparative study by evaluating all approaches using the same figure of merits, which are the power transfer and the estimated read range, evaluated in exactly the same simualtion environment for all approaches.},
    author = {Gardill, Markus and Finkenzeller, Klaus and Hinz, Walter and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {ICST},
    booktitle = {8th International Conference on Body Area Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060009},
    year = {2013},
    month = {10},
    doi = {10.4108/ICST.BODYNETS.2013.253614},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Review and Comparative Study of On- and Off-Body Performance of Platform-Tolerant UHF RFID Tag Antennas},
    venue = {Boston, MA, USA},
    }
  • J. Nehring, I. Nasr, G. Fischer, R. Weigel, and D. Kissinger, "A Single-Chip 15-32 GHz Signal Source in SiGe Bipolar Technology" in European Microwave Integrated Circuits Conference (EuMIC), Nürnberg, 2013. [Bibtex]
    @inproceedings{nehring2013,
    abstract = {This paper presents a single-chip octave-bandwidth signal source covering a frequency band from 15GHz to 32GHz. The circuit was fabricated in a 0.35 µm SiGe bipolar technology with an ft/fmax = 170/250GHz. An array of four crosscoupled voltage controlled oscillators with subsequent frequency ranges is implemented. The oscillator cores only draw 13mA from a 3.3V supply. Another 13mA is drawn by following buffer stages. A 4-to-1 multiplexing amplifier acts as a combiner providing the octave-wide bandwidth at a single differential output. The output power was measured to be between -2.5 dBm and 0.7 dBm. The signal source provides a good phase noise performance of -105 dBc/Hz at 15GHz and -96.8 dBc/Hz at 30GHz at an offset of 100MHz from the carrier frequencies. The overall circuit consumes a total power of 205mW and occupies a chip area of 1128 µm x 1028 µm.},
    author = {Nehring, Johannes and Nasr, Ismail and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {European Microwave Integrated Circuits Conference (EuMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059973},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-08},
    faupublication = {yes},
    keywords = {VCO; signal source; wideband; microwave; octave-wide bandwidth},
    peerreviewed = {Yes},
    title = {A Single-Chip 15-32 GHz Signal Source in SiGe Bipolar Technology},
    url = {http://ieeexplore.ieee.org/document/6687791/},
    venue = {Nürnberg},
    }
  • [DOI] J. Brendel, S. Rieß, R. Weigel, and G. Fischer, "A cognitive system for future‐proof wireless microphones: Concept, Implementation and Results" in 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS), Nis, Serbia, 2013. [Bibtex]
    @inproceedings{brendel2013a,
    abstract = {Since several years, 'cognitive radio' is given much attention in research and is seen as a future technology in communications. In this paper a cognitive radio system for Program Making and Special Event (PMSE) devices (e.g. wireless microphones) is presented and the results of a field test are discussed. First, we outline the challenges which the PMSE industry has to cope with and how changes in regulatory and the digital dividend in the TV UHF band has impact on the operation reliability of PMSE devices. Afterwards, a system using cognitive radio techniques to ensure the high audio quality requirements and interference free operation of PMSE devices under the previously mentioned circumstances is presented. Beside a general overview over the developed system we focus on a distributed spectrum sensing network as part of the cognitive information acquisition to monitor the current spectrum situation. The data is used by the cognitive engine to detect potential interferers and to trigger operation parameter changes (e.g. frequency or transmit power) of the PMSE devices to avoid link quality degradation. We present the built up sensor nodes for the spectrum measurement and the developed software to control the sensor nodes and to preprocess the measured data. Finally, the results, collected with the field test platform in the fairgrounds of Berlin, show convincingly how the developed cognitive system makes PMSE devices future‐proof.},
    author = {Brendel, Johannes and Rieß, Steffen and Weigel, Robert and Fischer, Georg},
    booktitle = {11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059985},
    year = {2013},
    month = {10},
    day = {16},
    doi = {10.1109/TELSKS.2013.6704934},
    eventdate = {2013-10-16/2013-10-19},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A cognitive system for future‐proof wireless microphones: Concept, Implementation and Results},
    venue = {Nis, Serbia},
    }
  • S. Rieß, J. Brendel, A. Stöckle, R. Rose, and G. Fischer, "Components and Implementation of a Spectrum Sensing Network for the UHF TV Band" in European Microwave Conference (EuMC), Nuremberg, Germany, 2013, pp. 1091-1094. [Bibtex]
    @inproceedings{riess2013,
    abstract = {Spectrum sensing is a major part for the implementation of Cognitive Radio (CR) systems in order to enable dynamic access to the radio frequency spectrum. This paper is about a Spectrum Sensing Network (SSN) which generates an accurate radio environment map (i.e. power over frequency, time and location) in the UHF TV band from 470–870 MHz. It consists of a distributed network of multiple receivers with a broadband antenna and a central data management and storage unit. This contribution focuses on the implementation of such a scanning network which has been setup as universal research platform in several halls at the fairground in Berlin. The SSN itself is part of a complex CR system for Professional Wireless Microphone Systems (PWMS) that is able to provide a dynamic frequency allocation of the connected radio links.},
    author = {Rieß, Steffen and Brendel, Johannes and Stöckle, Andreas and Rose, Richard and Fischer, Georg},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059997},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    pages = {1091--1094},
    peerreviewed = {Yes},
    title = {Components and Implementation of a Spectrum Sensing Network for the UHF TV Band},
    venue = {Nuremberg, Germany},
    }
  • A. Zohny, S. Leuschner, J. Rascher, S. Pinarello, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "Analog Compensation of AM-AM and AM-PM effects for HighEfficiency Stacked-FET Power Amplifiers in 65-nm Standard CMOS" in European Microwave Integrated Circuits Conference (EuMIC), Nürnberg, 2013, pp. 165-168. [Bibtex]
    @inproceedings{zohny2013a,
    abstract = {Simultaneously achieving high linearity and high power-added efficiency (PAE) is essential for power amplifiers (PA) operating with modern communication signals. The challenge is exacerbated by the low breakdown voltages of standard CMOS realizations. This work presents a low-complexity programmable analog scheme to compensate the strong AM-AM and AM-PM nonlinearities of the high-ruggedness stacked-cascode topology while maintaining high PAE. The proposed solution utilizes standard NMOS devices to achieve peak PAE of 60% at the 900 MHz band from a 3V supply. The compensation scheme manages to improve the output 1-dB compression point by up to 2 dB and keep the AM-PM variation within 5 degrees. The proposed method improves the linear output power (@ ACPR= -40 dBc) for a Class-AB power amplifier by up to 1.5 dB without compromising PAE or saturated output power},
    author = {Zohny, Amr and Leuschner, Stephan and Rascher, Jochen and Pinarello, Sandro and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {European Microwave Integrated Circuits Conference (EuMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060015},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-08},
    faupublication = {yes},
    keywords = {Power amplifier; Stacked FET; Stacked cascode; CMOS; linearization; ruggedness},
    pages = {165--168},
    peerreviewed = {Yes},
    title = {Analog Compensation of AM-AM and AM-PM effects for HighEfficiency Stacked-FET Power Amplifiers in 65-nm Standard CMOS},
    venue = {Nürnberg},
    }
  • [DOI] P. Jüschke, A. Pascht, and G. Fischer, "Neural Network based efficiency optimization method for RF Power Amplifiers with controllable Power Supply" in AFRICON, 2013, pp. 1-4. [Bibtex]
    @inproceedings{jueschke2013,
    author = {Jüschke, Patrick and Pascht, Andreas and Fischer, Georg},
    booktitle = {AFRICON},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059927},
    year = {2013},
    month = {09},
    day = {09},
    doi = {10.1109/AFRCON.2013.6757644},
    eventdate = {2013-09-09/2013-09-12},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Neural Network based efficiency optimization method for RF Power Amplifiers with controllable Power Supply},
    }
  • [DOI] S. Linz, M. Hofmann, G. Fischer, R. Weigel, and D. Kissinger, "A Multiband 2-Port Vector Network Analyzer based on Six-Port Junctions for Biomedical Measurement Applications between 6 GHz and 33 GHz" in 2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Turin, Italy, 2013, pp. 532-535. [Bibtex]
    @inproceedings{linz2013,
    abstract = {Concentration measurements of dissolved substances in fluids are of great interest for biomedical as well as industrial applications. In this work a multiband vector network analyzer is presented that is capable of determining phase variations due to changes in the concentration. A topology comprising two Six-Port networks optimized for the frequencies 6.6 GHz, 19.7GHz and 32.4GHz has been implemented. Measurement results show a characteristic change of the phase when increasing the glucose concentration in binary aqueous solutions.},
    author = {Linz, Sarah and Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059932},
    year = {2013},
    month = {09},
    doi = {10.1109/APWC.2013.6624894},
    eventtitle = {2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    faupublication = {yes},
    isbn = {9781467356893},
    keywords = {Six-Port; multiband},
    pages = {532--535},
    peerreviewed = {Yes},
    title = {A Multiband 2-Port Vector Network Analyzer based on Six-Port Junctions for Biomedical Measurement Applications between 6 GHz and 33 GHz},
    venue = {Turin, Italy},
    }
  • [DOI] S. Schröter, R. Weigel, and G. Fischer, "Employing Evolutionary Optimization for Designing Practical Beamsteering Algorithms for the Uplink of UMTS with Transmit Power Control Bits as Feedback" in International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), Almaty, Kazakhstan, 2013, pp. 93-99. [Bibtex]
    @inproceedings{schroeter2013a,
    author = {Schröter, Simon and Weigel, Robert and Fischer, Georg},
    booktitle = {International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059915},
    year = {2013},
    month = {09},
    doi = {10.1109/ICUMT.2013.6798411},
    faupublication = {yes},
    pages = {93--99},
    peerreviewed = {unknown},
    title = {Employing Evolutionary Optimization for Designing Practical Beamsteering Algorithms for the Uplink of UMTS with Transmit Power Control Bits as Feedback},
    venue = {Almaty, Kazakhstan},
    }
  • [DOI] M. Gardill, J. Schneider, F. Oesterle, G. Fischer, R. Weigel, and A. Koelpin, "Ultra-Wideband Small Antenna Subarray Module with Narrow Elevation Pattern" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, Torino, Italy, 2013. [Bibtex]
    @inproceedings{gardill2013e,
    abstract = {We propose an integrated small ultra-wideband antenna subarray module with narrow elevation pattern for future use in antenna arrays providing spatial processing capabilities such as Direction-Of-Arrival estimation in the azimuth plane, in the frequency range from 5 GHz to 8 GHz. The proposed subarray design is based on four mutually coupled Vivaldi antennas stacked on a common substrate in the E-Plane, with an element distance of delem 0;high=2. We optimize the antenna element in an infinite unit-cell stick array configuration and show that - in contrast to general believe - the truncation e ects when reducing the infinite stick-array to only four elements even reduce the total scan element reflection for broadside excitation. In addition, in contrast to most previously published E-Plane Vivaldi arrays, our design does not need a parallel-plate to microstrip balun at the feed point of each antenna element to realize an integrated planar feed network. Instead we use a novel ultra-wideband and geometrically small hybrid ring coupler to realize the array feed network directly in parallel plate technology, resulting in a low-cost, two-layer, single printed-circuit board integrated subarray module with narrow elevation pattern, operating from 5 GHz to 8 GHz.},
    author = {Gardill, Markus and Schneider, J. and Oesterle, Florian and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060010},
    year = {2013},
    month = {09},
    day = {09},
    doi = {10.1109/APWC.2013.6624934},
    eventdate = {2013-09-09/2013-09-13},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Ultra-Wideband Small Antenna Subarray Module with Narrow Elevation Pattern},
    venue = {Torino, Italy},
    }
  • [DOI] Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, "An input amplitude modulated harmonic outphasing PA" in 13th Mediterranean Microwave Symposium (MMS), Saida, Lebanon, 2013, pp. 1-4. [Bibtex]
    @inproceedings{abou-chahine2013,
    author = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    booktitle = {13th Mediterranean Microwave Symposium (MMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059921},
    year = {2013},
    month = {09},
    day = {02},
    doi = {10.1109/MMS.2013.6663082},
    eventdate = {2013-09-02/2013-09-05},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {An input amplitude modulated harmonic outphasing PA},
    venue = {Saida, Lebanon},
    }
  • [DOI] M. Hofmann, J. Nehring, R. Weigel, G. Fischer, and D. Kissinger, "A Wideband Scalar Network Analyzer for Biomedical Dehydration Measurements" in IEEE Engineering in Medicine and Biology Conference (EMBC), Osaka, Japan, 2013. [Bibtex]
    @inproceedings{hofmann2013d,
    abstract = {This paper presents a wideband microwave ap- proach towards biomedical dehydration monitoring. The intro- duced concept is verified via invasive measurements on several blood samples. A microwave measurement circuit, based of a two-port scalar vector network analyzer is presented. The circuit operates between 5GHz and 20GHz using a planar permittivity sensor. Measurements of all subcomponents are shown together with measurements of a Water-NaCl-Glycerol solution.},
    author = {Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE Engineering in Medicine and Biology Conference (EMBC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059947},
    year = {2013},
    month = {07},
    doi = {10.1109/EMBC.2013.6610434},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Wideband Scalar Network Analyzer for Biomedical Dehydration Measurements},
    venue = {Osaka, Japan},
    }
  • G. Fischer, "Does PMSE waste spectrum? - A balanced view from an engineer in Communications and Cellular" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, 2013. [Bibtex]
    @inproceedings{fischer2013,
    author = {Fischer, Georg},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060042},
    year = {2013},
    month = {07},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Does PMSE waste spectrum? - A balanced view from an engineer in Communications and Cellular},
    venue = {Ulm},
    }
  • [DOI] F. Grimminger, G. Kowalczyk, H. Unterassinger, A. Schwarzmeier, G. Fischer, R. Weigel, and D. Kissinger, "Asynchronous Subthreshold CMOS Event Detector for Wireless BAN Sensor Nodes" in IEEE BioWireleSS, Newport Beach, 2013, pp. 22-24. [Bibtex]
    @inproceedings{grimminger2013,
    abstract = {This work presents the implementation of an asynchronous event detector circuit by applying subthreshold standard cells. The presented circuit operates in an on-chip power management unit (PMU) of a wireless sensor node. Such an application demands an ultra-low power architecture for an increased overall lifetime of the sensor node. The asynchronous circuit architecture and its subthreshold logic implementation both significantly reduce the leakage power dissipation by factor three. The presented event detector is realized in a 130 nm CMOS process with regular transistors operating from a 200 mV supply voltage.},
    author = {Grimminger, Florian and Kowalczyk, G. and Unterassinger, H. and Schwarzmeier, Andre and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE BioWireleSS},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059920},
    year = {2013},
    month = {07},
    doi = {10.1109/BIOWIRELESS.2014.6827732},
    faupublication = {yes},
    keywords = {Subthreshold; Asynchronouse; Event detector; Wireless sensor node},
    pages = {22--24},
    peerreviewed = {Yes},
    title = {Asynchronous Subthreshold CMOS Event Detector for Wireless BAN Sensor Nodes},
    venue = {Newport Beach},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Essel, C. Hsieh, G. Fischer, and R. Weigel, "Measurement of Backscatter RFID-Transponders" in 14th IEEE International Workshop on Signal Processing Advances in Wireless Communications, Darmstadt, 2013, pp. 485-489. [Bibtex]
    @inproceedings{ussmueller2013a,
    author = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Hsieh, Chia-Yu and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {14th IEEE International Workshop on Signal Processing Advances in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060018},
    year = {2013},
    month = {06},
    day = {16},
    doi = {10.1109/SPAWC.2013.6612097},
    eventdate = {2013-06-16/2013-06-19},
    faupublication = {yes},
    pages = {485--489},
    peerreviewed = {unknown},
    title = {Measurement of Backscatter RFID-Transponders},
    venue = {Darmstadt},
    }
  • [DOI] M. Hofmann, S. Linz, R. Weigel, G. Fischer, and D. Kissinger, "A Multiband 2-Port VNA for Biomedical Applications based on two Six-Port-Junctions" in 2013 IEEE MTT-S International Microwave Symposium Digest (IMS), Seattle, USA, 2013. [Bibtex]
    @inproceedings{hofmann2013c,
    abstract = {This paper presents a triple band two port vector network analyzer (VNA) consisting of two six-port-junctions for biomedical concentration measurements. The microwave sensing system is designed to operate with a 10% bandwidth around 6.6 GHz, 19.7 GHz and 32.4 GHz. An embedded coplanar permit- tivity sensor will be applied for measurements of aqueous glucose solutions. The entire microwave sensing system is designed, fab- ricated and characterized with different glucose concentrations in binary solutions.},
    author = {Hofmann, Maximilian and Linz, Sarah and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    language = {English},
    booktitle = {2013 IEEE MTT-S International Microwave Symposium Digest (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059948},
    year = {2013},
    month = {06},
    doi = {10.1109/MWSYM.2013.6697658},
    eventtitle = {IEEE International Microwave Symposium},
    faupublication = {yes},
    isbn = {9781467361767},
    issn = {0149-645X},
    peerreviewed = {Yes},
    title = {A Multiband 2-Port VNA for Biomedical Applications based on two Six-Port-Junctions},
    venue = {Seattle, USA},
    }
  • [DOI] G. A. Guarin Aristizabal, M. Hofmann, R. Weigel, G. Fischer, and D. Kissinger, "Determination of sugar concentration in aqueous solutions using ultra-wideband microwave impedance spectroscopy" in IEEE MTT-S International Microwave Symposium, Seattle, WA, USA, 2013, pp. 1-3. [Bibtex]
    @inproceedings{guarin2013,
    author = {Guarin Aristizabal, Gustavo Adolfo and Hofmann, Maximilian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE MTT-S International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059954},
    year = {2013},
    month = {06},
    doi = {10.1109/MWSYM.2013.6697563},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Determination of sugar concentration in aqueous solutions using ultra-wideband microwave impedance spectroscopy},
    venue = {Seattle, WA, USA},
    }
  • [DOI] N. Franchi, G. Fischer, and R. Weigel, "Radio Hardware In-the-Loop Emulation for Testing Vehicular Communication Systems" in 5th IEEE International Symposium on Wireless Vehicular Communications - VTC Spring 2013, Dresden, Germany, 2013. [Bibtex]
    @inproceedings{franchi2013b,
    abstract = {In this work, a novel test concept Radio Hardware In-the-Loop (RadioHIL) for next generation automotive electronic control units (ECUs) with wireless interfaces is proposed. The resulting test environment is well suited for ECUs networking with wireless sensors, actuators, mobile terminals or even with other vehicles and infrastructure elements. The presented RadioHIL approach is based on Software Defined Radio (SDR) architecture. The first step for executing the RadioHIL concept is the implementation of a multi-standard waveform design for automotive relevant purposes. Therefore the model-based implementations of two compliant IEEE 802.11b and 802.11p SDR transmitters are outlined, which are of interest for vehicular wireless communication. The emulation concept is demonstrated on the Universal Software Radio Peripheral (USRP) SDR platform.},
    author = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE Vehicular Technology Society},
    booktitle = {5th IEEE International Symposium on Wireless Vehicular Communications - VTC Spring 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060012},
    year = {2013},
    month = {06},
    doi = {10.1109/WIVEC.2013.6698242},
    faupublication = {yes},
    keywords = {Software Defined Radio; Vehicular Wireless Communication; Wireless Automotive Sensor Networks; Hardware In-the-Loop; IEEE 802.11p; IEEE 802.11b; USRP; RadioHIL},
    peerreviewed = {unknown},
    title = {Radio Hardware In-the-Loop Emulation for Testing Vehicular Communication Systems},
    venue = {Dresden, Germany},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A Compact Analog Active Time delay Line using SiGe BiCMOS Technology" in IEEE International Symposium on Circuits and Systems, Beijing, China, 2013. [Bibtex]
    @inproceedings{hamouda2013a,
    abstract = {This work discusses the design of a 60ps delay element for UWB analog signals ranging from 0.05 up to 7.5GHz. The design is implemented using BJT transistors which have the advantage of being very compact in area compared to the passive architectures. The proposed architecture is flexible and can be cascaded to have delay upto 210ps with 3dB insertion loss. The circuit is designed using low cost 0.25µm 95GHz fmax SiGe-HBTBiCMOS process technology consuming a power of 121mW. The estimated consumed area of the circuit is 560µm x 870µm.},
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {IEEE International Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060002},
    year = {2013},
    month = {05},
    doi = {10.1109/ISCAS.2013.6572031},
    faupublication = {yes},
    keywords = {ultra wide band; delay; m-sequence},
    peerreviewed = {Yes},
    title = {A Compact Analog Active Time delay Line using SiGe BiCMOS Technology},
    venue = {Beijing, China},
    }
  • J. A. Chicharro, R. Weigel, G. Fischer, and T. Ußmüller, "Low Impedance Multi-Decade Integrated Amplifier for EMR Measurements in Fully Electric Vehicles" in Asia-Pacific International Symposium and Exhibition on Electromagnetic Compatibility, Melbourne, Australia, 2013. [Bibtex]
    @inproceedings{chicharro2013,
    abstract = {This paper reports on the design, simulation and measurement of a low-impedance broadband integrated amplifier in bipolar technology (Infineon’s B7HF200). Aimed to serve as a LNA for an inductive field probe operating in the frequency range 5 kHz - 6 GHz, the amplifier is designed to offer a good performance with a purely resistive 10-Ohm power source. A nominal gain of 30 dB up to 1 GHz (15 dB at 6 GHz) and and input scattering parameter s11 of -10 decibels are achieved. Power consumption is 30 mW. Limitations of and improvements for this design are discussed.},
    author = {Chicharro, José Antonio and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    booktitle = {Asia-Pacific International Symposium and Exhibition on Electromagnetic Compatibility},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059960},
    year = {2013},
    month = {05},
    day = {20},
    eventdate = {2013-05-20/2013-05-23},
    faupublication = {yes},
    keywords = {Bipolar; Integrated circuits; broadband amplifier; low-impedance LNA; EMR measurements; multi-decade},
    peerreviewed = {Yes},
    title = {Low Impedance Multi-Decade Integrated Amplifier for EMR Measurements in Fully Electric Vehicles},
    venue = {Melbourne, Australia},
    }
  • M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Design of an Ultra-Wideband Monocone Circular Antenna Array for Vehicle-Integrated Industrial Local Positioning Applications" in European Conference on Antennas and Propagation, Gothenburg, Sweden, 2013. [Bibtex]
    @inproceedings{gardill2013c,
    abstract = {We present the design of a vehicle-roof-integrated wideband circular antenna array for industrial local positioning applications. The array is designed for Direction-of-Arrival estimation in a novel ultra-wideband secondary FMCW radar system operating in the 5 GHz - 8 GHz frequency range. A novel size-reduced, mechanically robust, and application-ready monocone antenna with more than 120 % impedance bandwidth is proposed as basis element for array design, which allows for arbitrary array geometries based on a =2 grid spacing. We show measurement results and the characterization of a four-element circular array.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Conference on Antennas and Propagation},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060005},
    year = {2013},
    month = {04},
    day = {08},
    eventdate = {2013-04-08/2013-04-12},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Design of an Ultra-Wideband Monocone Circular Antenna Array for Vehicle-Integrated Industrial Local Positioning Applications},
    venue = {Gothenburg, Sweden},
    }
  • R. Weigel, G. Fischer, M. Hofmann, and J. Nehring, "Design und Synthese breitbandiger Richtkoppler fuer die Vektorielle Netzwerkanalyse" in RADCOM, Hamburg, 2013. [Bibtex]
    @inproceedings{weigel2013,
    abstract = {In this paper a complete procedure for the design, synthesis and construction of wideband directional couplers is presented. Cascading multiple quarter-wavelength line segments leads to an increase of coupling bandwidth up to 180 % but also results in discontinuities of geometry and thus in strong reflections. Furthermore, the isolation is diminished. To avoid these effects a design technique for the generation of continous, nonuniform geometries is analyzed and implemented. Two methods for the coupler synthesis are proposed and compared. One is an approximational approach and uses two sets of equations. The other uses accurate 2D field simulation of the propagating modes and is universally applicable to any kind of coupled transmission lines. The completely synthesized couplers are simulated in CST Microwave Studio and achieve very good results for coupling, isolation and return loss. A nominal -10 dB wideband coupler at a center frequency of 15 GHz and a nominal bandwidth of 164 % is built in a multilayer stackup. Good agreement between measurement and simulation results is observed.},
    author = {Weigel, Robert and Fischer, Georg and Hofmann, Maximilian and Nehring, Johannes},
    booktitle = {RADCOM},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059913},
    year = {2013},
    month = {04},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Design und Synthese breitbandiger Richtkoppler fuer die Vektorielle Netzwerkanalyse},
    venue = {Hamburg},
    }
  • [DOI] J. Rascher, A. Zohny, S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "A Comparative Overview of High Power Handling CMOS Switches and their Recent Applications in RF Front-Ends" in 14th Annual Wireless and Microwave Technology Conference (WAMICON), Orlando, FL, USA, 2013. [Bibtex]
    @inproceedings{rascher2013,
    abstract = {In this publication techniques for high power handling capability (PHC) of RF switches in bulk CMOS are investigated and compared. Together with high isolation approaches these allow reconfigurable power amplifiers (PAs) or radio front-ends for Watt level communication standards. Special care is taken to assess the applicability of the solutions for monolithic integration in scaled CMOS processes. Results are shown with PHC as high as 34dBm in a 32nm CMOS process. Recent applications for the switches in front-ends or reconfigurable PAs are analyzed. They show large DC current reduction in back-off with stage bypassing and load adaptation concepts. Up to 50% DC current reduction for low output power is reported. This greatly improves the average PA efficiency for varying envelope signals without the efforts of more advanced solutions like envelope tracking.},
    author = {Rascher, Jochen and Zohny, Amr and Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {14th Annual Wireless and Microwave Technology Conference (WAMICON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060030},
    year = {2013},
    month = {04},
    day = {07},
    doi = {10.1109/WAMICON.2013.6572754},
    eventdate = {2013-04-07/2013-04-09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Comparative Overview of High Power Handling CMOS Switches and their Recent Applications in RF Front-Ends},
    venue = {Orlando, FL, USA},
    }
  • N. Franchi, G. Fischer, and R. Weigel, "Design von adaptiven Automobil-Funksystemen mittels Rapid-SDR-Prototyping" in RADCOM 2013, Hamburg, DE, 2013. [Bibtex]
    @inproceedings{franchi2013a,
    abstract = {In den kommenden Jahren wird die Einbindung drahtloser Technologien in unsere Fahrzeuge zunehmend an Bedeutung gewinnen. Dabei wird die informationstechni- sche Vernetzung des Automobils mit anderen Fahrzeugen, mit seiner Umgebung so- wie mit mobilen Endgeräten der Passagiere als neue Schlüsselkompetenz für zukünfti- ge Fahrzeugtechnik gesehen. Bisher werden in der Automobilindustrie zur Abbildung unterschiedlicher Kommunikationsstandards meist jeweils dedizierte Chiplösungen eingesetzt, deren Funktionen kaum dynamisch angepasst werden können. In diesem Beitrag wird daher ein modulares, Software-basiertes Prototyping-Konzept vorgestellt, mit dessen Hilfe der Entwurf und die Entwicklung von flexiblen Wireless Vehicular Com- munication Systems ermöglicht werden kann. Am Beispiel der automotive-relevanten Funkstandards IEEE 802.11b und IEEE 802.11p sollen anhand einer Prototypenumset- zung sowohl die Stärken des Prototyping-Konzeptes als auch einer SDR-basierten Rea- lisierungsform von Funksystemen im Fahrzeug verdeutlicht werden.},
    author = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    booktitle = {RADCOM 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060011},
    year = {2013},
    month = {04},
    day = {24},
    eventdate = {2013-04-24/2013-04-25},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Design von adaptiven Automobil-Funksystemen mittels Rapid-SDR-Prototyping},
    venue = {Hamburg, DE},
    }
  • M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Receiving Mode CST MWS – Matlab Co-Simulations for Time and Frequency Domain UWB Small Antenna Array Characterization" in CST European User Group Meeting 2013, Stuttgart, Germany, 2013. [Bibtex]
    @inproceedings{gardill2013d,
    abstract = {Using current simulation technology the simulation setup for a small antenna array (no Unit-Cell approach) generally is as follows: the complete antenna array structure is modeled in CST MWS and a port is assigned to each antenna element. The simulation can then be performed by either exciting a single element only while all others are terminated with their port reference impedance, which would e.g. yield the active element pattern, the embedded element impedance, and the TX mode element coupling S-Parameters. Alternatively the simulation can be performed using a simultaneous excitation of all ports, with a predefined phase and amplitude distribution. This yields the pattern of the complete array for the defined excitations as well as the scan impedance for every element. However, both approaches lead to a description of the antenna array in transmit mode only, but it is a well-known fact that the TX mode characteristics differ from the RX mode characteristics significantly. In our contribution we propose a Matlab – CST Co simulation framework for simulating antenna arrays in receive mode. Therefore, we developed a Matlab function which excites the complete structure using plane waves impinging on the array from various directions of interest, records the output signals of all ports as well as the Plane wave signal (using ResultReaderDLL) and finally postprocesses the outputs to get state-of-the-art frequency and time-domain characteristics for UWB antennas and antenna arrays. In the presentation we give an introduction to the problem of UWB receiving antenna array characterization, we introduce the state-of-the-art frequency and time-domain figures of merit for UWB antennas and antenna arrays, we introduce our simulation framework, and we discuss simulation results. The simulation framework Matlab code will be available to interested users for free.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {CST European User Group Meeting 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060006},
    year = {2013},
    month = {04},
    day = {23},
    eventdate = {2013-04-23/2013-04-25},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Receiving Mode CST MWS – Matlab Co-Simulations for Time and Frequency Domain UWB Small Antenna Array Characterization},
    venue = {Stuttgart, Germany},
    }
  • M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Receiving Mode Simulations for Ultra-Wideband Characterization of Small Antenna Arrays and a Novel Look on Mutual Coupling" in Applied Computational Electromagnetics Society Conference, Monterey, CA, USA, 2013. [Bibtex]
    @inproceedings{gardill2013b,
    abstract = {Using conventional commercially available computational electromagnetics (CEM) simulation packages the simulation setup for a small antenna array generally is as follows: the complete antenna array structure is modeled in the simulation tool and the simulation is sequentially performed by exciting each single antenna element while all others are terminated with their port reference impedance. This yields a complete characterization of the array in transmit (TX) mode. However, it is a well-known fact that the TX mode characteristics differ from the receive (RX) mode characteristics significantly and the results obtained from a TX mode simulation do not necessarily capture the RX case. In this contribution we first propose an extended model for characterizing RX mode ultra-wideband (UWB) antenna-arrays, with a novel look on the RX mode coupling phenomena. Based on the theory, we propose our computational framework for accurate simulations of small receiving UWB antenna arrays. We further present simulation results for some exemplary UWB antenna arrays and discuss our novel viewpoint on RX mode array coupling.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Applied Computational Electromagnetics Society Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060008},
    year = {2013},
    month = {03},
    day = {24},
    eventdate = {2013-03-24/2013-03-28},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Receiving Mode Simulations for Ultra-Wideband Characterization of Small Antenna Arrays and a Novel Look on Mutual Coupling},
    venue = {Monterey, CA, USA},
    }
  • M. Maser, G. Fischer, R. Weigel, and T. Ußmüller, "Ein integrierter SiGe Bipolar VCO mit linearisierter Abstimmkennlinie und großem Abstimmbereich für UWB FMCW Nahbereichsortung" in Analog 2013, Aachen, Germany, 2013. [Bibtex]
    @inproceedings{maser2013,
    abstract = {Dieser Artikel beschreibt einen integrierten, spannungsgesteuerten Oszillator (engl.: voltage controlled oscillator, VCO) mit linearisierter Abstimmkennlinie für Ultrabreitbandnahbereichsortungsradaranwendungen. Der VCO ist LC-Resonator basiert. Um einen ultrabreiten, kontinuierlichen Frequenzabstimmbereich (engl.: frequency tuning range, FTR) zu erzielen, verwendet der VCO eine Negativinduktivität-Zelle (engl.: negative inductance cell, NIZelle) in Verbindung mit einem differentiellen pn-Varaktor. Durch die Kopplung der beiden Abstimmmechanismen wird eine konstantere Abstimmsensitivität (KVCO) erreicht. Der vorgestellte VCO weist einen gemessenen FTR von fmin = 3,365GHz bis fmax = 7,677GHz auf. Die Abstimmkennlinie ist in einem kontinuierlichen Frequenzbereich von 2,1GHz linearisiert, was einem relativen FTR von 34% entspricht. Die gemessene KVCO-Abweichung beträgt nur +/-10% um KVCO = 775 MHz/V.},
    author = {Maser, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {VDE Verlag GmbH},
    booktitle = {Analog 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059953},
    year = {2013},
    month = {03},
    day = {04},
    eventdate = {2013-03-04/2013-03-06},
    faupublication = {yes},
    keywords = {UWB; Local Positioning; VCO; Tuning Linearization},
    peerreviewed = {Yes},
    title = {Ein integrierter SiGe Bipolar VCO mit linearisierter Abstimmkennlinie und großem Abstimmbereich für UWB FMCW Nahbereichsortung},
    venue = {Aachen, Germany},
    }
  • S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "Modelling and Simulation of the Energy Efficiency of Heterogeneous Integrated Systems at System Level" in ITG-Fb. 239: Analog 2013, Aachen, 2013, pp. 1-6. [Bibtex]
    @inproceedings{glock2013a,
    abstract = {In recent years, the minimization of the power dissipation of integrated heterogeneous systems has become one of the most important design goals. At specification level, at which not all architectural decisions have been taken, exists the highest potential to minimize the power dissipation of the whole system. However, the high complexity of modern het-erogeneous systems complicates the estimation of the power dissipation. Especially the analysis of the power dissipa-tion beyond subsystems is challenging because it necessitates the joint simulation of analogue and digital subsystems. In this context, the question of the right abstraction level for the joint evaluation is demanding because analogue system design follows the bottom-up paradigm, whereas digital system design follows the top-down paradigm. This paper pro-poses a new methodology to model the power dissipation and energy efficiency of complex heterogeneous systems at specification level. The method is based on the hardware description language SystemC. The methodology enables ear-ly power estimation of complete heterogeneous systems. The performance of the modelling approach is shown exem-plarily on an RF-receiver of a mobile radio platform. Those platforms are both battery driven and portable. Therefore, low power consumption is of utmost importance with respect to the later success of the product.},
    author = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {ITG-Fb. 239: Analog 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059918},
    year = {2013},
    month = {03},
    day = {04},
    eventdate = {2013-03-04/2013-03-06},
    eventtitle = {13. ITG/GMM-Fachtagung Analog 2013},
    faupublication = {yes},
    isbn = {9783800734672},
    pages = {1--6},
    peerreviewed = {No},
    title = {Modelling and Simulation of the Energy Efficiency of Heterogeneous Integrated Systems at System Level},
    venue = {Aachen},
    }
  • [DOI] M. Hofmann, G. Fischer, R. Weigel, and D. Kissinger, "Microwave-Based Noninvasive Concentration Measurements for Biomedical Applications", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 5, pp. 2195-2204, 2013. [Bibtex]
    @article{hofmann2013b,
    abstract = {A Debye relaxation model for the permittivity of aqueous glucose solution is given up to 40GHz. Measurements of aqueous solutions are compared with invasive measurements on over 40 blood samples. Reflection and transmission based techniques are explained, concerning the application in biomedical concentration measurements. Wideband measurements on different sensing structures are introduced. Reflection and transmission based sensors are applied to a six-port reflectometer as well as a homodyne vector network analyzer (VNA).},
    author = {Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059945},
    year = {2013},
    month = {02},
    doi = {10.1109/TMTT.2013.2250516},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {5},
    pages = {2195--2204},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Microwave-Based Noninvasive Concentration Measurements for Biomedical Applications},
    volume = {61},
    }
  • [DOI] C. Musolff, M. Kamper, Z. Abou-Chahine, and G. Fischer, "A linear and efficient Doherty PA at 3,5GHz", IEEE Microwave Magazine, vol. 14, iss. 1, pp. 95-101, 2013. [Bibtex]
    @article{musolff2013,
    author = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059926},
    year = {2013},
    month = {02},
    doi = {10.1109/MMM.2012.2226998},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {power amplifier; Doherty; load modulation; linearity; IMD; cancellation; 3,5GHz; efficiency; backoff; twotone; harmonic balance},
    number = {1},
    pages = {95--101},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {A linear and efficient Doherty PA at 3,5GHz},
    volume = {14},
    }
  • [DOI] M. Hofmann, A. Bauch, R. Weigel, G. Fischer, and D. Kissinger, "A Microwave VNA for Biomedical In-line Concentration Measurements" in BioWireless Conference, Austin, TX, 2013. [Bibtex]
    @inproceedings{hofmann2013a,
    abstract = {This paper presents a microwave (MW) test-set designed for biomedical in-line concentration measurements. The demonstrator consists of a commercial voltage controlled oscillator (VCO) with an output power of up to +12.0 dBm, feeding an asymmetric 4 way power divider. A fraction of 0 dBm of the VCO output is driving three I-Q mixers, which realizes a homodyne vector network analyzer. Dual directional couplers were investigated concerning the application for concentration measurements. A wiggly line coupler was separately fabricated and measured as well as implemented in the demonstrator. The entire system is fabricated, calibrated and subsequently characterized with a transmission based permittivity sensor.},
    author = {Hofmann, Maximilian and Bauch, Andreas and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {BioWireless Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059946},
    year = {2013},
    month = {01},
    doi = {10.1109/BIOWIRELESS.2013.6613670},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Microwave VNA for Biomedical In-line Concentration Measurements},
    venue = {Austin, TX},
    }
  • [DOI] M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Design of a Robust and Low-Cost Monocone Antenna Element for Use in Vehicle Roof-Mounted Antenna Arrays" in IEEE Radio and Wireless Week, Austin, TX, USA, 2013, pp. 112-114. [Bibtex]
    @inproceedings{gardill2013a,
    abstract = {We present the design of a wideband monocone antenna element having more than one octave impedance as well as pattern bandwidth. It is optimized for use in vehicle roof-mounted antenna arrays for spatial processing in an ultra-wideband local positioning secondary radar system, operating in the frequency range from 5 GHz to 8 GHz. We focus on a low-cost design, offering mechanical robustness, being ruggedized towards environmental influence, and achieving small physical dimensions using a protective dielectric-encapsulated design. In addition, we suggest a solderless and robust interconnection between coaxial connector and antenna element. The antenna element allows for arbitrary planar array geometries with grid spacing at the order of the lowest frequency of operation and a simple integration in any vehicle with a metallic roof.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060007},
    year = {2013},
    month = {01},
    day = {20},
    doi = {10.1109/RWS.2013.6486658},
    eventdate = {2013-01-20/2013-01-23},
    faupublication = {yes},
    pages = {112--114},
    peerreviewed = {Yes},
    title = {Design of a Robust and Low-Cost Monocone Antenna Element for Use in Vehicle Roof-Mounted Antenna Arrays},
    venue = {Austin, TX, USA},
    }
  • [DOI] S. Glock, B. Sogl, P. Vizaretta, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "An Extension of Power Amplifier Behavioral Models for Optimizing Battery Current at System Level" in IEEE Radio and Wireless Week, Austin, TX, USA, 2013. [Bibtex]
    @inproceedings{glock2013,
    abstract = {One of the most significant figures of merit concerning a power amplifier is its effficiency. However, behavioral models of power amplifiers are mainly focused on functional aspects but not on current consumption. Therefore, simulations with respect to the efficiency of a power amplifier cannot be accomplished at system level. To close the gap of simulation capabilities, this article proposes a time efficient and accurate extension of behavioral models to predict current consumption. The current consumption model accounts for different bias conditions. For a commercial handset power amplifier, an average error of 1.9% between the fast highlevel model and measurement results is obtained.},
    author = {Glock, Stefan and Sogl, Bernhard and Vizaretta, P. and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059916},
    year = {2013},
    month = {01},
    doi = {10.1109/PAWR.2013.6490191},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {An Extension of Power Amplifier Behavioral Models for Optimizing Battery Current at System Level},
    venue = {Austin, TX, USA},
    }
  • [DOI] M. Jung, G. Fischer, R. Weigel, and T. Ußmüller, "Low Power 24 GHz ad hoc Networking System Based on TDOA for Indoor Localization", ISPRS International Journal of Geo-Information, vol. 2, iss. 4, pp. 1122-1135, 2013. [Bibtex]
    @article{jung2013,
    abstract = {This paper introduces the key elements of a novel low-power, high precision localization system based on Time-Difference-of-Arrival (TDOA) distance measurements. The combination of multiple localizable sensor nodes, leads to an ad hoc network. Besides the localization functionality this ad hoc network has the additional advantage of a communication interface. Due to this a flexible positioning of the master station for information collection and the detection of static and mobile nodes is possible. These sensor nodes work in the 24 GHz ISM (Industrial Scientific and Medical) frequency range and address several use cases and are able to improve various processes for production scheduling, logistics, quality management, medical applications and collection of geo information. The whole system design is explained briefly. Its core component is the frequency modulated continuous wave (FMCW) synthesizer suitable for high performance indoor localization. This research work focuses on power and size reduction of this crucial system component. The comparison of the first and second generation of the system shows a significant size and power reduction as well as an increased precision.},
    author = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {MDPI AG},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059929},
    year = {2013},
    doi = {10.3390/IJGI2041122},
    faupublication = {yes},
    issn = {2220-9964},
    journaltitle = {ISPRS International Journal of Geo-Information},
    keywords = {fmcw; tdoa; ad hoc networking; pll; synthesizer; tspc; frequency divider},
    number = {4},
    pages = {1122--1135},
    peerreviewed = {Yes},
    title = {Low Power 24 GHz ad hoc Networking System Based on TDOA for Indoor Localization},
    volume = {2},
    }
  • [DOI] M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Single-Element Based Ultra-Wideband Antenna Array Concepts for Wireless High-Precision 2D Local Positioning", Advances in Radio Science : Kleinheubacher Berichte, vol. 11, 2013. [Bibtex]
    @article{gardill2013,
    abstract = {We generally categorize the approaches for ultrawideband antenna array design, and consequently propose simplified concepts for antenna arrays for a high-precision, ultra-wideband FMCW radar 2D local positioning system to obtain robustness against multi path interference, perform angle of arrival analysis, as well as instantaneous heading estimation. We focus on low-cost and mechanical robust, industrial-application ready antennas. The antenna arrays are optimized for operation in the 5 GHz to 8 GHz frequency range and are designed towards supporting full omnidirectional 360 as well as partial half-plane direction of arrival estimation. Two different concepts for vehicle- as well as wall-mounted antenna array systems are proposed and discussed. We propose a wideband unidirectional bow-tie antenna array element having 97% impedance and 37% pattern bandwidth and a robust vehicle mounted omnidirectional antenna element having more than 85% impedance and pattern bandwidth.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {Copernicus},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060028},
    year = {2013},
    doi = {10.5194/ARS-11-297-2013},
    faupublication = {yes},
    issn = {1684-9965},
    journaltitle = {Advances in Radio Science : Kleinheubacher Berichte},
    peerreviewed = {Yes},
    title = {Single-Element Based Ultra-Wideband Antenna Array Concepts for Wireless High-Precision 2D Local Positioning},
    volume = {11},
    }

2012

  • [DOI] A. Zohny, S. Leuschner, M. Kastner, J. Rascher, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "Time-Efficient Adjacent Channel Power Ratio Simulation utilizing Overlap-add Signal Decomposition for UMTS Power Amplifiers" in Asia-Pacific Microwave Conference - APMC 2012, Kaohsiung, Taiwan, 2012. [Bibtex]
    @inproceedings{zohny2012b,
    abstract = {The suitability of an RF power amplifier (PA) for modern sophisticated modulation schemes demands high linearity. One of the most significant figures of merit concerning PA linearity is its adjacent channel power ratio (ACPR). The aim of this paper is to propose a time-efficient simulation procedure for ACPR which conforms with the latest 3GPP TS 25.101 specifications for its calculation. This procedure overcomes the time penalty associated with the traditional envelope-based simulation method. The approach is based on standard harmonic balance (HB) tools with MATLAB post-processing incorporating the Overlap-add (OLA) signal decomposition DSP technique for fast RRC filtering. In addition, the simulation results are compared with measurements of a commercial WCDMA PA for verification. Accuracies of better than 0.5dB and 1.1dB are achieved up to 10dB and 2dB backoff respectively.},
    author = {Zohny, Amr and Leuschner, Stephan and Kastner, M. and Rascher, Jochen and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Asia-Pacific Microwave Conference - APMC 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059753},
    year = {2012},
    month = {12},
    doi = {10.1109/APMC.2012.6421641},
    faupublication = {yes},
    keywords = {Power Amplifier; Linearity; ACPR; WCDMA; Distortion; Harmonic Balance},
    peerreviewed = {unknown},
    title = {Time-Efficient Adjacent Channel Power Ratio Simulation utilizing Overlap-add Signal Decomposition for UMTS Power Amplifiers},
    venue = {Kaohsiung, Taiwan},
    }
  • [DOI] M. Hofmann, J. Edelmann, R. Weigel, G. Fischer, and D. Kissinger, "Depth and Rate of the Save", IEEE Microwave Magazine, vol. 13, iss. 7, pp. 14-21, 2012. [Bibtex]
    @article{hofmann2012f,
    abstract = {Sudden cardiac arrest (SCA) is one of the leading causes of death worldwide. Studies have shown that roughly 90% of all patients suffering from SCAs die due to ventricular fibrillation. This phenomenon is best described as an electrical chaos in the myocardium leading to fast but at the same time very short movements of the muscle. This results in a total collapse of the blood circulation and after 3–5 min, the death of gray matter. Without any external help, this will lead to death. In the United States, for instance, 325,000 people are affected each year. It is indisputable that the quality of a cardiopulmonary resuscitation (CPR) can make the difference between life and death. In 2010, the European Resuscitation Council (ERC) as well as the American Heart Association (AHA) submitted official guidelines for resuscitation. According to the ERC and further research results, the basilife support can be significantly improved by a feedback system. The recommendation for CPR feedback systems has subsequently been adopted by the German Medical Association (GMA). A CPR feedback system gives a response to the first aider about the quality of the resuscitation (compression depth and rate).},
    author = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059746},
    year = {2012},
    month = {12},
    doi = {10.1109/MMM.2012.2216707},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {7},
    pages = {14--21},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Depth and Rate of the Save},
    volume = {13},
    }
  • [DOI] S. Schröter, R. Weigel, and G. Fischer, "Beamsteering for the Uplink of UMTS using Transmit Power Control Bits to iteratively determine the Antenna Weights" in IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012, Maui, USA, 2012. [Bibtex]
    @inproceedings{schroeter2012a,
    author = {Schröter, Simon and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059709},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417806},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Beamsteering for the Uplink of UMTS using Transmit Power Control Bits to iteratively determine the Antenna Weights},
    venue = {Maui, USA},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Essel, J. Heidrich, G. Fischer, and R. Weigel, "Roundtrip-Time-of-Flight Based Localization of Passive Multi-Standard RFID-Tags" in IEEE International Conference on Wireless Information Technologies and Systems, Wailea, HI, 2012. [Bibtex]
    @inproceedings{ussmueller2012a,
    author = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Conference on Wireless Information Technologies and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059819},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417725},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Roundtrip-Time-of-Flight Based Localization of Passive Multi-Standard RFID-Tags},
    venue = {Wailea, HI},
    }
  • [DOI] A. Zohny, J. Rascher, G. Fischer, R. Weigel, and T. Ußmüller, "A Classification and Comparative Overview of State-of-the-Art Analog Linearization Techniques for Integrated CMOS Power Amplifiers" in IEEE International Conference on Wireless Information Technology and Systems - ICWITS 2012, Hawaii, USA, 2012. [Bibtex]
    @inproceedings{zohny2012a,
    abstract = {In order to conform to the latest mobile communication standards, highly-linear power amplifiers (PA) are required. This is a challenge since high power added efficiency (PAE) is also needed for long battery life which dictates operating close to saturation where amplitude and phase nonlinearities are dominant. Thus linearization is necessary to simultaneously improve average efficiency and linearity [1]. Traditional linearization techniques such as feedback and feedforward suffer from bandwidth limitations and efficiency degradation respectively. Furthermore, digital predistortion (DPD) techniques are integrable albeit suffering from high system complexity [2]. State-of-the-art analog linearization techniques however solve many of these problems. The aim of this paper is to propose a classification of these techniques as shown in section II. In addition, section III shows a comparative overview of these techniques. Utilizing that classification and comparative study, the proper deep submicron (DSM) CMOS on-chip linearization techniques for handsets are then identified for modern communication standards.},
    author = {Zohny, Amr and Rascher, Jochen and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {IEEE International Conference on Wireless Information Technology and Systems - ICWITS 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059752},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417770},
    faupublication = {yes},
    keywords = {Power Amplifier; Linearity; PAE; CMOS; Predistortion},
    peerreviewed = {unknown},
    title = {A Classification and Comparative Overview of State-of-the-Art Analog Linearization Techniques for Integrated CMOS Power Amplifiers},
    venue = {Hawaii, USA},
    }
  • [DOI] A. Stöckle, J. Brendel, S. Rieß, R. Rose, and G. Fischer, "A low cost ultra-wide-band inverted F-Antenna for Cognitive PMSE systems" in International Conference on Wireless Information Technology and Systems, Maui, Hawaii, 2012, pp. 1-4. [Bibtex]
    @inproceedings{stoeckle2012,
    author = {Stöckle, Andreas and Brendel, Johannes and Rieß, Steffen and Rose, Richard and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {International Conference on Wireless Information Technology and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059743},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417833},
    faupublication = {yes},
    isbn = {9781467309479},
    keywords = {UWB; IFA; self-complementary; UHF; ultra-wide-band; scanning antenna; SCA},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A low cost ultra-wide-band inverted F-Antenna for Cognitive PMSE systems},
    venue = {Maui, Hawaii},
    }
  • [DOI] A. Radwan, G. Fischer, R. Weigel, and D. Kissinger, "A broadband 1.33 THz GBP 120-mW common-collector feedback amplifier in SiGe technology" in IEEE Bipolar/BiCMOS Technology and Devices Meeting, Portland, OR, 2012, pp. 72-75. [Bibtex]
    @inproceedings{gharib2012,
    author = {Radwan, Ahmed and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Bipolar/BiCMOS Technology and Devices Meeting},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059731},
    year = {2012},
    month = {10},
    doi = {10.1109/BCTM.2012.6352612},
    faupublication = {yes},
    pages = {72--75},
    peerreviewed = {unknown},
    title = {A broadband 1.33 THz GBP 120-mW common-collector feedback amplifier in SiGe technology},
    venue = {Portland, OR},
    }
  • M. Jung, G. Fischer, R. Weigel, and T. Ußmüller, "A 10 GHz Low-Power Multi-Modulus Frequency Divider using Extended True Single-Phase Clock (E-TSPC) Logic" in The European Microwave Integrated Circuits Conference, Amsterdam, 2012, pp. 508-511. [Bibtex]
    @inproceedings{jung2012a,
    author = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {The European Microwave Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059804},
    year = {2012},
    month = {10},
    faupublication = {yes},
    isbn = {9782874870262},
    pages = {508--511},
    peerreviewed = {unknown},
    title = {A 10 GHz Low-Power Multi-Modulus Frequency Divider using Extended True Single-Phase Clock (E-TSPC) Logic},
    venue = {Amsterdam},
    }
  • G. Vinci, S. Lindner, F. Barbon, M. Hofmann, G. Fischer, D. Kissinger, and A. Koelpin, "24 GHz Six-Port Medical Radar for Contactless Respiration Detection and Heartbeat Monitoring" in 9th European Radar Conference, Amsterdam, Netherlands, 2012. [Bibtex]
    @inproceedings{vinci2012f,
    abstract = {For numerous medical applications it is of primary interest to monitor the breath rate and heartbeat of a patient over time. Especially important is to observe the respiration of a patient over night to detect potential sleep disorders. Furthermore, heartbeat frequency is also a precious informationwhich can help to improve diverse diagnosis procedures. In orderto better analyze these vital parameters an innovative contactlessrespiration detection and heartbeat monitoring technique hasbeen developed. This novel method is based on the six-portinterferometric radar and is capable of detecting breath rateas well as heartbeat frequency without applying sensors orelectrodes on the patients body.},
    author = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Hofmann, Maximilian and Fischer, Georg and Kissinger, Dietmar and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {9th European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059790},
    year = {2012},
    month = {10},
    faupublication = {yes},
    keywords = {Six-Port; Bioradar; Vital Sign Monitoring; Heartbeat Detection; Respiration Detection},
    peerreviewed = {Yes},
    title = {24 GHz Six-Port Medical Radar for Contactless Respiration Detection and Heartbeat Monitoring},
    venue = {Amsterdam, Netherlands},
    }
  • [DOI] A. Ferizi, P. Baust, M. Jung, G. Fischer, R. Weigel, and A. Koelpin, "An area-efficient 130 nm CMOS baseband processing unit for 24 GHz FMCW radar positioning" in International Symposium on Signals, Systems, and Electronics (ISSSE), Potsdam, Germany, 2012, pp. 1-5. [Bibtex]
    @inproceedings{ferizi2012b,
    abstract = {This paper presents an area-efficient digital implementation of a baseband processing unit (BPU) for autonomous wireless sensor nodes with localization functionality. The presented wireless nodes should achieve a high miniaturization degree and use an onboard FMCW secondary radar for distance measurements. The challenge for designing the digital system was to reduce memory requirements towards a low cost hardware design in general, and for an ASIC design in particular. Reducing chip area implies lower energy consumption and helps saving implementation and production costs. At the same time a qualitative performance of the digital signal processing tasks while keeping the system constraints has to be assured. The introduced novel hardware implementation concept fulfill these criteria, and has been implemented and verified on a FPGA before starting the chip design. For the use case of a two-sweep-measurement-system the design has been realized as an ASIC using IBM 130nm CMOS technology.},
    author = {Ferizi, Alban and Baust, Philipp and Jung, Melanie and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {International Symposium on Signals, Systems, and Electronics (ISSSE)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059785},
    year = {2012},
    month = {10},
    doi = {10.1109/ISSSE.2012.6374292},
    faupublication = {yes},
    keywords = {Application specific integrated circuits,Baseband,Hardware,Radar,Random access memory,Wireless communication,Wireless sensor networks},
    pages = {1--5},
    peerreviewed = {unknown},
    title = {An area-efficient 130 nm CMOS baseband processing unit for 24 GHz FMCW radar positioning},
    venue = {Potsdam, Germany},
    }
  • [DOI] G. Dehm-Andone, R. Mzyk, F. Langmann, G. Fischer, R. Weigel, and A. Koelpin, "Filter Design Aspects in Analog Receiver Front-Ends for Frequency Scanning Applications" in International Symposium on Signals, Systems and Electronics 2012, Potsdam, Germany, 2012, pp. 1-4. [Bibtex]
    @inproceedings{dehm-andone2012,
    abstract = {In this paper, the design of filter components for a frequency scanning receiver RF front-end is described. The front-end is an integral component of a multichannel scanning and DF (direction finding) system. It covers a broad frequency range of VHF (very high frequency) and UHF (ultra high frequency) from 30MHz to 3GHz and comprises a scalable multichannel digital receiver as well as a hybrid synchronizable double superheterodyne analog receiver approach with direct sampling path. Focus is put on optimizing cost and benefit by balancing system and filter design efforts and choosing efficient technologies for filter implementation using COTS (commercial off-the-shelf) components. The design and implementation of a reconfigurable preselection filter bank, a coupled line resonator IF (intermediate frequency) filter, and a COTS IF filter bank are presented. The performance of these modules is demonstrated by measurement and simulation results.},
    author = {Dehm-Andone, Gunther and Mzyk, Raphael and Langmann, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {International Symposium on Signals, Systems and Electronics 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059726},
    year = {2012},
    month = {10},
    doi = {10.1109/ISSSE.2012.6374312},
    faupublication = {yes},
    keywords = {Front-End; Filter design; RF; Filter bank; IF filter; Design aspects},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Filter Design Aspects in Analog Receiver Front-Ends for Frequency Scanning Applications},
    venue = {Potsdam, Germany},
    }
  • [DOI] S. Rieß, J. Brendel, A. Stöckle, R. Rose, and G. Fischer, "Concept of an UHF Band Receiver for Spectrum Sensing Applications" in IEEE International Symposium on Signals, Systems and Electronics, Potsdam, Germany, 2012. [Bibtex]
    @inproceedings{riess2012a,
    abstract = {Spectrum sensing is a major part for the implementation of Cognitive Radio (CR) systems in order to enable dynamic access to the radio frequency spectrum. This paper describes a concept for a scanning receiver in the UHF band from 470–870 MHz. Characteristics and design considerations of an Analog and Digital Front-End are given as well as the implementation of a Baseband Processor. This is the central module of the whole receiver and the interface to a higher-level controlling unit connected through a 100 Mbit/s Ethernet link. The control interface for the receiver is similar to a spectrum analyzer and therefore easy integrable in an already existing system. Special attention in the digital part is paid to an IF subsampling approach and the clock generation circuit for the ADC. For the sake of completeness the interface to a configurable antenna and some details to the realization of the power supply are also described. This concept has been implemented in hardware in order to enable investigations for the task of spectrum sensing. Our scanning receiver is part of a complex CR system for Professional Wireless Microphone Systems (PWMS) which should be able to provide a dynamic frequency allocation of the connected radio links.},
    author = {Rieß, Steffen and Brendel, Johannes and Stöckle, Andreas and Rose, Richard and Fischer, Georg},
    booktitle = {IEEE International Symposium on Signals, Systems and Electronics},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059820},
    year = {2012},
    month = {10},
    doi = {10.1109/ISSSE.2012.6374304},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Concept of an UHF Band Receiver for Spectrum Sensing Applications},
    venue = {Potsdam, Germany},
    }
  • [DOI] A. Schwarzmeier, L. M. Reuter, J. Mena-Carrillo, W. Weber, G. Fischer, R. Weigel, and D. Kissinger, "A Low-Power Embedded Communication Platform for Medical Applications" in 46th annual conference of the German Society for Biomedical Engineering, Jena, Germany, 2012. [Bibtex]
    @inproceedings{schwarzmeier2012,
    abstract = {Introduction This paper presents a scalable, flexible and energy efficient embedded communication platform for seamless data transfer of medical sensor signals from the sensor acquisition point to a medical service centre. The presented platform can be used as an assistance system for improved medical support and care of patients and lifestyle users by providing vital parameter data to the service centre for a variety of individual assistance services. Methods The presented hardware platform is comprised of two functional blocks. A sensor platform has been implemented containing a medical device controller for collection of the data of various medical sensors connected via an analog front end or by an integrated Bluetooth transceiver module. Furthermore, a communication module including an A-GPS receiver enables GSM and UMTS data and voice connections to a central infrastructure and provides positioning data of the patient current location. The software protocol stack for the sensor data transmission is kept flexible in order to allow different communication standards. Special emphasis has been put on the energy management concept to optimize the battery life time and increase patient acceptance. Results The modular hardware and software co-design allows the connection of a wide range of different medical sensors, adjusted to the patient needs and specific use case. The use of data reduction and pre-processing techniques allows a reduction of the amount of data transferred to the infrastructure. Additionally, the centralized aggregation of sensor data enables short transmission times. This, in conjunction with an application specific energy management concept, leads to an increased battery life time. Conclusion The presented platform allows the collection of vital parameters from a variety of medical sensors for personal assistance of patients and elderly people. This concept allows new possibilities in diagnosis and treatment with the goal of an increased quality of life through the extension of independent at-home living periods.},
    author = {Schwarzmeier, Andre and Reuter, Lukas Michael and Mena-Carrillo, Juan and Weber, Werner and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {46th annual conference of the German Society for Biomedical Engineering},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059904},
    year = {2012},
    month = {09},
    doi = {10.1515/BMT-2012-4103},
    faupublication = {yes},
    keywords = {Medical; Platform; Energy; Budget},
    peerreviewed = {unknown},
    title = {A Low-Power Embedded Communication Platform for Medical Applications},
    venue = {Jena, Germany},
    }
  • I. Nasr, M. Hofmann, A. Radwan, B. Lämmle, G. Fischer, D. Kissinger, and R. Weigel, "Microwave wideband spectroscopy techniques targeting biomedical sensing applications" in Joint Symposium on Opto- and Microelectronic Devices and Circuits, Hangzhou, China, 2012, pp. 1-4. [Bibtex]
    @inproceedings{nasr2012b,
    author = {Nasr, Ismail and Hofmann, Maximilian and Radwan, Ahmed and Lämmle, Benjamin and Fischer, Georg and Kissinger, Dietmar and Weigel, Robert},
    booktitle = {Joint Symposium on Opto- and Microelectronic Devices and Circuits},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059781},
    year = {2012},
    month = {09},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Microwave wideband spectroscopy techniques targeting biomedical sensing applications},
    venue = {Hangzhou, China},
    }
  • [DOI] L. M. Reuter, R. Weigel, G. Fischer, and A. Schwarzmeier, "Energy budget in mobile health assistance systems" in BMT 2012, 46. DGBMT Jahrestagung, Jena, DE, 2012. [Bibtex]
    @inproceedings{reuter2012b,
    author = {Reuter, Lukas Michael and Weigel, Robert and Fischer, Georg and Schwarzmeier, Andre},
    booktitle = {BMT 2012, 46. DGBMT Jahrestagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059902},
    year = {2012},
    month = {09},
    doi = {10.1515/BMT-2012-4038},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Energy budget in mobile health assistance systems},
    venue = {Jena, DE},
    volume = {57},
    }
  • [DOI] M. Jung, G. Fischer, R. Weigel, and T. Ußmüller, "A CMOS divider family for high frequency wireless localization systems" in International Semiconductor Conference Dresden - Grenoble (ISCDG), Grenoble, 2012, pp. 29-32. [Bibtex]
    @inproceedings{jung2012,
    author = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {International Semiconductor Conference Dresden - Grenoble (ISCDG)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059721},
    year = {2012},
    month = {09},
    doi = {10.1109/ISCDG.2012.6359997},
    faupublication = {yes},
    isbn = {9781467317177},
    pages = {29--32},
    peerreviewed = {unknown},
    title = {A CMOS divider family for high frequency wireless localization systems},
    venue = {Grenoble},
    }
  • J. Bialek, F. Ohnhäuser, A. Wickmann, G. Fischer, and R. Weigel, "Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer" in Kleinheubacher Tagung, Kleinheubach, DE, 2012. [Bibtex]
    @inproceedings{bialek2012,
    author = {Bialek, Jan and Ohnhäuser, Frank and Wickmann, Andreas and Fischer, Georg and Weigel, Robert},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059730},
    year = {2012},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer},
    venue = {Kleinheubach, DE},
    }
  • [DOI] J. Brendel, S. Rieß, A. Stöckle, R. Rummel, and G. Fischer, "A Spectrum Sensing Network for Cognitive PMSE Systems", Frequenz, vol. 66, iss. 9-10, pp. 269-277, 2012. [Bibtex]
    @article{brendel2012b,
    abstract = {This article is about a Spectrum Sensing Network (SSN) which generates an accurate radio environment map (e.g. power over frequency, time, and location) from a given application area. It is intended to be used in combination with cognitive Program Making and Special Events (PMSE) devices (e.g. wireless microphones) to improve their operation reliability. The SSN consists of a distributed network of multiple scanning radio receivers and a central data management and storage unit. The parts of the SSN are presented in detail and the advantages and use cases of such a sensing network structure will be outlined.},
    author = {Brendel, Johannes and Rieß, Steffen and Stöckle, Andreas and Rummel, Rafael and Fischer, Georg},
    publisher = {Schiele und Sohn},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059898},
    year = {2012},
    month = {09},
    doi = {10.1515/FREQ-2012-0049},
    faupublication = {yes},
    issn = {0016-1136},
    journaltitle = {Frequenz},
    keywords = {PMSE; cognitive radio; spectrum sensing network; scanning receiver},
    number = {9-10},
    pages = {269--277},
    peerreviewed = {Yes},
    shortjournal = {FREQUENZ},
    title = {A Spectrum Sensing Network for Cognitive PMSE Systems},
    volume = {66},
    }
  • [DOI] F. Grimminger, G. Fischer, R. Weigel, and D. Kissinger, "Optimum Transistor Sizing for Low-Power Subthreshold Standard Cell Designs" in International Semiconductor Conference Dresden Grenoble, Grenoble, 2012, pp. 151-153. [Bibtex]
    @inproceedings{grimminger2012,
    abstract = {This paper presents a simple method for standard cell optimization in the subthreshold regime. Through proper dimensioning of the transistor length and width an improved symmetric propagation delay and a reduction in dynamic power consumption compared to conventional CMOS standard cell implementations is achieved. The performance of the presented cells has been verified using logic gate arrays and ring oscillators with high number of stages. The measurement results reasonably agree with simulation data.},
    author = {Grimminger, Florian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {International Semiconductor Conference Dresden Grenoble},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059713},
    year = {2012},
    month = {09},
    doi = {10.1109/ISCDG.2012.6360033},
    faupublication = {yes},
    pages = {151--153},
    peerreviewed = {unknown},
    title = {Optimum Transistor Sizing for Low-Power Subthreshold Standard Cell Designs},
    venue = {Grenoble},
    }
  • [DOI] A. Esswein, C. Carlowitz, G. Fischer, M. Vossiek, R. Weigel, and T. Ußmüller, "An Integrated Switched Injection-Locked Oscillator for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems" in Proceedings - IEEE International Conference on Ultra-Wideband, Syracuse, USA, 2012, pp. 270-273. [Bibtex]
    @inproceedings{esswein2012,
    abstract = {This paper describes an integrated switched injection-locked oscillator (SILO) circuit for use in pulsed angular modulated ultra wideband communication and radar systems. The circuit consists of two active baluns for single-ended to differential and differential to single-ended conversion, a Schmitt-trigger with modified current mirror load for current peak generation and a simple cross-coupled oscillator for signal generation. It has an externally controllable pulse repetition rate and a pulse duration of approx. 1ns. During operation it consumes 33mA at 3.3V supply voltage, while generating a 370 mVpp signal. The generated signal has a 10dB-bandwidth of over 2GHz at 7.5 GHz center frequency. Measurement results with an external baseband generator are shown. © 2012 IEEE.},
    author = {Esswein, Alexander and Carlowitz, Christian and Fischer, Georg and Vossiek, Martin and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {Proceedings - IEEE International Conference on Ultra-Wideband},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025324},
    year = {2012},
    month = {09},
    day = {17},
    doi = {10.1109/ICUWB.2012.6340458},
    eventdate = {2012-09-17/2012-09-20},
    eventtitle = {2012 IEEE International Conference on Ultra-Wideband, ICUWB 2012},
    faupublication = {yes},
    issn = {2162-6588},
    keywords = {Injection-Locking; Integrated Circuit; Pulse Generation; Pulsed Frequency Modulated Radar; Radar; VCO},
    pages = {270--273},
    title = {An Integrated Switched Injection-Locked Oscillator for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems},
    venue = {Syracuse, USA},
    }
  • [DOI] M. Hofmann, F. Trenz, R. Weigel, G. Fischer, and D. Kissinger, "A Microwave Sensing System for Aqueous Concentration Measurements based on a Microwave Reflectometer" in 2012 IEEE MTT-S International Microwave Symposium Digest (MTT), Montreal, Canada, 2012. [Bibtex]
    @inproceedings{hofmann2012c,
    abstract = {This paper presents a novel parameterized Debye relaxation model for aqueous glucose solutions up to 40 GHz. The influence on all Debye relaxation parameters is given by three equations. A compact microwave demon- strator for concentration measurements, consisting of two directional couplers, a voltage controlled oscillator (VCO), a six-port-junction, power detectors and a signal processing board is introduced. A hybrid calibration procedure for the reflectometer based approach is applied, based on a linear five standard calibration and a three standard error-box model, respectively.},
    author = {Hofmann, Maximilian and Trenz, Florian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    language = {English},
    publisher = {IEEE},
    booktitle = {2012 IEEE MTT-S International Microwave Symposium Digest (MTT)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061048},
    year = {2012},
    month = {08},
    day = {17},
    doi = {HTTP://DX.DOI.ORG/10.1109/MWSYM.2012.6259771},
    eventdate = {2012-06-17/2012-06-22},
    eventtitle = {IEEE International Microwave Symposium},
    faupublication = {yes},
    isbn = {9781467310864},
    issn = {0149-645X},
    keywords = {Diabetes;Electromagnetic reflection;Relaxation methods},
    peerreviewed = {Yes},
    title = {A Microwave Sensing System for Aqueous Concentration Measurements based on a Microwave Reflectometer},
    type = {Konferenzschrift},
    venue = {Montreal, Canada},
    }
  • T. Lautenbacher, C. Schmidt, M. Fehr, M. Kamper, R. Weigel, G. Fischer, and A. Koelpin, "Klasse-E Leistungsverstärker mit Lastmodulation" in EEEfCOM 2012, Ulm Germany, 2012. [Bibtex]
    @inproceedings{lautenbacher2012a,
    author = {Lautenbacher, Thomas and Schmidt, Christian and Fehr, Matthias and Kamper, Michael and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    booktitle = {EEEfCOM 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059907},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Klasse-E Leistungsverstärker mit Lastmodulation},
    venue = {Ulm Germany},
    }
  • G. Fischer, "Systemaspekte im Umfeld der Analog-Digital Balance von Transceivern" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, DE, 2012. [Bibtex]
    @inproceedings{fischer2012a,
    author = {Fischer, Georg},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059732},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Systemaspekte im Umfeld der Analog-Digital Balance von Transceivern},
    venue = {Ulm, DE},
    }
  • [DOI] C. Hartmann, J. Rascher, R. Weigel, G. Fischer, and T. Ußmüller, "A CMOS RF Front-End IC for Multi Antenna Diversity Applications in the S-Band" in 19th International Conference on Microwaves, Radar and Wireless Communications (MIKON), Poland, Warsaw, 2012, pp. 483-486. [Bibtex]
    @inproceedings{hartmann2012a,
    abstract = {In recent years the reception of audio broadcast signals via satellite has become popular, especially in the United States with the SDARS-system, supplying high quality broadcast services in particular to customers with mobile usage scenarios like in cars. There, the problem of reception impairments due to multipath wave propagation in urban areas or influences from dense foliage of the surrounding vegetation affects the broadcast quality. A possibility to minimize signal interruptions and to enhance the reception quality is the application of fast switchable multi antenna diversity receivers. In this paper we present the concept of an integrated RF front-end IC for such a system and describe the design of several important building blocks. The circuits are implemented in a 150nm CMOS technology from LFoundry in Landshut, Germany.},
    author = {Hartmann, Christian and Rascher, Jochen and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    booktitle = {19th International Conference on Microwaves, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059755},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233580},
    faupublication = {yes},
    pages = {483--486},
    peerreviewed = {unknown},
    title = {A CMOS RF Front-End IC for Multi Antenna Diversity Applications in the S-Band},
    venue = {Poland, Warsaw},
    }
  • [DOI] L. M. Reuter, R. Weigel, and G. Fischer, "A 16-Channel Synchronous Sampling Power Measurement System For Wireless Health Assistance Devices" in IEEE International Symposium on Medical Measurements and Apllications Proceedings (MeMeA), Budapest, HU, 2012, pp. 1-4. [Bibtex]
    @inproceedings{reuter2012a,
    abstract = {A multi-channel synchronous sampling hardware for power measurement applications is described. Future body-worn medical devices for ambient assisted living should allow for battery run-times of several days without any user interaction for charging. In order to achieve this very challenging goal, a first step is the characterization of the components within medical devices by their power consumption or charging power in order to create models of power consumption over time. Medical devices often include several sensors and wireless interfaces which are known to be the most power consuming. This paper describes a hardware that is used as a tool for the measurement of power consumption of specific peripherals on a medical ambient assisted living device during development. Thus a model can be derived that can help optimizing battery run-time by deciding when to use which interface for data transmission or sensor data acquisition. Furthermore, the tool can quantify the amount of energy gained from an energy harvester. By assessing power drained from battery and power harvested the battery status over time can be studied and charging intervals derived.},
    author = {Reuter, Lukas Michael and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE International Symposium on Medical Measurements and Apllications Proceedings (MeMeA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059903},
    year = {2012},
    month = {05},
    doi = {10.1109/MEMEA.2012.6226652},
    faupublication = {yes},
    keywords = {Ambient Assisted Living (AAL); medical devices; power measurement; wireless health assistance; energy harvesting; energy consumption characterization},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 16-Channel Synchronous Sampling Power Measurement System For Wireless Health Assistance Devices},
    venue = {Budapest, HU},
    }
  • M. Maser, M. Gardill, P. Gulden, G. Fischer, R. Weigel, and T. Ußmüller, "Local Positioning mit einem integrierten Breitband-FMCW System" in Electrical and Electronic Engineering for Communication, EEEfCOM 2012, Ulm, Germany, 2012. [Bibtex]
    @inproceedings{maser2012a,
    author = {Maser, Matthias and Gardill, Markus and Gulden, Peter and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {GEROTRON COMMUNICATION GmbH},
    booktitle = {Electrical and Electronic Engineering for Communication, EEEfCOM 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059817},
    year = {2012},
    month = {05},
    faupublication = {yes},
    keywords = {Local Positioning},
    peerreviewed = {unknown},
    title = {Local Positioning mit einem integrierten Breitband-FMCW System},
    venue = {Ulm, Germany},
    }
  • [DOI] S. Schröter, R. Weigel, G. Fischer, and A. Koelpin, "A practical beamsteering algorithm with low phase fluctuation for WCDMA/HSUPA uplink using transmit power control bits as feedback" in 19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012, Warsaw, Poland, 2012, pp. 641-646. [Bibtex]
    @inproceedings{schroeter2012,
    abstract = {So called open loop transmit diversity algorithms for the uplink of HSPA are a topic of recent studies within the 3rd Generation Partnership Project (3GPP). These algorithms use the power control commands of the fast power control mechanism as a feedback information to iteratively determine the antenna weights, thus making them compatible with existing networks and procedures. In this paper, a novel practical beamsteering algorithm is presented. Simulations show, that the transmit power at the UE terminal can be reduced by 3.28 dB compared to the reference case of only one transmit antenna, thus improving the UE's battery life. Moreover, the novel algorithm exhibits a significantly lower rate of change of the transmitted signal's absolute phase than the algorithms presented within the 3GPP studies, which means less irritation to the receiver at the Node B.},
    author = {Schröter, Simon and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    booktitle = {19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059787},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233563},
    faupublication = {yes},
    pages = {641--646},
    peerreviewed = {unknown},
    title = {A practical beamsteering algorithm with low phase fluctuation for WCDMA/HSUPA uplink using transmit power control bits as feedback},
    venue = {Warsaw, Poland},
    volume = {2},
    }
  • [DOI] M. Wiehl, S. Schwarzer, G. Fischer, R. Weigel, and A. Koelpin, "Channgel Impulse response Inside a Magnetic Resonance Imaging Device at 0.8 GHz to 27 GHz" in 19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012, Warsaw, PL, 2012, pp. 85-88. [Bibtex]
    @inproceedings{wiehl2012a,
    abstract = {Up to now, wireless transmission in a magnetic resonance imaging (MRI) device is not used extensively for sensor networks or data transmission. Wireless sensors measuring physiological parameters like pulse, ECG, blood pressure or temperature would increase patient safety during a measurement. Beside and rather more interesting is the transmission of MRI sensor data. Patients benefit from higher comfort in the magnet and faster preparation for a measurement procedure. The wireless channels in an MRI device are not well studied at present. In this paper we give a first overview of the available antenna configurations for wireless links and summarize published results. As an MRI device is located in a shielded chamber, the frequency range for a transmission can be chosen freely above the resonance frequencies of the nuclei. To get an insight in the MRI channels we studied in a first approach three exemplary channels at the GSM-900 band, the 5 GHz WLAN band and the 24 GHz ISM band in three scenarios: empty, a real patient, a NaCl-filled tube.},
    author = {Wiehl, Michael and Schwarzer, Stefan and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059757},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233474},
    faupublication = {yes},
    keywords = {UHF antennas; biomedical MRI; biomedical communication; biomedical telemetry; microwave antennas; radio links; transient response; wireless channels},
    pages = {85--88},
    peerreviewed = {unknown},
    title = {Channgel Impulse response Inside a Magnetic Resonance Imaging Device at 0.8 GHz to 27 GHz},
    venue = {Warsaw, PL},
    volume = {1},
    }
  • [DOI] C. Söll, J. Walk, G. Fischer, R. Weigel, and T. Ußmüller, "Implantable Antenna for Medical Sensor Platforms" in 19th International Conference on Microwave, Radar and Wireless Communications (MIKON), Warsaw, 2012, pp. 402-405. [Bibtex]
    @inproceedings{soell2012,
    author = {Söll, Christopher and Walk, Jasmin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {19th International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059725},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233487},
    faupublication = {yes},
    pages = {402--405},
    peerreviewed = {unknown},
    title = {Implantable Antenna for Medical Sensor Platforms},
    venue = {Warsaw},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Essel, J. Heidrich, G. Fischer, and R. Weigel, "A Multistandard HF/ UHF-RFID-Tag With Integrated Sensor Interface and Localization Capability" in 6th Annual IEEE International Conference on RFID, Orlando, FL, 2012, pp. 66-73. [Bibtex]
    @inproceedings{ussmueller2012,
    author = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    booktitle = {6th Annual IEEE International Conference on RFID},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059737},
    year = {2012},
    month = {04},
    doi = {10.1109/RFID.2012.6193058},
    faupublication = {yes},
    isbn = {9781467303293},
    pages = {66--73},
    peerreviewed = {unknown},
    title = {A Multistandard HF/ UHF-RFID-Tag With Integrated Sensor Interface and Localization Capability},
    venue = {Orlando, FL},
    }
  • L. M. Reuter, R. Agethen, F. Lurz, G. Fischer, R. Weigel, and D. Kissinger, "A mobile microcontroller platform for sensor fusion and communication" in Embedded World Conference, Nuremberg, Germany, 2012, pp. 1-4. [Bibtex]
    @inproceedings{reuter2012,
    author = {Reuter, Lukas Michael and Agethen, Roman and Lurz, Fabian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {Embedded World Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059896},
    year = {2012},
    month = {03},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {No},
    title = {A mobile microcontroller platform for sensor fusion and communication},
    venue = {Nuremberg, Germany},
    }
  • [DOI] A. Ferizi, B. Höher, M. Jung, G. Fischer, and A. Koelpin, "Design and Implementation of a Fixed-Point Radix-4 FFT Optimized for Local Positioning in Wireless Sensor Networks" in 9th International Multi-Conference on Systems, Signals & Devices, Chemnitz, Germany, 2012. [Bibtex]
    @inproceedings{ferizi2012,
    author = {Ferizi, Alban and Höher, Bernhard and Jung, Melanie and Fischer, Georg and Koelpin, Alexander},
    booktitle = {9th International Multi-Conference on Systems, Signals & Devices},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059727},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6197958},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Design and Implementation of a Fixed-Point Radix-4 FFT Optimized for Local Positioning in Wireless Sensor Networks},
    venue = {Chemnitz, Germany},
    }
  • R. Mzyk, G. Dehm-Andone, F. Langmann, G. Fischer, R. Weigel, and A. Koelpin, "Design Aspects of Scanning Receiver Systems" in IEEE German Microwave Conference, Ilmenau, Germany, 2012. [Bibtex]
    @inproceedings{mzyk2012,
    abstract = {In this paper, a cost-effective approach on receiver systems for frequency scanning and direction finding applications is presented. It consists of a hybrid analog topology, combining direct sampling and double superheterodyne architecture, as well as a scalable digital platform that offers multi channel data aquisition requiring minimum hardware ressources. The receiver front-end covers the VHF (very high frequency) and UHF (ultra high frequency) band from 30MHz to 3GHz while a 50MHz instantaneous bandwidth can be processed. Key modules like a reconfigurable filter and low noise PLL (phase-locked loop) as well as a digital platform are highlighted and the trade-off between cost effectiveness and performance is investigated.},
    author = {Mzyk, Raphael and Dehm-Andone, Gunther and Langmann, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059734},
    year = {2012},
    month = {03},
    faupublication = {yes},
    keywords = {Scanning receiver; frequency synthesis; reconfigurable filter; multi channel receiver},
    peerreviewed = {unknown},
    title = {Design Aspects of Scanning Receiver Systems},
    venue = {Ilmenau, Germany},
    }
  • [DOI] L. Zimmermann, A. Götz, G. Fischer, and R. Weigel, "GSM Mobile Phone Localization using Time Difference of Arrival and Angle of Arrival Estimation" in 9th International Multi-Conference on Systems, Signals and Devices (SSD), Chemnitz, AT, 2012, pp. 1-7. [Bibtex]
    @inproceedings{zimmermann2012a,
    abstract = {The localization methods time difference of arrival (TDOA) and angle of arrival (AOA) are investigated in their capability of high-resolution detection of GSM signals. Because GSM is of narrowband nature, a bandwidth expansion technique that significantly increases the resolution of TDOA is introduced. The algorithms maximum likelihood estimator (for TDOA), root multiple signal classification and estimation of signal parameters via rotational invariance techniques (for AOA) are proposed as a reference for each method. Simulations conducted with noisy signals and multipath propagation demonstrate the potential of TDOA for GSM localization, especially for search and rescue applications. AOA on the other hand is very sensitive to multipath, and is therefore only recommended for open space scenarios.},
    author = {Zimmermann, Lars and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    booktitle = {9th International Multi-Conference on Systems, Signals and Devices (SSD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059783},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6197970},
    faupublication = {yes},
    keywords = {cellular radio; direction-of-arrival estimation; mobile handsets; parameter estimation; radiowave propagation; signal classification; AOA; GSM mobile phone localization},
    pages = {1--7},
    peerreviewed = {unknown},
    title = {GSM Mobile Phone Localization using Time Difference of Arrival and Angle of Arrival Estimation},
    venue = {Chemnitz, AT},
    }
  • M. Hofmann, J. Edelmann, A. Bolz, R. Weigel, G. Fischer, and D. Kissinger, "Modeling and Experimental Investigation of Microwave Cardiopulmonary Resuscitation Feedback Systems" in The 7th German Microwave Conference (GeMiC), 2012, Ilmenau, DE, 2012, pp. 1-4. [Bibtex]
    @inproceedings{hofmann2012e,
    abstract = {This paper presents a novel scalable 3D thorax model for electromagnetic (EM) field simulations. Two antennas operating at 1.6 GHz are designed and matched for application in a cardiopulmonary resuscitation (CPR) feedback system. A microwave based CPR feedback system is investigated by applying the new thorax model. The fabricated antennas are evaluated in self-experiments. Magnitude and phase measurements are compared with simulation results. It is shown, that the thorax compression during CPR can be monitored with the proposed RF based approach with good agreement to the EM simulation.},
    author = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Bolz, Armin and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {The 7th German Microwave Conference (GeMiC), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059747},
    year = {2012},
    month = {03},
    faupublication = {yes},
    keywords = {HF antennas; biomechanics; biomedical measurement; cardiovascular system; compressibility; electromagnetic fields; feedback; antennas},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Modeling and Experimental Investigation of Microwave Cardiopulmonary Resuscitation Feedback Systems},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6185166},
    venue = {Ilmenau, DE},
    }
  • [DOI] F. Langmann, R. Mzyk, G. Dehm-Andone, U. Trautwein, G. Fischer, and R. Weigel, "Efficient Firmware Implementation of a Multichannel Scanning Receiver for Surveillance Applications" in IEEE International Conference on Communication and Signal Processing 2012, Chemnitz, 2012. [Bibtex]
    @inproceedings{hausknecht2012a,
    author = {Langmann, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Trautwein, Uwe and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Conference on Communication and Signal Processing 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059739},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6197940},
    faupublication = {yes},
    keywords = {Scanning; Surveillance; Receiver; Firmware; Digital; Multichannel},
    peerreviewed = {unknown},
    title = {Efficient Firmware Implementation of a Multichannel Scanning Receiver for Surveillance Applications},
    venue = {Chemnitz},
    }
  • F. Langmann, R. Mzyk, G. Dehm-Andone, G. Fischer, and R. Weigel, "A Digital Platform for a Multichannel Digital Wideband Scanning Receiver" in 7th Karlsruhe Workshop on Software Radios, Karlsruhe, 2012. [Bibtex]
    @inproceedings{hausknecht2012,
    author = {Langmann, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Fischer, Georg and Weigel, Robert},
    booktitle = {7th Karlsruhe Workshop on Software Radios},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059715},
    year = {2012},
    month = {03},
    faupublication = {yes},
    keywords = {Digital; Platform; Multichannel; Scanning; Receiver; Architecture},
    peerreviewed = {unknown},
    title = {A Digital Platform for a Multichannel Digital Wideband Scanning Receiver},
    venue = {Karlsruhe},
    }
  • J. Brendel, S. Rieß, A. Stöckle, R. Rummel, R. Rose, and G. Fischer, "A Spectrum Sensing Network for Cognitive PMSE Systems" in 7th Workshop on Software Radios (WSR), Karlsruhe, DE, 2012, pp. 137-142. [Bibtex]
    @inproceedings{brendel2012,
    abstract = {This paper is about a Spectrum Sensing Network (SSN) which generates an accurate radio environment map (e.g. power over frequency, time, and location) from a given application area. It is intended to be used in combination with cognitive Program Making and Special Events (PMSE) devices (e.g. wireless microphones). It consists of a distributed network of multiple scanning radio receivers and a central data management and storage unit. The parts of the SSN are presented in detail and the advantages and the use cases of such a sensing network structure are outlined.},
    author = {Brendel, Johannes and Rieß, Steffen and Stöckle, Andreas and Rummel, Rafael and Rose, Richard and Fischer, Georg},
    publisher = {Karlsruhe Institute of Technology - Communication Engineering Lab},
    booktitle = {7th Workshop on Software Radios (WSR)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059900},
    year = {2012},
    month = {03},
    faupublication = {yes},
    pages = {137--142},
    peerreviewed = {unknown},
    title = {A Spectrum Sensing Network for Cognitive PMSE Systems},
    venue = {Karlsruhe, DE},
    }
  • [DOI] A. Koelpin, G. Vinci, F. Barbon, S. Lindner, G. Fischer, and R. Weigel, "The Six-Port Technology: A Low-Cost Concept for Precise Position Measurements" in 9th International Multi-Conference on Systems, Signals and Devices, Chemnitz, 2012, pp. 1-5. [Bibtex]
    @inproceedings{koelpin2012a,
    abstract = {Local positioning is a demanding task for industrial environments. With the help of six-port technology, a precise and easy to use concept for angle of arrival (AoA) and distance measurements will be presented in this publication. AoA resolution below 0.005° and resolving distances of 1µm for a 24 GHz six-port architecture will be shown by measurement results. Furthermore, impairments compensation issues and limitations of the technology will be discussed.},
    author = {Koelpin, Alexander and Vinci, Gabor and Barbon, Francesco and Lindner, Stefan and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {9th International Multi-Conference on Systems, Signals and Devices},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059811},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6198100},
    faupublication = {yes},
    isbn = {9781467315906},
    keywords = {Antenna measurements; Microwave circuits; Microwave integrated circuits; Microwave measurements; Receivers; direction-of-arrival estimation; Six-Port},
    number = {12726797},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {The Six-Port Technology: A Low-Cost Concept for Precise Position Measurements},
    venue = {Chemnitz},
    }
  • [DOI] R. Mzyk, G. Dehm-Andone, F. Langmann, G. Fischer, R. Weigel, and A. Koelpin, "Analysis of Key Modules in an Analog Front-End for Scanning Receiver Systems" in IEEE International Conference on Microwaves, Radar & Wireless Communications, Warsaw, Poland, 2012, pp. 45-49. [Bibtex]
    @inproceedings{mzyk2012a,
    abstract = {In this paper, a cost-effective approach on receiver systems for frequency scanning and direction finding applications is presented. A hybrid approach on analog front-end topology is introduced, that combines direct sampling and double superheterodyne architecture. Key modules like a reconfigurable filter, reference clock distribution units, and low noise PLL (phaselocked loop) are highlighted and the trade-off between cost effectiveness and performance is investigated. The performance of those modules is presented by measurement results.},
    author = {Mzyk, Raphael and Dehm-Andone, Gunther and Langmann, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE International Conference on Microwaves, Radar & Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059818},
    year = {2012},
    month = {03},
    doi = {10.1109/MIKON.2012.6233481},
    faupublication = {yes},
    keywords = {Scanning receiver; surveillance; clock distribution; frequency synthesis; reconfigurable filter},
    pages = {45--49},
    peerreviewed = {unknown},
    title = {Analysis of Key Modules in an Analog Front-End for Scanning Receiver Systems},
    venue = {Warsaw, Poland},
    }
  • G. Fischer, "Frequency Agile RF Systems", 2012. [Bibtex]
    @other{fischer2012,
    author = {Fischer, Georg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059909},
    year = {2012},
    month = {02},
    faupublication = {no},
    keywords = {Frequency Agile Radio; SDR; CR},
    peerreviewed = {No},
    title = {Frequency Agile RF Systems},
    type = {Zeitungsartikel},
    }
  • [DOI] J. Rascher, S. Pinarello, J. Müller, G. Fischer, and R. Weigel, "Highly linear robust RF switch with low insertion loss and high power handling capability in a 65nm CMOS technology" in 2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF), Santa Clara, USA, 2012, pp. 21-24. [Bibtex]
    @inproceedings{rascher2012,
    abstract = {This work reports on the considerations for building RF switches in deeply scaled CMOS. As demonstrator single pole single throw (SPST) switches in a standard 65 nm technology are designed and measured. Goal of this design is lowest insertion loss while achieving high power handling capability, linearity, and robustness. For the novel design of switch variant Dev 1 0.8dB of insertion loss, 30dBm of power handling and an input third order intermodulation intercept point (iIP3) of 48.8 dBm has been achieved at 1.8 GHz. High robustness is achieved by stacking 4 transistors. Isolation at 1.8 GHz is better than 22dB. For high power handling capability in off state a method is implemented to rise the DC voltage level at inner nodes of the switch. Thus the threshold voltage lowering in deeply scaled CMOS can be counteracted. The small and large signal behaviour of the switch is compared to conventional designs and benefits are proven.},
    author = {Rascher, Jochen and Pinarello, Sandro and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    booktitle = {2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059788},
    year = {2012},
    month = {01},
    doi = {10.1109/SIRF.2012.6160157},
    faupublication = {yes},
    isbn = {9781457713170},
    pages = {21--24},
    peerreviewed = {unknown},
    title = {Highly linear robust RF switch with low insertion loss and high power handling capability in a 65nm CMOS technology},
    venue = {Santa Clara, USA},
    }
  • J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Telemedicine at the example of sensor implants" in IEEE Radio and Wireless Symposium (RWS), Santa Clara, CA, USA, 2012. [Bibtex]
    @inproceedings{walk2012,
    abstract = {In recent years, much research has been devoted to the improvement of telemedicine. As an introduction of the workshop the first talk will review the basics of telemedicine and medical sensor applications. Central challenges and several system concepts will be introduced and their pros and cons will be discussed. Favorable health care needs completely imperceptible and maintenance free sensor devices. Especially long term monitoring sensors have to meet this requirement. A promising solution is an implantable sensor system. The permittivity of body tissue and the desired distance to a remote station confronts the technology with several challenges. In addition a local data platform will be presented, which has to realize the interaction between sensors and a cellular network.},
    author = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059711},
    year = {2012},
    month = {01},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Telemedicine at the example of sensor implants},
    venue = {Santa Clara, CA, USA},
    }
  • [DOI] M. Dudek, I. Nasr, D. Kissinger, R. Weigel, and G. Fischer, "The Impact of Antenna Characteristics on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications" in IEEE Radio Wireless Symposium (RWS), Santa Clara (CA), USA, 2012, pp. 107-110. [Bibtex]
    @inproceedings{dudek2012,
    abstract = {In this scientific paper a versatile system simulation environment is introduced that enables investigations on millimeter-wave FMCW-radar sensors. With respect to the latest developments in automotive radar the simulator combines an RF-frontend simulation engine and a 3D ray-tracing tool to take the effects of the radar channel into account. Furthermore different antenna characteristics can be generated by the phased-array radar topology implemented to examine not only the behavior of the RF-frontend but the impact of the concrete traffic situation on the whole sensor system. Therefore development engineers are actively assisted with their task to design new accurate and reliable systems, thus enabling the transition from current pure comfort systems to future systems including an increased number of safety functions. To demon-strate the usability of this advanced simulation approach for the development of future radar sensors a typical traffic scenario is calculated showing not only the impact of the antennas’ beamwidth and side-lobes on target signal detection, but also the performance of the simulation environment built-up.},
    author = {Dudek, Manuel and Nasr, Ismail and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE Radio Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059908},
    year = {2012},
    month = {01},
    doi = {10.1109/RWS.2012.6175357},
    faupublication = {yes},
    pages = {107--110},
    peerreviewed = {unknown},
    title = {The Impact of Antenna Characteristics on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications},
    venue = {Santa Clara (CA), USA},
    }
  • [DOI] Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, "Efficiency Analysis of the Asymmetric 2-Level Outphasing PA with Rayleigh Enveloped Signals" in IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), Santa Clara, CA, 2012, pp. 85-88. [Bibtex]
    @inproceedings{abou-chahine2012,
    abstract = {This paper focuses on the analysis of the generalized asymmetric outphasing amplification, yielding an expression for its combining efficiency. It also briefly reviews the outphasing power amplifier (PA) concept and interprets it from a functional perspective. The paper concludes with an analytical efficiency optimization for the 2-level asymmetric case with the transmitted signal having a Rayleigh amplitude distribution.},
    author = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059714},
    year = {2012},
    month = {01},
    doi = {10.1109/PAWR.2012.6174930},
    faupublication = {yes},
    keywords = {optimisation; power amplifiers; Rayleigh amplitude distribution; Rayleigh enveloped signals; asymmetric 2-level outphasing PA; efficiency analysis; efficiency optimization; generalized asymmetric outphasing amplification; outphasing power amplifier; Bandwidth; Microwave circuits; Microwave communication; Modulation; Optimization; Peak to average power ratio; Outphasing architecture; RF PA; Rayleigh PDF; Wilkinson power combining; efficiency maximization},
    pages = {85--88},
    peerreviewed = {unknown},
    title = {Efficiency Analysis of the Asymmetric 2-Level Outphasing PA with Rayleigh Enveloped Signals},
    venue = {Santa Clara, CA},
    }
  • [DOI] I. Nasr, B. Lämmle, H. Knapp, G. Fischer, R. Weigel, and D. Kissinger, "A wide tuning range high output power 56-74 GHz VCO with on-chip transformer load in SiGe technology" in IEEE Topical Meeting Silicon Monolithic Integrated Circuits in RF Systems Digest, Santa Clara, CA, USA, 2012, pp. 49-52. [Bibtex]
    @inproceedings{nasr2012,
    abstract = {This paper presents a wide tuning range modified Colpitts VCO with high output power. The circuit was fabricated using a lowcost SiGe technology with an ft/fmax of 170/250 GHz. The VCO can be tuned between 56.4 and 73.8 GHz having a tuning range of approx. 27%. The maximum measured output power is +9.4 dBm, and the output power remains above +7.0 dBm over the entire tuning range. The VCO has a minimum phase noise of -95 dBc/Hz, which stays below -88 dBc/Hz over the entire tuning range. On-chip frequency dividers were used to enable easier measurement. A single transformer was designed and used simultaneously for output matching of the VCO and as an output balun. The overall chip draws 112 mA from a 3.3 V supply, where the VCO draws 45 mA of the total current.},
    author = {Nasr, Ismail and Lämmle, Benjamin and Knapp, Herbert and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE Topical Meeting Silicon Monolithic Integrated Circuits in RF Systems Digest},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059823},
    year = {2012},
    month = {01},
    doi = {10.1109/SIRF.2012.6160130},
    faupublication = {yes},
    isbn = {9781457713170},
    keywords = {VCO; Transformer; Frequency Dividers; Colpitts; FMCW},
    pages = {49--52},
    peerreviewed = {unknown},
    title = {A wide tuning range high output power 56-74 GHz VCO with on-chip transformer load in SiGe technology},
    venue = {Santa Clara, CA, USA},
    }
  • [DOI] T. Lautenbacher, R. Mzyk, R. Weigel, G. Fischer, and A. Koelpin, "High-Q Split Ring Resonators for Tuning and Balun Applications" in Microwave and Radar Week MRW 2012 Warschau, Warschau, Polen, 2012. [Bibtex]
    @inproceedings{lautenbacher2012,
    abstract = {High-Q planar filters based on split ring resonators (SRRs) in suspended stripline technology (SSL) are investigated concerning different purposes. Initially, the SRR is analyzed regarding possibilities for optimization of quality factor Q. Beside this, the tuning potential of SRRs is explained. Therefore, an RF MEMS varactor is introduced together with an examination of its potential coupling methods to the SRR. Furthermore, the incorporation of the functionalities filter and balanced-to-unbalanced transformer (Balun) using one SRR is shown. The introduced concepts are proven by simulations and practical demonstrations.},
    author = {Lautenbacher, Thomas and Mzyk, Raphael and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    booktitle = {Microwave and Radar Week MRW 2012 Warschau},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059740},
    year = {2012},
    doi = {10.1109/MIKON.2012.6233484},
    faupublication = {yes},
    keywords = {Split Ring Resonator; High-Q; Suspended Stripline; tuning; RF MEMS; varactor; balun; reconstruction filter},
    peerreviewed = {unknown},
    title = {High-Q Split Ring Resonators for Tuning and Balun Applications},
    venue = {Warschau, Polen},
    }
  • [DOI] M. Hamouda, J. Sachs, T. Ußmüller, G. Fischer, and R. Weigel, "High Precision Wireless Synchronization Receiver for M-Sequence UWB Radio Systems" in Internation Conference on Ultra-wide Band 2012, Syracuse, NewYork, USA, 2012. [Bibtex]
    @inproceedings{hamouda2012,
    abstract = {This work deals with M-sequence UWB Radio architectures for high-precision indoor localization and low data rate radio transmission. So far, UWB M-sequence devices were only used in Radar mode which applies wired synchronization between transmitter and receiver. Radio systems have different architecture since receiver and transmitter are spatially separated from each other. This paper focuses on the phase and frequency synchronization between the clock of the transmitter and receiver. The proposed architecture deals with 10 gigachips per second achieving a high frequency bandwidth ranging from DC upto 5GHz or consequently from 5GHz to 15GHz depending on the device structure. It is very costly and power demanding to process such signals in the digital domain to perform the synchronization. Thus, a low power and low cost technique is introduced using analog blocks for the synchronization achieving a maximum error of 5ps.},
    author = {Hamouda, Mohamed and Sachs, Jürgen and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {Internation Conference on Ultra-wide Band 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059803},
    year = {2012},
    doi = {10.1109/ICUWB.2012.6340420},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {High Precision Wireless Synchronization Receiver for M-Sequence UWB Radio Systems},
    venue = {Syracuse, NewYork, USA},
    }
  • [DOI] A. Götz, R. Rose, S. Zorn, G. Fischer, and R. Weigel, "Performance of Coherent Time Delay Estimation Techniques for Frequency Hopping GSM Signals" in Topical Conference on Wireless Sensors and Sensor Networks (RWW / WiSNet), Santa Clara, California, USA, 2012, pp. 25-28. [Bibtex]
    @inproceedings{goetz2012,
    abstract = {In this paper, the performance of coherent time delay estimation techniques for frequency hopping GSM signals is investigated. It is demonstrated that the techniques enable the usage of a substantially higher bandwidth for time delay estimation and localization purposes compared to state-of-the-art techniques. Since resolution and noise performance directly depend on the applied bandwidth of the signals, major improvements can be realized. For E-GSM 900 systems, an overall bandwidth of up to 35 MHz may be used which enables time delay estimation and localization in the scale of a few meters. The coherent time delay estimation techniques are therefore ideally suited for search and rescue applications.},
    author = {Götz, Alexander and Rose, Richard and Zorn, Stefan and Fischer, Georg and Weigel, Robert},
    booktitle = {Topical Conference on Wireless Sensors and Sensor Networks (RWW / WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059777},
    year = {2012},
    doi = {10.1109/WISNET.2012.6172142},
    faupublication = {yes},
    keywords = {GSM; TDOA; Localization; Frequency Hopping},
    pages = {25--28},
    peerreviewed = {unknown},
    title = {Performance of Coherent Time Delay Estimation Techniques for Frequency Hopping GSM Signals},
    venue = {Santa Clara, California, USA},
    }
  • M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A Low Power SiGe HBT LNA For UWB Applications" in German Microwave Conference, Ilmenau, Germany, 2012. [Bibtex]
    @inproceedings{hamouda2012a,
    abstract = {A low noise amplifier (LNA) is implemented in this work for ultra wide band (UWB) localization and sensing systems within a wide frequency range starting from 400MHz and up to 10GHz. The topology used is a resistive shunt feedback and a peaking inductance in series with the output transistor to achieve the desired bandwidth and have better noise performance. The LNA is fabricated in low cost 0.25μm 92GHz fmax SiGe-HBT BiCMOS process technology. The area of the manufactured chip is 0.73mm2. The achieved gain is 12dB with a NF less than 3.7dB over the entire frequency range while the consumed power is only 14.5mW.},
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059741},
    year = {2012},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Low Power SiGe HBT LNA For UWB Applications},
    venue = {Ilmenau, Germany},
    }
  • M. Hofmann, M. Bloss, R. Weigel, G. Fischer, and D. Kissinger, "Non-Invasive Glucose Monitoring Using Open Electromagnetic Waveguides" in EuMA European Microwave Conference, Amsterdam, 2012. [Bibtex]
    @inproceedings{hofmann2012b,
    abstract = {This paper presents a novel approach towards noninvasive glucose measurement. The introduced concept is based on an electromagnetic (EM) wave transmission along blood vessels. Theoretical investigation of a TEM wave propagation through a aqueous glucose solution is shown. The concept was evaluated by a simplified demonstrator which consists of a dielectric covered TEM-Waveguide. A 3D field simulation of the structure has been performed with a glucose dependent Debye relaxation model. The EM waveguide was fabricated and measured with various glucose concentrations. A phase difference of 12 deg for a 500mg/dl variation in glucose concentration was measured at 20GHz.},
    author = {Hofmann, Maximilian and Bloss, M. and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {EuMA European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059750},
    year = {2012},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Non-Invasive Glucose Monitoring Using Open Electromagnetic Waveguides},
    venue = {Amsterdam},
    }
  • [DOI] M. Maser, G. Fischer, R. Weigel, and T. Ußmüller, "An Integrated SiGe Bipolar VCO with Linearized Tuning Behavior and Ultra-Wide Tuning Range for UWB FMCW Local Positioning Systems" in 2012 International Semiconductor Conference Dresden - Grenoble, Grenoble, France, 2012. [Bibtex]
    @inproceedings{maser2012,
    abstract = {This paper describes an integrated voltage controlled oscillator (VCO) with linearized tuning behavior for ultra-wideband local positioning radar applications. The VCO is LC-resonator based and uses a tunable negative inductance cell (NI-cell) in conjunction with a differential junction varactor to achieve an ultra-wide, continuous frequency tuning range (FTR). A tuning linearization circuit is used to couple both tuning mechanisms to attain a more constant tuning sensitivity (K_VCO). The presented VCO offers a measured FTR from f_min = 3.365 GHz to f_max = 7.677 GHz. The tuning curve is linearized in a frequency range of 2.1 GHz with a measured K_VCO-deviation of only +/-10% around K_VCO = 775 MHz/V, which corresponds to a relative FTR of 34%.},
    author = {Maser, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {2012 International Semiconductor Conference Dresden - Grenoble},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059751},
    year = {2012},
    doi = {10.1109/ISCDG.2012.6359998},
    faupublication = {yes},
    keywords = {FMCW-radar; negative inductance; SiGe Bipolar; tuning linearization; ultra-wide continuous tuning range; voltage controlled oscillator},
    peerreviewed = {unknown},
    title = {An Integrated SiGe Bipolar VCO with Linearized Tuning Behavior and Ultra-Wide Tuning Range for UWB FMCW Local Positioning Systems},
    venue = {Grenoble, France},
    }
  • J. Nehring, M. Hofmann, C. Münker, R. Weigel, G. Fischer, and D. Kissinger, "A Universal Method for the Design and Synthesis of Wideband Directional Couplers using Non-Uniform Coupled Transmission Lines" in IEEE European Microwave Conference, Amsterdam, The Netherlands, 2012. [Bibtex]
    @inproceedings{nehring2012,
    abstract = {In this paper a complete procedure for the design, synthesis and construction of wideband directional couplers is presented. Cascading multiple quarter-wavelength line segments leads to an increase of coupling bandwidth up to 180% but also results in discontinuities of geometry and thus in strong reflec- tions. Furthermore, the isolation is diminished. To avoid these effects a design technique for the generation of continous, non-uniform geometries is analyzed and implemented. Two methods for the coupler synthesis are proposed and compared. One is an approximational approach and uses two sets of equations. The other uses accurate 2D field simulation of the propagating modes and is universally applicable to any kind of coupled transmission lines. The completely synthesized couplers are simulated in CST Microwave Studio and achieve very good results for coupling, isolation and return loss. A nominal -10dB wideband coupler at a center frequency of 15GHz and a nominal bandwidth of 164% is built in a multilayer stackup. Good agreement between measurement and simulation results is observed.},
    author = {Nehring, Johannes and Hofmann, Maximilian and Münker, Christian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059779},
    year = {2012},
    faupublication = {yes},
    keywords = {wideband directional coupler; wideband; coupler; non-uniform},
    peerreviewed = {unknown},
    title = {A Universal Method for the Design and Synthesis of Wideband Directional Couplers using Non-Uniform Coupled Transmission Lines},
    venue = {Amsterdam, The Netherlands},
    }

2011

  • J. Rascher, S. Pinarello, J. Müller, G. Fischer, and R. Weigel, "Methods for Low Insertion Loss RF Switches with Increased Power Handling Capability in 65nm CMOS" in Asia-Pacific Microwave Conference 2011 (APMC 2011), Melbourne, Australia, 2011, pp. 1897-1900. [Bibtex]
    @inproceedings{rascher2011a,
    abstract = {This work reports on methods and dependencies for the design of low insertion loss single pole single throw (SPST) switches in 65nm CMOS with triple well transistors. Two different switch types are investigated and implemented. The series switch has less than 1dB insertion loss at 1.8GHz and a 1dB input compression point (P1dB) of 28.8dBm. The shunt switch has less than 0.4dB insertion loss at 1.8GHz and a P1dB of 29.1dBm. Isolation of the series and shunt switches at 1.8GHz is better than 21dB and 20dB, respectively. By applying a resistive body floating technique low insertion loss and increased power handling capability are achieved. At the shunt switch negative gate bias is adopted for improved P1dB. At the series switch a method is implemented to boost the DC voltage level at source/ drain nodes of transistors for improved power handling capability in off state without additional circuitry or any DC power consumption. The combination of these methods andan additional DC voltage in on state increases power handling capability in both states of the switch.},
    author = {Rascher, Jochen and Pinarello, Sandro and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    booktitle = {Asia-Pacific Microwave Conference 2011 (APMC 2011)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059264},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1897--1900},
    peerreviewed = {unknown},
    title = {Methods for Low Insertion Loss RF Switches with Increased Power Handling Capability in 65nm CMOS},
    venue = {Melbourne, Australia},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "A Versatile System Simulation Environment for Millimeter-Wave Phased-Array FMCW-Radar Sensors for Automotive Applications" in Asia-Pacific Microwave Conference (APMC), Melbourne, Australia, 2011, pp. 1478-1481. [Bibtex]
    @inproceedings{dudek2011f,
    abstract = {In this contribution a versatile system simulation environment for radar sensors being developed to operate in the automotive area is introduced. It combines a frontend simulation engine that is coupled in a co-simulation with a 3D ray-tracing tool to take the effects of the automotive radar channel into account, thus providing accurate and reliable results concerning the behavior of the implemented circuits in certain traffic situations. With respect to the latest developments in automotive radar, i.e. the transition from former comfort systems to current systems including an increased number of safety functions, the system simulation environment has been extended to support investigations on the phased-array radar principle. Applying this technique in the automotive area promises advantages in target detection in the vehicles vicinity by the means of increased hardware requirements, resulting in radar systems that are by far more difficult to design due to the number of side-effects that have to be additionally considered during the development process. To demonstrate the capability of this advanced simulation approach a typical traffic scenario is calculated showing not only the advantages of phased-array radar for the automotive field but also the performance of the simulation environment built up.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {Asia-Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059246},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1478--1481},
    peerreviewed = {unknown},
    title = {A Versatile System Simulation Environment for Millimeter-Wave Phased-Array FMCW-Radar Sensors for Automotive Applications},
    venue = {Melbourne, Australia},
    }
  • P. Jüschke, J. Brendel, G. Fischer, and A. Pascht, "Feed-forward neural networks for analog impairment mitigation in high power RF transceivers" in Asia-Pacific Microwave Conference (APMC), Melbourne, Australia, 2011, pp. 1650-1653. [Bibtex]
    @inproceedings{jueschke2011,
    abstract = {Constantly rising capacity and increasing complexity of mobile communication systems as well as the general demand to reduce the power consumption to get the systems greener, are a big challenge especially for radio frontends. Complex modulated signals of mobile communication standards like LTE have high demands on radio frontends regarding signal requirements. the numerous variety of different standards in different frequency bands have further demands on radio transceivers and its architecture. Flexible radios, suitable for different standards, signals and frequencies with highest efficiency and dynamic are required. This paper shows possibilities to enhance the flexibility of RF transceivers and how to enable future standards and handle high requirements while relaxing configuration using neural networks for signal processing in RF transceivers.},
    author = {Jüschke, Patrick and Brendel, Johannes and Fischer, Georg and Pascht, Andreas},
    publisher = {IEEE},
    booktitle = {Asia-Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059249},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1650--1653},
    peerreviewed = {unknown},
    title = {Feed-forward neural networks for analog impairment mitigation in high power RF transceivers},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6174084},
    venue = {Melbourne, Australia},
    }
  • S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector" in A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector, Melbourne, Australia, 2011, pp. 1-4. [Bibtex]
    @inproceedings{glock2011a,
    abstract = {This paper introduces a power-aware behavioral modeling approach for analog components. A Verilog-A behavioral model, which considers the component’s current consumption, is created using circuit information obtained from transistorlevel simulation. Therefore, the model features high accuracy with the benefit of low computational effort. The concept can be applied to any analog component and enables the simulation of complex analog systems. The approach is practically applied to the design of a phase-frequency detector, which determines important characteristics of a PLL.},
    author = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059238},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector},
    venue = {Melbourne, Australia},
    }
  • M. Jung, J. Fuhrmann, A. Ferizi, G. Fischer, R. Weigel, and T. Ußmüller, "Design of a 12 ghz low-power extended true single phase clock (e-tspc) prescaler in 0.13 um cmos technology" in Asia-Pacific Microwave Conference, Melbourne, VIC, 2011, pp. 1238-1241. [Bibtex]
    @inproceedings{jung2011d,
    author = {Jung, Melanie and Fuhrmann, Jörg and Ferizi, Alban and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {Asia-Pacific Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059310},
    year = {2011},
    month = {12},
    faupublication = {yes},
    isbn = {9781457720345},
    pages = {1238--1241},
    peerreviewed = {unknown},
    title = {Design of a 12 ghz low-power extended true single phase clock (e-tspc) prescaler in 0.13 um cmos technology},
    venue = {Melbourne, VIC},
    }
  • M. Jung, K. Schmid, G. Fischer, R. Weigel, and T. Ußmüller, "Vergleich verschiedener schaltungskonzepte für stromgebende ladungspumpen in phasenregelschleifen" in 12. GMM/ITGFachtagung Analog, Erlangen, 2011. [Bibtex]
    @inproceedings{jung2011c,
    author = {Jung, Melanie and Schmid, Konstantin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {12. GMM/ITGFachtagung Analog},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059308},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Vergleich verschiedener schaltungskonzepte für stromgebende ladungspumpen in phasenregelschleifen},
    venue = {Erlangen},
    }
  • A. Esswein, G. Dehm-Andone, A. Aleksieieva, C. Carlowitz, G. Fischer, M. Vossiek, R. Weigel, and T. Ussmueller, "Spannungsgesteuerter Colpitts-Oszillator mit weitem Abstimmbereich in Silizium-Germanium-Technologie und Ausgangsschalter zur Generierung gepulster frequenzmodulierter Ultrabreitband-Signale" in 12. GMM/ITG-Fachtagung Analog 2011, 2011. [Bibtex]
    @inproceedings{esswein2011,
    author = {Esswein, Alexander and Dehm-Andone, Gunther and Aleksieieva, Anna and Carlowitz, Christian and Fischer, Georg and Vossiek, Martin and Weigel, Robert and Ussmueller, Thomas},
    booktitle = {12. GMM/ITG-Fachtagung Analog 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1054431},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Spannungsgesteuerter Colpitts-Oszillator mit weitem Abstimmbereich in Silizium-Germanium-Technologie und Ausgangsschalter zur Generierung gepulster frequenzmodulierter Ultrabreitband-Signale},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "An Advanced Millimeter-Wave FMCW-Radar System Simulation Environment for the Automotive Sector" in 12. GMM/ITG-Fachtagung ANALOG, Erlangen, Germany, 2011, pp. 104-109. [Bibtex]
    @inproceedings{dudek2011e,
    abstract = {In this paper a millimeter-wave radar system simulation environment for frequency-modulated continuous-wave radar using a 3D ray tracing channel simulator is presented. Therefore we use Agilent’s RF design environment ADS® for system simulation and calculate the channel impulse response based on the data received from a 3D ray tracer in a Matlab® co-simulation. To reduce computing time the whole signal flow is processed in a complex baseband representation and scattering center models are used as substitute for complex polygon targets as further improvement. Nevertheless all effects occurring at harmonic bands due to nonlinearities in the transmitter and receiver circuits are well reflected in the simulation. A typical road scenario is simulated and the results show the capabilities of the simulation approach in terms of speed and accuracy.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {12. GMM/ITG-Fachtagung ANALOG},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059245},
    year = {2011},
    month = {11},
    faupublication = {yes},
    isbn = {9783800733699},
    pages = {104--109},
    peerreviewed = {unknown},
    title = {An Advanced Millimeter-Wave FMCW-Radar System Simulation Environment for the Automotive Sector},
    venue = {Erlangen, Germany},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "Eine erweiterte Millimeterwellen FMCW-Radar Systemsimulationsumgebung fuer den Einsatz im Automobilbereich" in ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, Erlangen, DE, 2011. [Bibtex]
    @inproceedings{dudek2011d,
    abstract = {In diesem Artikel stellen wir eine Simulationsumgebung fuer Millimeterwellen FMCW-Radare fuer den Einsatz im Automobilbereich vor, die einen 3D-Kanalsimulator beinhaltet. Dafuer nutzen wir Agilent's RF Entwicklungsumgebung ADS(R) fuer die Systemsimulation und berechnen die Impulsantwort des Kanals, basierend auf den Daten die von einem 3D-Raytracer generiert werden, in einer Matlab(R) Cosimulation. Um die Rechenzeit zu reduzieren findet der gesamte Signalfluss im komplexen Basisband statt und aufwaendige Polygonmodelle werden durch ihre Streuzentrenmodelle als weitere Verbesserung substituiert. Alle Effekte in den Harmonischen Zonen, die auf Grund von Nichtlinearitaeten im Sende- oder Empfangsmodul auftreten, werden in der Simulation korrekt wiedergegeben. Um die Leistungsfähigkeit des Simulationsansatzes, was Geschwindigkeit und Genauigkeit anbelangt, zu evaluieren, wird ein typisches Verkehrsszenario simuliert.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059244},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Eine erweiterte Millimeterwellen FMCW-Radar Systemsimulationsumgebung fuer den Einsatz im Automobilbereich},
    venue = {Erlangen, DE},
    }
  • [DOI] D. Brenk, J. Essel, J. Heidrich, R. Agethen, D. Kissinger, G. Hofer, G. Holweg, G. Fischer, and R. Weigel, "Energy-efficient wireless sensing using a generic ADC sensor interface within a passive multi-standard RFID transponder", IEEE Sensors Journal, vol. 11, iss. 11, pp. 2698-2710, 2011. [Bibtex]
    @article{brenk2011,
    author = {Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Agethen, Roman and Kissinger, Dietmar and Hofer, Günter and Holweg, Gerald and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059274},
    year = {2011},
    month = {11},
    doi = {10.1109/JSEN.2011.2156782},
    faupublication = {yes},
    issn = {1530-437X},
    journaltitle = {IEEE Sensors Journal},
    number = {11},
    pages = {2698--2710},
    peerreviewed = {Yes},
    shortjournal = {IEEE SENS J},
    title = {Energy-efficient wireless sensing using a generic ADC sensor interface within a passive multi-standard RFID transponder},
    volume = {11},
    }
  • [DOI] R. Agethen, F. Lurz, A. Schwarzmeier, G. Fischer, R. Weigel, and D. Kissinger, "An online telemetering system for mobile health parameter monitoring and medical assistance" in Internation Conference on Sensing Technology, Palmerston North, New Zealand, 2011, pp. 496-499. [Bibtex]
    @inproceedings{agethen2011b,
    author = {Agethen, Roman and Lurz, Fabian and Schwarzmeier, Andre and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    language = {English},
    booktitle = {Internation Conference on Sensing Technology},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059282},
    year = {2011},
    month = {11},
    day = {28},
    doi = {10.1109/ICSENST.2011.6137024},
    eventdate = {2011-11-28/2011-12-01},
    faupublication = {yes},
    pages = {496--499},
    peerreviewed = {Yes},
    title = {An online telemetering system for mobile health parameter monitoring and medical assistance},
    venue = {Palmerston North, New Zealand},
    }
  • J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Remote Powering Systems of Medical Implants for Maintenance Free Healthcare Applications" in European Microwave Conference (EuMC), Manchester, UK, 2011, pp. 131-134. [Bibtex]
    @inproceedings{walk2011c,
    abstract = {For favorable health care sensor devices especially long term monitoring sensors have to be completely imperceptible and maintenance free. A solution on these requirements is an implantable sensor system. The permittivity of body tissue and the desired distance to a remote station confronts the technology with several challenges. To avoid compromises and to be able to optimize both, communication and remote energy supply, we defined a novel concept and split frequency ranges. With the provided system energy can be rectified at 13.56 MHz from a remote station. Its powering level is 10mW. To store the energy a buffering concept is calculated based on a capacitor of about 4μF. To harvest energy for 0.2 s is enough to supply low power sensor devices and a MICS-Band transmitter for communication at 402 MHz-405 MHz. The active time of the implanted transmitter is in the range of 5ms with a transmission power of approximately 25μW.},
    author = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059278},
    year = {2011},
    month = {10},
    faupublication = {yes},
    pages = {131--134},
    peerreviewed = {unknown},
    title = {Remote Powering Systems of Medical Implants for Maintenance Free Healthcare Applications},
    venue = {Manchester, UK},
    }
  • M. Kamper, G. Ulbricht, R. Weigel, and G. Fischer, "Comparison of class A and class D RF amplifier operation with focus on reverse intermodulation and efficiency performance" in European Microwave Integrated Circuits Conference, Manchester, EN, 2011, pp. 272-275. [Bibtex]
    @inproceedings{kamper2011,
    abstract = {A Current Mode Class D (CMCD) power amplifier at 900 MHz is presented. After a theoretical analysis, a class D amplifier is designed, simulated and afterwards assembled and characterized. Thereby, a maximum drain efficiency of 80.6%, and a maximum power added efficiency (PAE) of 72.8% at a switching frequency of 864 MHz, and an output power of 28.2 dBm were obtained. A linear class A amplifier using the same transistor exhibits a drain efficiency of 48.9% and 48.0% PAE at a comparable output power. An analysis of the reverse intermodulation distortion (IMD) of the switched-mode class D amplifier in comparison to the class A amplifier shows a 15dB improvement of the third order intermodulation ratio. To the authors' knowledge, this is the first practical verification of the superior reverse intermodulation performance of switched-mode amplifiers.},
    author = {Kamper, Michael and Ulbricht, Gerald and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {European Microwave Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059285},
    year = {2011},
    month = {10},
    faupublication = {yes},
    keywords = {UHF power amplifiers; current-mode circuits; intermodulation distortion; radiofrequency amplifiers; current mode class D power amplifier; reverse intermodulation distortion},
    pages = {272--275},
    peerreviewed = {unknown},
    title = {Comparison of class A and class D RF amplifier operation with focus on reverse intermodulation and efficiency performance},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6102785},
    venue = {Manchester, EN},
    }
  • S. Schröter, L. Zimmermann, O. Schwender, G. Fischer, and A. Koelpin, "Demonstrator of a Scanning Receiver Subsystem for Cognitive Professional Wireless Microphone Systems" in Technical Symposium at ITU Telecom World 2011, Geneva, Switzerland, 2011, pp. 193-198. [Bibtex]
    @inproceedings{schroeter2011,
    abstract = {ProfessionalWireless Microphone Systems (PWMS), transmitting voice and music in live events such as concerts or conferences, demand the highest level of sound quality and reliability. Dropouts, noise and interference have to be prevented at any moment of the transmission. At present, these requirements can be fulfilled as PWMS utilize locally unused TV channels and thus operate in a protected radio environment. However, in the near future, the “Digital Dividend” will open the spectrum to other users, leading to less spectrum allocation to PWMS. In order to maintain the high quality of service of the radio links, the Specialist Task Force STF386 on Cognitive Programme Making and Special Events (C-PMSE) of the European Telecommunications Standards Institute (ETSI) proposed a proactive cognitive approach. A major part of this proposition is a Scanning Receiver Subsystem (SCS) that monitors the current spectrum occupation according to which a Cognitive Engine can dynamically configure the radio links. The SCS is composed of multiple Scanning Receivers (SCR) that measure the spectrum occupation at different locations within an event site and one or more Scanning Receiver Controllers (SCC). The SCC combine these observations to determine positions of interferers and estimate their future locations as well as their impact on the microphone links. This paper reviews the current activities of ETSI for standardization of a cognitive wireless microphone system with an in depth focus on the scanning receiver subsystem. Furthermore, the hardware of a low-cost scanning receiver, which has been developed and tested at our institute, is presented. The proposed receiver architecture fulfills the spectrum sensing capabilities recommended by ETSI and can be built at an affordable price, allowing the described proactive cognitive radio system to be realized.},
    author = {Schröter, Simon and Zimmermann, Lars and Schwender, O. and Fischer, Georg and Koelpin, Alexander},
    booktitle = {Technical Symposium at ITU Telecom World 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059292},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781457711480},
    pages = {193--198},
    peerreviewed = {unknown},
    title = {Demonstrator of a Scanning Receiver Subsystem for Cognitive Professional Wireless Microphone Systems},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6100954},
    venue = {Geneva, Switzerland},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "A millimeter-wave FMCW radar system simulator for automotive applications including nonlinear component models" in European Radar Conference (EuRAD), Manchester, UK, 2011, pp. 89-92. [Bibtex]
    @inproceedings{dudek2011c,
    abstract = {A fully differential millimeter wave frequency modulated continuous wave (FMCW) radar architecture is built up in Agilent's RF design and system simulation environment ADS® to investigate the influence of RF impairments on system level on the target signal. To take also the surroundings of the automotive scenario into account a 3D ray tracing channel simulator is coupled in a Matlab® co-simulation providing realistic data of the traffic situation. Therefore investigations on the performance of the radar frontend in an automotive long range radar (LRR) application are enabled, the functionality of the circuitry can be verified and components designed in the most beneficial way, so that the best performance is achieved with the available resources. For nonlinear behavior the frontend components are parameterized according to recently published values for 77GHz SiGe circuits. The functionality of the complete simulation environment is demonstrated by calculating a typical traffic situation.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059243},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781457711565},
    pages = {89--92},
    peerreviewed = {unknown},
    title = {A millimeter-wave FMCW radar system simulator for automotive applications including nonlinear component models},
    venue = {Manchester, UK},
    }
  • [DOI] M. Dudek, I. Nasr, D. Kissinger, R. Weigel, and G. Fischer, "The Impact of Phase Noise Parameters on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications" in CIE International Conference on Radar, Chengdu, China, 2011, pp. 494-497. [Bibtex]
    @inproceedings{dudek2011b,
    abstract = {Accurate system simulations have proven to be a valuable aid during the development process and help to decrease the time-to-market and the amount of design iterations, thus keeping development costs at a moderate level. Therefore a frequency-modulated continuous-wave (FMCW) radar system simulation environment has been built up, enabling for performance analysis of millimeter-wave radar frontends for automotive applications. A key parameter especially for radar systems applying the FMCW principle thereby is the linearity of the frequency ramp as it directly affects the quality of the target signal and thus the performance of the entire radar sensor. Hence in this scientific paper we investigate the influence of a phase noise afflicted VCO on the target signal detection, and the range resolution respectively. Leeson’s equation is applied to model oscillator phase noise and the results show which parameters are crucial for the radar system. Eventually a two-target scenario is calculated to substantiate the statements taken.},
    author = {Dudek, Manuel and Nasr, Ismail and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {CIE International Conference on Radar},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059242},
    year = {2011},
    month = {10},
    doi = {10.1109/CIE-RADAR.2011.6159587},
    faupublication = {yes},
    pages = {494--497},
    peerreviewed = {unknown},
    title = {The Impact of Phase Noise Parameters on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications},
    venue = {Chengdu, China},
    }
  • R. Rose, S. Zorn, A. Götz, G. Fischer, and R. Weigel, "A new technique to improve AoA using dual polarization" in European Microwave Conference, Manchester, UK, 2011, pp. 420-423. [Bibtex]
    @inproceedings{rose2011a,
    abstract = {This paper presents a technique for reducing the AoA measurement error caused by the influence of multipath propagation. This technique can be implemented using two approaches, where either the amplitude or the power of the received signals in the polarization domain can be implicated. After the polarization angle of the LOS signal is derived, the dual polarized antenna configuration has to be computationally rotated by this angle to reduce the influence of multipath components. The simulation results show, that the proposed technique leads to a significant reduction of AoA estimation error originated from a multipath component.},
    author = {Rose, Richard and Zorn, Stefan and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059318},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781612842356},
    pages = {420--423},
    peerreviewed = {unknown},
    title = {A new technique to improve AoA using dual polarization},
    venue = {Manchester, UK},
    }
  • [DOI] M. Jung, A. Ferizi, T. Ußmüller, G. Fischer, and R. Weigel, "A digital trimmable comparator for high precision ADCs in wireless sensor nodes" in Semiconductor Conference Dresden, Dresden, 2011, pp. 1-4. [Bibtex]
    @inproceedings{jung2011b,
    author = {Jung, Melanie and Ferizi, Alban and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {Semiconductor Conference Dresden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059309},
    year = {2011},
    month = {09},
    doi = {10.1109/SCD.2011.6068760},
    faupublication = {yes},
    isbn = {9781457704314},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A digital trimmable comparator for high precision ADCs in wireless sensor nodes},
    venue = {Dresden},
    }
  • F. Hausknecht, R. Mzyk, G. Dehm-Andone, G. Fischer, and R. Weigel, "A multichannel scanning receiver system for surveillance applications" in 6th Future Security Research conference, Berlin, 2011. [Bibtex]
    @inproceedings{hausknecht2011,
    author = {Hausknecht, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Fischer, Georg and Weigel, Robert},
    booktitle = {6th Future Security Research conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059247},
    year = {2011},
    month = {09},
    faupublication = {yes},
    keywords = {Multichannel; scanning; Receiver; surveillance},
    peerreviewed = {unknown},
    title = {A multichannel scanning receiver system for surveillance applications},
    venue = {Berlin},
    }
  • [DOI] R. Agethen, B. Lämmle, G. Fischer, R. Weigel, and D. Kissinger, "Design of an integrated 60 GHz cross-coupled oscillator in SiGe technology" in IEEE Semiconductor Conference Dresden, Dresden, Germany, 2011. [Bibtex]
    @inproceedings{agethen2011a,
    abstract = {This paper presents the design of an integrated fully differential 60GHz voltage controlled oscillator in SiGe technology featuring f t = 200 GHz high speed bipolar HBTs. The VCO is based on a differential Colpitts VCO. The core consumes an average amount of 26mA @ 3.3V supply voltage. The tuning bandwidth is about 12%. The utilized buffer at the output consumes additional 64 mA @ 3.3V and provides an output power of 13dBm over the tuning bandwidth. The phase noise @ 1MHz is less than -75 dBc/Hz.},
    author = {Agethen, Roman and Lämmle, Benjamin and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Semiconductor Conference Dresden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059283},
    year = {2011},
    month = {09},
    doi = {10.1109/SCD.2011.6068746},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Design of an integrated 60 GHz cross-coupled oscillator in SiGe technology},
    venue = {Dresden, Germany},
    }
  • [DOI] S. Glock, G. Fischer, R. Weigel, R. Hasholzner, and T. Ußmüller, "A state-based power estimation methodology at system level for integrated RF front-ends" in Semiconductor Conference Dresden 2011, Dresden, Germany, 2011, pp. 1-4. [Bibtex]
    @inproceedings{glock2011,
    abstract = {This paper introduces an approach to model the power consumption of analog and mixed-signal systems at system level. The method is based on power state machines and is practically applied to a zero-IF receiver. The power state machines model the static power consumption of components with respect to their current state or state transition. The power consumption per state and state transition, respectively, is obtained from a low-level circuit simulation or from measurement. The concept of power state machines can be used for any analog component and enables the simulation of heterogeneous systems with the benefit of a fast simulation time.},
    author = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Hasholzner, Ralf and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {Semiconductor Conference Dresden 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059236},
    year = {2011},
    month = {09},
    doi = {10.1109/SCD.2011.6068723},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A state-based power estimation methodology at system level for integrated RF front-ends},
    venue = {Dresden, Germany},
    }
  • [DOI] M. Jung, A. Ferizi, T. Ußmüller, G. Fischer, and R. Weigel, "A 9.7 mW 0.13 um CMOS PLL for Use in 24 GHz Sensor Nodes" in IEEE International Midwest Symposium on Circuits and Systems, Seoul, 2011, pp. 1-4. [Bibtex]
    @inproceedings{jung2011a,
    author = {Jung, Melanie and Ferizi, Alban and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Midwest Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059311},
    year = {2011},
    month = {08},
    doi = {10.1109/MWSCAS.2011.6026272},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 9.7 mW 0.13 um CMOS PLL for Use in 24 GHz Sensor Nodes},
    venue = {Seoul},
    }
  • T. Ußmüller, J. Heidrich, D. Brenk, J. Essel, G. Fischer, and R. Weigel, "Distance Measurement with UHF RFID Transponders" in IEEE MTT-S International Microwave Symposium, Workshop on Innovative and Highly Accurate Local Positioning Systems, Baltimore,MD, USA, 2011. [Bibtex]
    @inproceedings{ussmueller2011b,
    author = {Ußmüller, Thomas and Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE MTT-S International Microwave Symposium, Workshop on Innovative and Highly Accurate Local Positioning Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059324},
    year = {2011},
    month = {06},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Distance Measurement with UHF RFID Transponders},
    venue = {Baltimore,MD, USA},
    }
  • [DOI] M. Hofmann, T. Fersch, R. Weigel, G. Fischer, and D. Kissinger, "A novel approach to non-invasive blood glucose measurement based on RF transmission" in IEEE International Workshop on Medical Measurements and Applications, Bari, Italy, 2011, pp. 39-42. [Bibtex]
    @inproceedings{hofmann2011b,
    abstract = {A new approach to non-invasive blood parameter measuring is presented, which consists of two matched antennas for transmission based two port measurements. The current situation of patients suffering from diabetes mellitus and their need for novel blood sugar level measuring techniques is presented. Dielectric properties of body tissues are reviewed and their influence on transmission properties are estimated for plane wave propagation. A covered patch antenna and substrate integrated waveguide slot antenna has been designed, measured and compromised for glucose-concentration measurements. Further, several test locations are discussed with respect to an accurate measurement. The introduced antennas were optimized and fabricated with respect to the dielectric and mounting properties of human tissues.},
    author = {Hofmann, Maximilian and Fersch, Thomas and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE International Workshop on Medical Measurements and Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059275},
    year = {2011},
    month = {05},
    doi = {10.1109/MEMEA.2011.5966704},
    faupublication = {yes},
    isbn = {9781424493364},
    pages = {39--42},
    peerreviewed = {unknown},
    title = {A novel approach to non-invasive blood glucose measurement based on RF transmission},
    venue = {Bari, Italy},
    }
  • R. Weigel, G. Fischer, S. Zorn, R. Rose, and A. Götz, "Ortung von GSM Mobiltelefonen zur Vermissten- und Verschuettetensuche" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, DE, 2011. [Bibtex]
    @inproceedings{weigel2011c,
    author = {Weigel, Robert and Fischer, Georg and Zorn, Stefan and Rose, Richard and Götz, Alexander},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059251},
    year = {2011},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ortung von GSM Mobiltelefonen zur Vermissten- und Verschuettetensuche},
    venue = {Ulm, DE},
    }
  • G. Fischer, "Kognitives Spektrumsmanagement fuer professionelle Funkmikrofone (PMSE) - ETSI STF386" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, DE, 2011. [Bibtex]
    @inproceedings{fischer2011,
    author = {Fischer, Georg},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059323},
    year = {2011},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Kognitives Spektrumsmanagement fuer professionelle Funkmikrofone (PMSE) - ETSI STF386},
    venue = {Ulm, DE},
    }
  • [DOI] R. Agethen, L. M. Reuter, F. Lurz, G. Fischer, R. Weigel, and D. Kissinger, "A compact medical platform for mobile sensor fusion and data communication" in IEEE International Workshop on Medical Measurements and Applications Proceedings(MeMeA), Bari, Italy, 2011, pp. 111-114. [Bibtex]
    @inproceedings{agethen2011,
    author = {Agethen, Roman and Reuter, Lukas Michael and Lurz, Fabian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    language = {English},
    booktitle = {IEEE International Workshop on Medical Measurements and Applications Proceedings(MeMeA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059289},
    year = {2011},
    month = {05},
    day = {30},
    doi = {10.1109/MEMEA.2011.5966696},
    eventdate = {2011-05-30/2011-05-31},
    faupublication = {yes},
    pages = {111--114},
    peerreviewed = {Yes},
    title = {A compact medical platform for mobile sensor fusion and data communication},
    venue = {Bari, Italy},
    }
  • J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Remote Powering Systems for Implantable Sensor Platforms" in Radar, Communication & Measurement, RADCOM, Hamburg, Deutschland, 2011. [Bibtex]
    @inproceedings{walk2011a,
    author = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    booktitle = {Radar, Communication & Measurement, RADCOM},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059281},
    year = {2011},
    month = {04},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Remote Powering Systems for Implantable Sensor Platforms},
    venue = {Hamburg, Deutschland},
    }
  • T. Ußmüller, G. Fischer, and R. Weigel, "Simulation von FMCW-Synthesizern mittels optimierter Verhaltensmodelle" in Radcom - Radar, Communication and Measurement, Hamburg, 2011. [Bibtex]
    @inproceedings{ussmueller2011a,
    author = {Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {Radcom - Radar, Communication and Measurement},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059325},
    year = {2011},
    month = {04},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Simulation von FMCW-Synthesizern mittels optimierter Verhaltensmodelle},
    venue = {Hamburg},
    }
  • [DOI] M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "Consideration of higher frequency bands in accurate millimeter-wave FMCW-radar system simulations for automotive applications" in Wireless and Microwave Technology Conference, Clearwater Beach, USA, 2011, pp. 1-4. [Bibtex]
    @inproceedings{dudek2011a,
    abstract = {In this paper we demonstrate the necessity of taking harmonic bands into account when performing accurate simulations for millimeter-wave frequency-modulated continuous-wave (FMCW) radar systems. Especially under nonlinear conditions when harmonics are generated and influence the signal quality of target detection the higher frequency bands cannot be neglected anymore. In ordinary complex baseband simulations, that are considered as a means to keep the amount of data low in FMCW radar simulations, previous knowledge is needed to explicitly model the impact of effects in higher frequency bands on the specific circuit. Our approach takes the effects of multiples of the actual operating frequency into account, thus enabling higher accuracy while keeping the amount of data moderate. As an example for the capability of this simulation approach a scenario is calculated showing the difference between both simulation strategies.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {Wireless and Microwave Technology Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059241},
    year = {2011},
    month = {04},
    doi = {10.1109/WAMICON.2011.5872879},
    faupublication = {yes},
    isbn = {9781612840819},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Consideration of higher frequency bands in accurate millimeter-wave FMCW-radar system simulations for automotive applications},
    venue = {Clearwater Beach, USA},
    }
  • [DOI] J. Heidrich, D. Brenk, J. Essel, M. Heinrich, G. Hofer, G. Holweg, S. Schwarzer, J. Meyer, R. Herschmann, B. Geck, R. Weigel, and G. Fischer, "Multifunctional Reference Cells for Multistandard RFID Transponders", IEEE Transactions on Microwave Theory and Techniques, vol. 59, iss. 3, pp. 772-790, 2011. [Bibtex]
    @article{heidrich2011,
    abstract = {This paper at first illustrates implementation aspects and measurement results of a subcomponent for a multistandard RF identification (RFID) transponder. It is intended to be a common reference cell, both for basic UHF requirements and advanced application fields like local positioning and wireless sensing. Different single circuit topologies shown in previous studies or literature and their applicability for that RFID system are evaluated. After that, measurement results of two final circuit configurations, including a newly designed RC oscillator with metal-metal capacitors, are discussed and compared. Layout aspects for reducing the process variations and low power consumption are demonstrated. Simulation results show border conditions for the power supply of the transponder on chip level. Moreover, distance measurements with our first complete transponder compliant to the electronic product code protocol are shown. It includes the newly presented reference cells and other necessary transponder components. All chips are designed based on a 0.13-μm CMOS technology.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Heinrich, Matthias and Hofer, Günter and Holweg, Gerald and Schwarzer, Stefan and Meyer, J. and Herschmann, R. and Geck, Bernd and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059239},
    year = {2011},
    month = {03},
    doi = {10.1109/TMTT.2010.2098039},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {3},
    pages = {772--790},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Multifunctional Reference Cells for Multistandard RFID Transponders},
    volume = {59},
    }
  • W. Wang, G. Fischer, L. van den Oever, C. Korden, and R. Weigel, "Distributed Amplifier with Multiple Power Modes for Linear Mobile Phone Application" in German Microwave Conference, Darmstadt, DE, 2011, pp. 1-4. [Bibtex]
    @inproceedings{wang2011,
    abstract = {A tapered distributed power amplifier is designed for linear mobile phone power application, which covers the 3G mobile phone bandwidth from 800 MHz-2 GHz completely. It illustrates the opportunity of multiple power modes capability for power added efficiency (PAE) enhancement. Each power mode fulfills the WCDMA linearity specification up to a specific maximal output power.},
    author = {Wang, Wei and Fischer, Georg and van den Oever, Leon and Korden, Christian and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059237},
    year = {2011},
    month = {03},
    faupublication = {yes},
    keywords = {3G mobile communication; mobile handsets; power amplifiers; 3G mobile phone bandwidth; linear mobile phone application; multiple power modes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Distributed Amplifier with Multiple Power Modes for Linear Mobile Phone Application},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5760747},
    venue = {Darmstadt, DE},
    }
  • [DOI] J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Improvements of wireless communication and energy harvesting aspects for implantable sensor interfaces by using the Split Frequencies Concept" in IEEE Radio and Wireless Symposium, Phoenix, USA, 2011, pp. 406-409. [Bibtex]
    @inproceedings{walk2011,
    abstract = {This work addresses system aspects of implantable medical sensor devices. Different concepts for power supply and communication are compared and discussed. State of the art systems mainly rely on one common frequency for both wireless data and energy transmission. This publication highlights the specific pros and cons of different frequency ranges. The proposed Split Frequencies Concept (SFC) uses two separate frequency bands: One for energy harvesting and the second for data transmission. Hence the advantages of HF and UHF frequencies can be combined into a single system. Index Terms IEEE Terms Antennas , Batteries , Data communication , Energy harvesting , Permittivity , Wireless communication , Wireless sensor networks INSPEC Controlled Indexing biomedical communication , biomedical electronics , biosensors , energy harvesting , health care , inductive power transmission , low-power electronics Non Controlled Indexing energy harvesting , energy transmission , implantable medical sensor devices , implantable sensor interfaces , split frequencies concept , wireless communication , wireless data transmission Author Keywords biological tissue , biomedical communication , biomedical power supplies , energy storage , frequency domain analysis , implantable biomedical devices , permittivity References R. Egeler, Statement von Praesident Roderich Egeler, Pressekonferenz Bevoelkerungsentwicklung in Deutschland bis 2060 am 18. November 2009 in Berlin, Statistisches Bundesamt Std., November 2009. 12th coordinated Population Projection, Statistisches Bundesamt 2009 Std. [Online]. Available: www.destatis.de/bevoelkerungspyramide M. Golombeck, C. Riedel, and O. Doessel, "Calculation of the dielectric properties of biological tissue using simple models of cell patches," Biomedizinische Technik/Biomedical Engineering, vol. 47, no. s1a, pp. 253-256, 2002. S. Chen and V. Thomas, "Optimization of inductive rfid technology," in Electronics and the Environment, 2001. Proceedings of the 2001 IEEE International Symposium on, 2001, pp. 82 -87. (Pubitemid 32882655) Abstract |Full Text: PDF (416KB) N. Chaimanonart and D. J. Young, "Remote rf powering system for wireless mems strain sensors," IEEE Sensors Jounal, vol. 6, no. 2, 2006. Abstract |Full Text: PDF (1912KB) C. Peng, W. H. Kong, and D. J. Young, "Wireless batteryless implantable blood pressure monitoring microsystem for small laboratory animals," IEEE Sensors Journal, vol. 10, no. 2, 2010. W. Greatbatch, J. H. Lee, W. Mathias, M. Eldridge, J. R. Moser, and A. A. Schneider, "The solid-state lithium battery: A new improved chemical power source for implantable cardiac pacemakers," IEEE J BME, no. 5, pp. 317-324, 1971. R. C. O'Handley, J. K. Huang, D. C. Bono, and J. Simon, "Improved wireless transcutaneouse power transmision for in vivo applications," IEEE Sensors Journal, vol. 8, no. 1, 2008. K. M. Silay, C. Dehollain, and M. Declercq, "Improvement of power efficiency of inductive links for implantable devices," in Proc. Ph.D. Research in Microelectronics and Electronics PRIME 2008, 2008, pp. 229-232. Abstract |Full Text: PDF (475KB) K. M. Silay, D. Dondi, L. Larcher, M. Declercq, L. Benini, Y. Leblebici, and C. Dehollain, "Load optimization of an inductive power link for remote powering of biomedical implants," in Proc. IEEE Int. Symp. Circuits and Systems ISCAS 2009, 2009, pp. 533-536. J. Essel, D. Brenk, J. Heidrich, H. Reinisch, G. Hofer, G. Holweg, and R. Weigel, "Highly efficient multistandard rfids enabling passive wireless sensing," in Proc. Asia Pacific Microwave Conf. APMC 2009, 2009, pp. 2228-2231. Abstract |Full Text: PDF (685KB) J. Essel, D. Brenk, J. Heidrich, and R. Weigel, "A highly efficient uhf rfid frontend approach," in Proc. IEEE MTT-S Int. Microwave Workshop Wireless Sensing, Local Positioning, and RFID IMWS 2009, 2009, pp. 1-4. E. Y. Chow, Y. Ouyang, B. Beier, W. J. Chappell, and P. P. Irazoqui, "Evaluation of cardiovascular stents as antennas for implantable wireless applications," IEEE Transactions on Microwave Theory and Techniques, vol. 57, no. 10, Oct. 2009. Abstract |Full Text: PDF (2020KB) P. Li, R. Bashirullah, and J. C. Principe, "A low power battery management system for rechargeable wireless implantable electronics," in Proc. IEEE Int. Symp. Circuits and Systems ISCAS 2006, 2006. H. Honda, K. Shiba, E. Shu, K. Koshiji, T. Murai, J. Yana, T. Masuzawa, E. Tatsumi, Y. Taenaka, and H. Takano, "Study on lithium-ion secondary battery for implantable artificial heart," in Proc. 19th Annual Int Engineering in Medicine and Biology Society Conf. of the IEEE, vol. 5, 1997, pp. 2315-2317. ON THIS PAGE Abstract Index Terms References Brought to you by Universitatsbibliothek Erlangen Nurnberg Your institute subscribes to: IEEE/IET Electronic Library (IEL), VDE VERLAG Conference Proceedings What can I access? Terms of Use},
    author = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE Radio and Wireless Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059235},
    year = {2011},
    month = {01},
    doi = {10.1109/RWS.2011.5725471},
    faupublication = {yes},
    isbn = {9781424476879},
    pages = {406--409},
    peerreviewed = {unknown},
    title = {Improvements of wireless communication and energy harvesting aspects for implantable sensor interfaces by using the Split Frequencies Concept},
    venue = {Phoenix, USA},
    }
  • A. Götz, R. Rose, S. Zorn, G. Fischer, and R. Weigel, "A Burst Phase Analysis Technique for High Precision Time Delay Estimation of Frequency Hopping GSM Signals" in Asia-Pacific Microwave Conference (APMC), Melbourne, Australia, 2011, pp. 1446-1449. [Bibtex]
    @inproceedings{goetz2011b,
    abstract = {In this paper, a novel burst phase analysis technique for high precision time delay estimation of frequency hopping GSM signals is presented. The technique makes use of the increased bandwidth of frequency hopping waveforms and acquires and processes the signals in a coherent way. This way, the actual applicable bandwidth for time delay estimation and localization purposes is increased significantly. In case of E-GSM 900 systems, up to 35 MHz of bandwidth can be used which enables localization of mobile phones in the order of a few meters. The technique is therefore ideally suited for search and rescue applications. The presented method may also be applied to TETRA, DECT, IEEE 802.15.4 (ZigBee) or IEEE 802.15.1 (Bluetooth) signals.},
    author = {Götz, Alexander and Rose, Richard and Zorn, Stefan and Fischer, Georg and Weigel, Robert},
    booktitle = {Asia-Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059268},
    year = {2011},
    faupublication = {yes},
    keywords = {GSM; TDOA; Localization; Frequency Hopping},
    pages = {1446--1449},
    peerreviewed = {unknown},
    title = {A Burst Phase Analysis Technique for High Precision Time Delay Estimation of Frequency Hopping GSM Signals},
    venue = {Melbourne, Australia},
    }
  • A. Götz, R. Rose, S. Zorn, G. Fischer, and R. Weigel, "A Wideband Crosscorrelation Technique for High Precision Time Delay Estimation of Frequency Hopping GSM Signals" in European Microwave Conference (EuMC), Manchester, United Kingdom, 2011, pp. 33-36. [Bibtex]
    @inproceedings{goetz2011a,
    abstract = {In this paper, a novel wideband crosscorrelation technique for high precision time delay estimation of frequency hopping GSM signals is presented. The technique makes use of the increased bandwidth of frequency hopping waveforms and acquires and processes the signals in a coherent way. This way, the actual applicable bandwidth for time delay estimation and localization purposes is increased significantly. In case of E-GSM 900 systems, up to 35 MHz of bandwidth can be used which enables localization of mobile phones in the order of a few meters. The technique is therefore ideally suited for search and rescue applications. The presented method may also be applied to TETRA, DECT, IEEE 802.15.4 (ZigBee) or IEEE 802.15.1 (Bluetooth) signals.},
    author = {Götz, Alexander and Rose, Richard and Zorn, Stefan and Fischer, Georg and Weigel, Robert},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059267},
    year = {2011},
    faupublication = {yes},
    keywords = {GSM; TDOA; Localization; Frequency Hopping},
    pages = {33--36},
    peerreviewed = {unknown},
    title = {A Wideband Crosscorrelation Technique for High Precision Time Delay Estimation of Frequency Hopping GSM Signals},
    venue = {Manchester, United Kingdom},
    }
  • [DOI] A. Götz, S. Zorn, R. Rose, G. Fischer, and R. Weigel, "A Time Difference of Arrival System Architecture for GSM Mobile Phone Localization in Search and Rescue Scenarios" in Workshop on Positioning, Navigation and Communication (WPNC), Dresden, Germany, 2011, pp. 24-27. [Bibtex]
    @inproceedings{goetz2011,
    abstract = {In this work, a novel architecture of a time difference of arrival based localization system for GSM mobile phones is proposed. The system is well-suited for search and rescue scenarios and comprises receiving stations for GSM signals, a dedicated GSM base station and a radio frequency jamming system for GSM and UMTS signals. The system may be operated in the E-GSM 900 band providing high penetration of the covering debris material and a sufficient overall bandwidth for the time difference of arrival measurements. In this case, the best attainable accuracy of localization is shown to be in the scale of 5 m. The components of the system are described in more detail and possible implementations are proposed. The system may also be applied for the localization of UMTS mobile phones making use of the integrated GSM functionality. The proposed system represents a novel approach for time difference of arrival based localization of mobile phones in search and rescue scenarios.},
    author = {Götz, Alexander and Zorn, Stefan and Rose, Richard and Fischer, Georg and Weigel, Robert},
    booktitle = {Workshop on Positioning, Navigation and Communication (WPNC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059284},
    year = {2011},
    doi = {10.1109/WPNC.2011.5961009},
    faupublication = {yes},
    keywords = {GSM; Localization; TDOA},
    pages = {24--27},
    peerreviewed = {unknown},
    title = {A Time Difference of Arrival System Architecture for GSM Mobile Phone Localization in Search and Rescue Scenarios},
    venue = {Dresden, Germany},
    }

2010

  • M. Dudek, R. Wahl, D. Kissinger, R. Weigel, and G. Fischer, "Millimeter Wave FMCW Radar System Simulations including a 3D Ray Tracing Channel Simulator" in Asia-Pacific Microwave Conference (APMC), Yokohama, Japan, 2010, pp. 1665-1668. [Bibtex]
    @inproceedings{dudek2010a,
    abstract = {In this paper a millimeter-wave radar system simulation environment for frequency-modulated continuous-wave (FMCW) radar using a 3D ray tracing channel simulator is presented. Therefore we use Agilents' RF design environment ADS® for system simulation and calculate the channel impulse response based on the data received from a 3D ray tracer in a Matlab® co-simulation. To reduce computing time the whole signal flow is processed in a complex baseband representation and scattering center models are used as substitute for complex polygon targets as further improvement. Nevertheless all effects occurring at harmonic bands and at DC due to nonlinearities in the transmitter and receiver circuits are well reflected in the simulation. A typical road scenario is simulated and the results show the capabilities of the simulation technique in terms of speed and accuracy.},
    author = {Dudek, Manuel and Wahl, René and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {Asia-Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059025},
    year = {2010},
    month = {12},
    faupublication = {yes},
    isbn = {9781424475902},
    keywords = {Computational modeling; CW radar; FM radar; radar computing; ray tracing; road vehicle radar; millimeter wave radar; 3D ray tracing channel simulator; Matlab cosimulation; channel impulse response calculation; complex polygon target; frequency-modulated continuous-wave radar; millimeter-wave radar system simulation; scattering center model; RF impairments},
    pages = {1665--1668},
    peerreviewed = {unknown},
    title = {Millimeter Wave FMCW Radar System Simulations including a 3D Ray Tracing Channel Simulator},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5728244},
    venue = {Yokohama, Japan},
    }
  • J. Heidrich, D. Brenk, J. Essel, S. Schwarzer, R. Weigel, and G. Fischer, "Distance Measurement with UHF Transponders by Means of Modulated Backscattering" in 20th International Conference on Applied Electromagnetics and Communications (ICECom 2010), Dubrovnik, Croatia, 2010. [Bibtex]
    @inproceedings{heidrich2010e,
    abstract = {This paper evaluates the implementation of a Round-Trip-of-Flight (RToF) technique into a UHF transponder. Different possible transponder architectures are investigated and measurement results for a passive design are shown at circuit level. The chip is designed based on a 0.13 μm CMOS technology.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Schwarzer, Stefan and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {20th International Conference on Applied Electromagnetics and Communications (ICECom 2010)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059065},
    year = {2010},
    month = {09},
    faupublication = {yes},
    isbn = {9781612849980},
    keywords = {CMOS integrated circuits; CMOS technology; Radar tracking; Transponders; electromagnetic wave scattering; CMOS; RFID; RToF technique; UHF transponder; distance measurement; modulated backscattering; round-trip-of-flight technique; EPC; FMCW; Radio Frequency Identification; local positioning; low-power; low-voltage},
    peerreviewed = {unknown},
    title = {Distance Measurement with UHF Transponders by Means of Modulated Backscattering},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5729714},
    venue = {Dubrovnik, Croatia},
    }
  • [DOI] J. Heidrich, D. Brenk, J. Essel, M. Heinrich, M. Jung, G. Hofer, G. Holweg, R. Weigel, and G. Fischer, "Design of a Low-Power Voltage Regulator for RFID Applications" in IEEE R8 International Conference On Computational Technologies in Electrical And Electronics Engineering 2010 (SIBIRCON 2010), Listvyanka, Russia, 2010. [Bibtex]
    @inproceedings{heidrich2010d,
    abstract = {This paper briefly reviews common state-of-the-art architectures of voltage regulators and their applicability to RFID. After that the design of a Low Drop-out (LDO) regulator using active resistances is presented, especially suitable for RFID applications. The chip is designed based on a 0.13 μm CMOS technology.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Heinrich, Matthias and Jung, Melanie and Hofer, Günter and Holweg, Gerald and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE R8 International Conference On Computational Technologies in Electrical And Electronics Engineering 2010 (SIBIRCON 2010)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059061},
    year = {2010},
    month = {07},
    doi = {10.1109/SIBIRCON.2010.5555135},
    faupublication = {yes},
    isbn = {9781424476251},
    keywords = {Radiofrequency identification; Regulators; Transponders; Voltage control; CMOS integrated circuits; low-power electronics; voltage regulators; RFID; CMOS technology; low drop-out regulator; low-power voltage regulator; LDO; reference circuit; low-voltage; reference voltage; wireless sensing},
    peerreviewed = {unknown},
    title = {Design of a Low-Power Voltage Regulator for RFID Applications},
    venue = {Listvyanka, Russia},
    }
  • J. Heidrich, D. Brenk, J. Essel, M. Heinrich, G. Hofer, G. Holweg, R. Weigel, and G. Fischer, "Design of an Electronically Adaptable Low-power Reference Cell for Low-cost CMOS Processes" in 18th International Conference on Microwave Radar and Wireless Communications (MIKON), Vilnius, Lithuania, 2010. [Bibtex]
    @inproceedings{heidrich2010c,
    abstract = {This paper presents the design of a voltage reference cell suitable for low-voltage and low-power applications without the usage of bipolar structures. The respective reference voltage can be trimmed within a certain range to compensate the unavoidable process variations. The chip is designed based on a 0.13 μm CMOS technology.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Heinrich, Matthias and Hofer, Günter and Holweg, Gerald and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {18th International Conference on Microwave Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059062},
    year = {2010},
    month = {06},
    faupublication = {yes},
    isbn = {9781424452880},
    keywords = {CMOS technology; circuits; Photonic band gap; Joining processes; Temperature dependence; Threshold voltage; CMOS; RFID; bias cell; low-power; low-voltage; reference circuit; reference voltage; wireless sensing},
    peerreviewed = {unknown},
    title = {Design of an Electronically Adaptable Low-power Reference Cell for Low-cost CMOS Processes},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5540654},
    venue = {Vilnius, Lithuania},
    }
  • A. Samulak, G. Fischer, and R. Weigel, "Design and Simulation GaN based Class-S PA at 900MHz" in 18th International Conference on Microwave Radar and Wireless Communications (MIKON), Vilnius, Lithuania, 2010. [Bibtex]
    @inproceedings{samulak2010,
    abstract = {A Class-S Power Amplifier architecture seems to be an attractive alternative for classical PAs due to offered very high efficiency operation. Switching mode PA principle assumes combined operation based on digital, single - bit Delta-Sigma (ΔΣ) modulated signals and RF analog signals, what complicates design and analysis procedures. However the Class-S PA topology is known, there are not any universal design methods which can be unambiguous applied to considered architecture. Presented work defines and describes design method for Class-S PA based on GaN HEMT transistors. Moreover main simulation results for Class-S architecture based on Current Switching Class-D (CSCD) configuration at the carrier frequency of 900 MHz have been performed.},
    author = {Samulak, Andrzej and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {18th International Conference on Microwave Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059051},
    year = {2010},
    month = {06},
    faupublication = {yes},
    isbn = {9781424452880},
    keywords = {Delta modulation; Digital modulation; Gallium nitride; High power amplifiers; Class S; switching PA; GaN},
    peerreviewed = {unknown},
    title = {Design and Simulation GaN based Class-S PA at 900MHz},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5540454},
    venue = {Vilnius, Lithuania},
    }
  • R. Mzyk and G. Fischer, "Modeling mechanical dynamics of MEMS self actuation in ADS and its application" in IEEE International Microwave Symposium, Anaheim (California), USA, 2010. [Bibtex]
    @inproceedings{mzyk2010,
    author = {Mzyk, Raphael and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059050},
    year = {2010},
    month = {05},
    faupublication = {yes},
    keywords = {RF MEMS; self actuation; mechanical dynamics},
    peerreviewed = {unknown},
    title = {Modeling mechanical dynamics of MEMS self actuation in ADS and its application},
    venue = {Anaheim (California), USA},
    }
  • [DOI] J. Heidrich, D. Brenk, J. Essel, M. Heinrich, G. Hofer, G. Holweg, R. Weigel, and G. Fischer, "Design of a Low-Voltage Reference Circuit with Reconfigurable Temperature Range for RFID Applications" in IEEE International Microwave Symposium, Anaheim, USA, 2010. [Bibtex]
    @inproceedings{heidrich2010b,
    abstract = {This paper describes the design of a current-mode bandgap for RFID applications. Its temperature compensation network can be set between two states which enables different compensation criteria. In the first state the temperature dependent behavior is optimized around ambient temperature, in the other state a better adaption at the higher temperature range can be achieved. The chip is designed in a 0.13µm CMOS technology. It was developed at the Institute for Electronics Engineering within the scope of a research project supported by the Bavarian Research Foundation.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Heinrich, Matthias and Hofer, Günter and Holweg, Gerald and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059063},
    year = {2010},
    month = {05},
    doi = {10.1109/MWSYM.2010.5516987},
    faupublication = {yes},
    isbn = {9781424460564},
    keywords = {CMOS technology; Photonic band gap; CMOS circuits; Radiofrequency identification; RFID; Temperature dependence; Temperature distribution; reference; low voltage},
    peerreviewed = {unknown},
    title = {Design of a Low-Voltage Reference Circuit with Reconfigurable Temperature Range for RFID Applications},
    venue = {Anaheim, USA},
    }
  • J. Essel, D. Brenk, J. Heidrich, G. Fischer, and R. Weigel, "Passive CMOS RFIDs: Neue Features für die Entfernungsmessung und die Sensorik" in Sensoren und Messsysteme, Nuremberg, Germany, 2010. [Bibtex]
    @inproceedings{essel2010,
    abstract = {In diesem Beitrag wird ein neuartiger RFID Transponder vorgestellt, welcher sowohl bei 13,56 MHz (HF) als auch bei 868 MHz (UHF) eingesetzt werden kann. Die Funktionalität dieses Multistandard RFID Transponders wurde zusätzlich um eine Sensorschnittstelle mit einem integrierten Temperatursensor und eine Ortungsfunktion erweitert. Für das Sensorschnittstelle wurde ein neuer ADU entworfen, welcher nach dem Prinzip der sukzessiven Approximation (SAR) arbeitet. Die gesamte Sensorschnittstelle benötigt für 100 kSps lediglich 1.4 myA bei 0.9V Versorgungsspannung.Die gemessene Effizienz des analogen CMOS Frontends für eine DC Ausgangsleistung von 10 myW beträgt ca. 7%, und die maximale Effizienz beträgt 15% bei UHF. Der für die Ortungsfunktion notwendige Oszillator wurde mit einer sehr geringen Stromaufnahme entworfen, welcher auch bei schwankender Versorgungsspannung einen stabilen Referenztakt erzeugt. Dies war notwendig, da der Transponder während der Ortung die vom Lesegerät ausgesendete FMCW-Rampe mit konstanter Frequenz moduliert. Die Sensorschnittstelle sowie die Ortungsfunktion werden protokollkonform über Custom Commands vom Lesegerät aktiviert.},
    author = {Essel, Jochen and Brenk, Daniel and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    booktitle = {Sensoren und Messsysteme},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059041},
    year = {2010},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Passive CMOS RFIDs: Neue Features für die Entfernungsmessung und die Sensorik},
    venue = {Nuremberg, Germany},
    }
  • [DOI] J. Heidrich, D. Brenk, J. Essel, S. Schwarzer, K. Seemann, G. Fischer, and R. Weigel, "The Roots, Rules, and Rise of RFID", IEEE Microwave Magazine, vol. 11, iss. 3, pp. 78-86, 2010. [Bibtex]
    @article{heidrich2010a,
    abstract = {This article has offered a brief excerpt of the basic requirements and current development trends in (passive) RFID systems in different application areas. Even after reaching a sophisticated state of development, RFID technology is still dependent on sufficient acceptance at the market. Conventional bar code systems lack programmability, have low storage capability, and need a line-of-sight connection to the reader. If the fall in prices for low-cost tags continues, barcodes could be largely replaced in some years. In this case, additional features like positioning or sensing will become even more attractive for commercial and industrial application fields.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Schwarzer, Stefan and Seemann, Kay and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059064},
    year = {2010},
    month = {05},
    doi = {10.1109/MMM.2010.936075},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {Access control; Antenna accessories; Antennas and propagation; Design engineering; Knowledge engineering; Radiofrequency identification; Signal processing; Supply chain management; Tagging; Transponders},
    number = {3},
    pages = {78--86},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {The Roots, Rules, and Rise of RFID},
    volume = {11},
    }
  • G. Fischer, M. Perez-Guirao, W. Bilz, E. Reihl, R. Circa, and A. Schmidt, "Cognitive Systems for the Professional Audio Industry: a Step Forward" in 6th Karlsruhe Workshop on Software Radios, Karlsruhe, 2010. [Bibtex]
    @inproceedings{fischer2010,
    author = {Fischer, Georg and Perez-Guirao, M. and Bilz, W. and Reihl, E. and Circa, R. and Schmidt, Axel},
    booktitle = {6th Karlsruhe Workshop on Software Radios},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059067},
    year = {2010},
    month = {03},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Cognitive Systems for the Professional Audio Industry: a Step Forward},
    venue = {Karlsruhe},
    }
  • [DOI] J. Heidrich, D. Brenk, J. Essel, S. Schwarzer, R. Herschmann, B. Geck, G. Fischer, and R. Weigel, "Local positioning with sensor-enabled passive multistandard RFID transponders", Advances in Radio Science : Kleinheubacher Berichte, vol. 8, pp. 263-273, 2010. [Bibtex]
    @article{heidrich2010,
    abstract = {RFID is used today in many fields of every day life like access control, anti-theft protection or logistics. Within this article a short overview of the basic RFID principles and the EPC protocol flow is given at first. Afterwards new design approaches for RFID systems within the scope of the research project RFID-S are presented.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Schwarzer, Stefan and Herschmann, R. and Geck, Bernd and Fischer, Georg and Weigel, Robert},
    publisher = {Copernicus},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059023},
    year = {2010},
    doi = {10.5194/ARS-8-263-2010},
    faupublication = {yes},
    issn = {1684-9965},
    journaltitle = {Advances in Radio Science : Kleinheubacher Berichte},
    pages = {263--273},
    peerreviewed = {Yes},
    title = {Local positioning with sensor-enabled passive multistandard RFID transponders},
    volume = {8},
    }

2009

  • [DOI] J. Heidrich, D. Brenk, J. Essel, G. Hofer, G. Holweg, G. Fischer, and R. Weigel, "Low Voltage Reference Cells for UHF Transponders with Advanced Features" in IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems, Tel Aviv, Israel, 2009, pp. 1-8. [Bibtex]
    @inproceedings{heidrich2009a,
    abstract = {In this paper a low voltage RC oscillator for standard RFID applications and local positioning is presented. Its bias current is provided by a current-mode bandgap whose reference voltage can also be used for enhanced transponder applications like sensing. The chip is designed in a 0.13 ¿m CMOS technology with p substrate. It was developed at the Institute for Electronics Engineering within the scope of a research project supported by the Bavarian Research Foundation.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Hofer, Günter and Holweg, Gerald and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058974},
    year = {2009},
    month = {11},
    doi = {10.1109/COMCAS.2009.5385971},
    faupublication = {yes},
    keywords = {CMOS technology; RFID applications; UHF transponders; CMOS integrated circuits},
    pages = {1--8},
    peerreviewed = {unknown},
    title = {Low Voltage Reference Cells for UHF Transponders with Advanced Features},
    venue = {Tel Aviv, Israel},
    }
  • [DOI] B. Sewiolo, B. Waldmann, G. Fischer, and R. Weigel, "A Novel Cascode Power Matching Approach for High Efficiency Tapered Traveling Wave Power Amplifiers in SiGe MiCMOS" in International Conference on Ultra-Wideband, Vancouver, Canada, 2009. [Bibtex]
    @inproceedings{sewiolo2009g,
    author = {Sewiolo, Benjamin and Waldmann, Benjamin and Fischer, Georg and Weigel, Robert},
    booktitle = {International Conference on Ultra-Wideband},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058995},
    year = {2009},
    month = {11},
    doi = {10.1109/ICUWB.2009.5288710},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Novel Cascode Power Matching Approach for High Efficiency Tapered Traveling Wave Power Amplifiers in SiGe MiCMOS},
    venue = {Vancouver, Canada},
    }
  • [DOI] B. Sewiolo, G. Fischer, and R. Weigel, "A 12-GHz High-Efficiency Tapered Traveling-Wave Power Amplifier With Novel Power Matched Cascode Gain Cells Using SiGe HBT Transistors", IEEE Transactions on Microwave Theory and Techniques, vol. 57, iss. 10, pp. 2329-2336, 2009. [Bibtex]
    @article{sewiolo2009f,
    abstract = {In this paper, we present the analysis, design, and implementation of an integrated power distributed amplifier (DA), fabricated in a low-cost 0.25-mum SiGe BiCMOS technology. The circuit consists of four novel inductively peaked cascode gain cells, which are capacitively coupled to the base line for power optimization and bandwidth enhancement. Due to the tapered collector line, no output termination resistor is required, which provides higher efficiency. Design tradeoffs for maximum bandwidth, gain, output power, and efficiency are discussed by means of analytical calculations and simulations. A gain of 11 dB with a gain flatness of plusmn1 dB has been measured over a frequency range from 1 to 12 GHz. 19.5-dBm output power is obtained at the 1-dB compression point (P1 dB) in the desired frequency range with an associated power-added efficiency of 22.1% and a maximum output third-order intercept point of 31.5 dBm. The power dissipation of the amplifier is 400 mW from a 5-V supply. On-chip biasing is implemented via low dropout voltage reference driven by a bandgap voltage source. To the authors' knowledge, this is the highest output power achieved by an HBT DA in SiGe technology in this frequency range. The chip size is 2.1 mm2. Good agreement between simulation and measurement were achieved.},
    author = {Sewiolo, Benjamin and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058993},
    year = {2009},
    month = {10},
    doi = {10.1109/TMTT.2009.2029029},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {10},
    pages = {2329--2336},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A 12-GHz High-Efficiency Tapered Traveling-Wave Power Amplifier With Novel Power Matched Cascode Gain Cells Using SiGe HBT Transistors},
    volume = {57},
    }
  • R. Mzyk and G. Fischer, "Großsignalverhalten von MEMS Varaktoren als Abstimmelement in Duplexfiltern für Basisstationen" in MikroSystemTechnik KONGRESS 2009, Berlin, 2009. [Bibtex]
    @inproceedings{mzyk2009,
    abstract = {Eine Methode zur Abstimmung hochgütiger planarer Filter mit einem MEMS Varaktor wird vorgestellt. Dabei werden auf der Basis von Verhaltens- und Circuit Level Simulationsmodellen sowohl Klein- also auch Großsignalanalysen durchgeführt. Neben einem Abstimmbereich des Resonators von 860 MHz bis 970 MHz wird die hervorragende Linearität mit einem simulierten Intermodulationsabstand IM3 von 76,3 dBc dargestellt. Vor dem Hintergrund einer Verwendung des abstimmbaren Resonators in Duplexfiltern moderner Mobilfunkbasistationen werden zudem Simulationen zur Bestimmung von EVM und ACLR ausgewertet.},
    author = {Mzyk, Raphael and Fischer, Georg},
    booktitle = {MikroSystemTechnik KONGRESS 2009},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058965},
    year = {2009},
    month = {10},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Großsignalverhalten von MEMS Varaktoren als Abstimmelement in Duplexfiltern für Basisstationen},
    url = {http://www.vde-verlag.de/proceedings-en/453183150.html},
    venue = {Berlin},
    }
  • G. Fischer, T. Lautenbacher, A. Koelpin, R. Mzyk, and R. Weigel, "Passive Metamaterial Structures for Use in Microwave and RF Applications" in ITG Topical Meeting New Microwave Materials, Non-Destructive Testing and Short-Range Imaging, Erlangen, 15. October 2009, Erlangen Germany, 2009. [Bibtex]
    @inproceedings{fischer2009a,
    abstract = {Possibilities for improving electrical system properties concerning size reduction, efficiency, multiband operation and tuning by using Metamaterial devices are presented. Two approaches in designing Metamaterial structures, i.e. the resonant type as well as the dual transmission line concept, are demonstrated by examples. With the dual transmission line concept, a dualband 90° Composite Right and Left Handed transmission line (CRLH TL) is implemented for use in dualband hybrid couplers and Wilkinson power dividers. Therefore new design guidelines for reliable functionality and superior performance were established for the stated implementation. The resonant type approach is based on resonant structures comprising of split ring resonators (SRR). Examples of using high-Q split ring resonators in duplex filters and in current switched class-S amplifiers are evaluated. Furthermore different aspects and possibilities in tuning SRRs by using MEMS devices are highlighted.},
    author = {Fischer, Georg and Lautenbacher, Thomas and Koelpin, Alexander and Mzyk, Raphael and Weigel, Robert},
    booktitle = {ITG Topical Meeting New Microwave Materials, Non-Destructive Testing and Short-Range Imaging, Erlangen, 15. October 2009},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058979},
    year = {2009},
    month = {10},
    faupublication = {yes},
    keywords = {Metamaterial; Composite Right and Left Handed CRLH; Dual Transmission Line Concept; Dualband; Hybrid Coupler; Wilkinson Power Divider; Split Ring Resonator SRR; High-Q; Duplex Filter; Class-S Amplifier; Tuning},
    peerreviewed = {unknown},
    title = {Passive Metamaterial Structures for Use in Microwave and RF Applications},
    venue = {Erlangen Germany},
    }
  • [DOI] B. Sewiolo, G. Fischer, and R. Weigel, "A 30 GHz Variable Gain Amplifier With High Output Voltage Swing for Ultra-Wideband Radar", IEEE Microwave and Wireless Components Letters, vol. 19, iss. 9, pp. 590-592, 2009. [Bibtex]
    @article{sewiolo2009d,
    abstract = {This paper reports on the analysis, design and characterization of a 30 GHz fully differential variable gain amplifier for ultra-wideband radar systems. The circuit consists of a variable gain differential stage, which is fed by two cascaded emitter followers. Capacitive degeneration and inductive peaking are used to enhance bandwidth. The maximum differential gain is 11.5 dB with plusmn1.5 dB gain flatness in the desired frequency range. The amplifier gain can be regulated from 0 dB up to 11.5 dB. The circuit exhibits an output 1 dB compression point of 12 dBm. The measured differential output voltage swing is 1.23 Vpp. The 0.75 mm2 broadband amplifier consumes 560 mW at a supply voltage of plusmn3.3 V. It is manufactured in a low-cost 0.25 mum SiGe BiCMOS technology with a cut-off frequency of 75 GHz. The experimental results agree very well with the simulated response. A figure of merit has been proposed for comparing the amplifier performance to previously reported works.},
    author = {Sewiolo, Benjamin and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058998},
    year = {2009},
    month = {09},
    doi = {10.1109/LMWC.2009.2027094},
    faupublication = {yes},
    issn = {1531-1309},
    journaltitle = {IEEE Microwave and Wireless Components Letters},
    number = {9},
    pages = {590--592},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW WIREL CO},
    title = {A 30 GHz Variable Gain Amplifier With High Output Voltage Swing for Ultra-Wideband Radar},
    volume = {19},
    }
  • [DOI] J. Heidrich, D. Brenk, J. Essel, G. Fischer, R. Weigel, and S. Schwarzer, "Local Positioning With Passive UHF RFID Transponders" in IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID, Cavtat, Croatia, 2009, pp. 1-4. [Bibtex]
    @inproceedings{heidrich2009,
    abstract = {This paper describes the theory of distance measurements with passive UHF transponders using the principle of modulated backscattering. The method was evaluated with the analogue frontend of a passive RFID chip for the UHF range. The chip was designed in a 0.14mum CMOS technology.},
    author = {Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Fischer, Georg and Weigel, Robert and Schwarzer, Stefan},
    booktitle = {IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058954},
    year = {2009},
    month = {09},
    doi = {10.1109/IMWS2.2009.5307861},
    faupublication = {yes},
    keywords = {CMOS technology; chip design; distance measurement; local positioning; modulated backscattering; passive UHF RFID transponder; size 0.14 mum; CMOS integrated circuits; UHF devices; backscatter; distance measurement; microprocessor chips; radiofrequency identification; transponders},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Local Positioning With Passive UHF RFID Transponders},
    venue = {Cavtat, Croatia},
    }
  • [DOI] B. Sewiolo, G. Vinci, G. Fischer, and R. Weigel, "Mixed-Mode S-Parameter Design of Ultra-Wideband Coupled-Line Baluns" in International Conference on Electromagnetics in Advanced Applications, Torino, Italy, 2009, pp. 55-58. [Bibtex]
    @inproceedings{sewiolo2009e,
    abstract = {The design and mixed-mode S-parameter characterization of a 2.5-10.5 GHz bandwidth balun are presented in this paper. It consists of a two-stage Wilkinson divider for power splitting followed by two coupled line sections for plusmn 90deg phase shifting. To increase the even-mode and decrease the odd-mode impedances patterned ground shielding is used. The compact balun structure occupies an area of less than 5 mm2 and has been fabricated on a conventional double-layer printed circuit board to validate simulation results by measurements. The manufactured balun has a input- and output return loss better than -10 dB over the entire frequency range. The measured insertion loss is les1 dB. Good agreement between simulation and measurement were achieved.},
    author = {Sewiolo, Benjamin and Vinci, Gabor and Fischer, Georg and Weigel, Robert},
    booktitle = {International Conference on Electromagnetics in Advanced Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058994},
    year = {2009},
    month = {09},
    doi = {10.1109/ICEAA.2009.5297626},
    faupublication = {yes},
    keywords = {compact balun structure; double-layer printed circuit board; even-mode impedance; frequency 2.5 GHz to 10 GHz; insertion loss; mixed-mode S-parameter design; odd-mode impedance; patterned ground shielding; phase shifting; power splitting; return loss; two-stage Wilkinson divider; ultrawideband coupled-line balun; S-parameters; baluns; losses; power dividers; printed circuits; shielding; ultra wideband technology},
    pages = {55--58},
    peerreviewed = {unknown},
    title = {Mixed-Mode S-Parameter Design of Ultra-Wideband Coupled-Line Baluns},
    venue = {Torino, Italy},
    }
  • G. Fischer and R. Mzyk, "High-Q Planar Filter Platform Incorporating Macro MEMS Tuning Elements" in IEEE International Microwave Symposium, Boston, USA, 2009. [Bibtex]
    @inproceedings{fischer2009,
    abstract = {Duplex filters as used in infrastructure equipment for wireless networks require high selectivity and high power handling. This typically is contrary to tunability. The contribution shows a planar filter platform based on coupled Metamaterial Split Ring Resonators in suspended stripline configuration. A macro MEMS varactor device with piezoelectric actuation is introduced for tuning. Its characteristics are large tunability, large power handling and moderate Q factor. The degradation of the resonators Q factor is kept low as a loose coupling of the MEMS is assumed. Results of tunable passband characteristics are presented. The impact at system level measured by EVM and ACPR degradation is neglectable thanks to its mechanical inertia. An SDD (Symbolically Defined Device) model suited for ADS that captures the mechanical dynamics by a second order differential equation is presented that can be used with all simulation engines of ADS (S, HB, transient and envelope).},
    author = {Fischer, Georg and Mzyk, Raphael},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059012},
    year = {2009},
    month = {06},
    faupublication = {yes},
    keywords = {Split Ring Resonators; High Q; Tunable; filter},
    peerreviewed = {unknown},
    title = {High-Q Planar Filter Platform Incorporating Macro MEMS Tuning Elements},
    venue = {Boston, USA},
    }
  • [DOI] B. Sewiolo, D. Kissinger, G. Fischer, and R. Weigel, "A High-Gain High-Linearity Tapered Distributed Amplifier for Ultra-Wideband-Applications Using a Low Cost SiGe BiCMOS Technology" in IEEE Wireless and Microwave Technology Conference, Clearwater, FL, 2009, pp. 1-4. [Bibtex]
    @inproceedings{sewiolo2009c,
    author = {Sewiolo, Benjamin and Kissinger, Dietmar and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE Wireless and Microwave Technology Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058999},
    year = {2009},
    month = {04},
    doi = {10.1109/WAMICON.2009.5207301},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A High-Gain High-Linearity Tapered Distributed Amplifier for Ultra-Wideband-Applications Using a Low Cost SiGe BiCMOS Technology},
    venue = {Clearwater, FL},
    }
  • [DOI] E. Lourandakis, G. Fischer, and R. Weigel, "Characterization and Modeling of Continuously Tunable MEMS Varactor" in German Microwave Conference, 2009, 2009, pp. 1-4. [Bibtex]
    @inproceedings{lourandakis2009b,
    abstract = {In this work a circuit model for a continuously tunable varactor is presented which is based on a microelectromechanical system (MEMS). This behavioral model can be implemented in commercially available simulation tools and allows for complete circuit simulations in terms of small- and large-signal performance, as well as for transient and envelope responses. For the present implementation Agilent's ADS is used but the modeling methodology can be generalized for use in other tools as well. For the MEMS varactor which is investigated in this paper good agreement is obtained between simulated and measured data. The capacitance variation for different tuning voltages as well as the frequency and power dependency of the component are discussed. For a bias voltage range up to 130 V a capacitance tuning ratio of more than 5:1 is obtained. The excellent linearity provided by minimal self actuation effects qualify the component for use in high power applications.},
    author = {Lourandakis, Errikos and Fischer, Georg and Weigel, Robert},
    booktitle = {German Microwave Conference, 2009},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058957},
    year = {2009},
    month = {03},
    doi = {10.1109/GEMIC.2009.4815912},
    faupublication = {yes},
    keywords = {continuously tunable; mems; varactor; microelectromechanical},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Characterization and Modeling of Continuously Tunable MEMS Varactor},
    }
  • [DOI] E. Lourandakis, M. Schmidt, G. Fischer, and R. Weigel, "A Ferroelectric Tunable Combline Filter With Improved Stopband Transitions" in Radio and Wireless Symposium, 2009. RWS '09. IEEE, 2009, pp. 340-343. [Bibtex]
    @inproceedings{lourandakis2009a,
    abstract = {In this work the design of a microstrip line based frequency agile bandpass filter with improved selectivity is presented. The original combline bandpass performance is improved, by a transmission zero which is inserted in the lower stopband, resulting in steeper stopband transitions. The frequency agile behavior is obtained by using ferroelectric thin-film varactors as tuning elements at the resonator ends. The implemented prototype filter can be tuned continuously in the frequency region from 1.8 GHz to 2.1 GHz exhibiting a worst case insertion loss of less than 3 dB and passband return loss better than 20 dB at all operating bias states. Excellent agreement between simulation and measurement results is obtained for the proposed topology at all tuning states. An output referred 3 rd order intercept point of 36.5 dBm was measured by a two tone setup.},
    author = {Lourandakis, Errikos and Schmidt, Matthias and Fischer, Georg and Weigel, Robert},
    booktitle = {Radio and Wireless Symposium, 2009. RWS '09. IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058958},
    year = {2009},
    month = {01},
    doi = {10.1109/RWS.2009.4957349},
    faupublication = {yes},
    keywords = {Ferroelectric capacitors; bandpass filters; tunable filters},
    pages = {340--343},
    peerreviewed = {unknown},
    title = {A Ferroelectric Tunable Combline Filter With Improved Stopband Transitions},
    }
  • [DOI] B. Sewiolo, G. Fischer, and R. Weigel, "A 15GHz Bandwidth High Efficiency Power Distributed Amplifier for Ultra-Wideband-Applications Using a Low-Cost SiGe BiCMOS Technology" in IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, 2009, San Diego, USA, 2009, pp. 1-4. [Bibtex]
    @inproceedings{sewiolo2009b,
    abstract = {In this paper the analysis, design and characterization of a 15 GHz power distributed amplifier for ultra-wideband radar and sensing applications are presented. The amplifier is fabricated in a low-cost 0.25 mum SiGe BiCMOS technology with a transit frequency ft of 25 GHz. The circuit integrates four common-emitter gain cells, which are capacitively coupled to the base line for power optimization. Collector line tapering has been used for efficiency improvement. 13.5 dBm output power has been measured at the 1 dB compression point (P1dB) in the desired frequency range with an associated gain of 9.5 dB and a gain flatness of plusmn0.5 dB with total power consumption of 140 mW. The peak power added efficiency (PAE) at P1dB is 13.8%. The chip size of the compact amplifier is 1.45 mm2. Good agreement between simulation and measurement was achieved.},
    author = {Sewiolo, Benjamin and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, 2009},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058996},
    year = {2009},
    month = {01},
    doi = {10.1109/SMIC.2009.4770545},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 15GHz Bandwidth High Efficiency Power Distributed Amplifier for Ultra-Wideband-Applications Using a Low-Cost SiGe BiCMOS Technology},
    venue = {San Diego, USA},
    }
  • A. Samulak, G. Fischer, and R. Weigel, "Optimized Delta Sigma Modulation for Class-S Power Amplifiers Based on GaN Switching Transistors" in IEEE Radio Wireless Symposium, 2009, pp. 519-522. [Bibtex]
    @inproceedings{samulak2009,
    author = {Samulak, Andrzej and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE Radio Wireless Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058961},
    year = {2009},
    faupublication = {yes},
    isbn = {9781424426980},
    pages = {519--522},
    peerreviewed = {unknown},
    title = {Optimized Delta Sigma Modulation for Class-S Power Amplifiers Based on GaN Switching Transistors},
    }
  • [DOI] B. Sewiolo, G. Fischer, and R. Weigel, "A High-Linearity Tapered Distributed Amplifier for Ultra-Wideband-Applications" in German Microwave Conference, Munich, Germany, 2009. [Bibtex]
    @inproceedings{sewiolo2009a,
    author = {Sewiolo, Benjamin and Fischer, Georg and Weigel, Robert},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058997},
    year = {2009},
    doi = {10.1109/GEMIC.2009.4815853},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A High-Linearity Tapered Distributed Amplifier for Ultra-Wideband-Applications},
    venue = {Munich, Germany},
    }

2008

  • G. Fischer, "Partitioning of Electronic Systems into Analogue and Digital Part - Example of Class-S Basestation Amplifier" in Elektrotechnisches Kolloquium, University of Erlangen-Nuremberg, 2008. [Bibtex]
    @inproceedings{fischer2008c,
    author = {Fischer, Georg},
    booktitle = {Elektrotechnisches Kolloquium, University of Erlangen-Nuremberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058911},
    year = {2008},
    month = {08},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Partitioning of Electronic Systems into Analogue and Digital Part - Example of Class-S Basestation Amplifier},
    }
  • A. Samulak, G. Fischer, and R. Weigel, "Demonstrator of Class-S Power Amplifier" in GHz Symposium, Göteborg, Sveden, 2008. [Bibtex]
    @inproceedings{samulak2008,
    author = {Samulak, Andrzej and Fischer, Georg and Weigel, Robert},
    booktitle = {GHz Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058893},
    year = {2008},
    month = {03},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Demonstrator of Class-S Power Amplifier},
    venue = {Göteborg, Sveden},
    }
  • A. Samulak, G. Fischer, and R. Weigel, "Demonstrator of Class-S Power Amplifier based on GaN transistors" in German Microwave Conference - GeMIC, Technische Universität Hamburg-Harburg (TUHH), Germany, 2008. [Bibtex]
    @inproceedings{samulak2008a,
    author = {Samulak, Andrzej and Fischer, Georg and Weigel, Robert},
    booktitle = {German Microwave Conference - GeMIC},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058916},
    year = {2008},
    month = {03},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Demonstrator of Class-S Power Amplifier based on GaN transistors},
    venue = {Technische Universität Hamburg-Harburg (TUHH), Germany},
    }
  • G. Fischer, "Necessary Components and Subsystems for Efficient Frequency and Standards Agile Cognitive Radio Systems" in FP7 Consultation Meeting: Future Mobile and Wireless Radio Systems, 2008. [Bibtex]
    @inproceedings{fischer2008b,
    author = {Fischer, Georg},
    booktitle = {FP7 Consultation Meeting: Future Mobile and Wireless Radio Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058910},
    year = {2008},
    month = {02},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Necessary Components and Subsystems for Efficient Frequency and Standards Agile Cognitive Radio Systems},
    }
  • G. Fischer, "Future Challenges in R&D with respect to mobile communication basestations" in European Microwave Interest Group meeting at European Commission, Brussels, Belgium, 2008. [Bibtex]
    @inproceedings{fischer2008a,
    author = {Fischer, Georg},
    booktitle = {European Microwave Interest Group meeting at European Commission},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058913},
    year = {2008},
    month = {01},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Future Challenges in R&D with respect to mobile communication basestations},
    url = {ftp://ftp.cordis.europa.eu/pub/fp7/ict/docs/nanoelectronics/20080108-09-wireless-fischer_en.pdf},
    venue = {Brussels, Belgium},
    }
  • G. Fischer, "RF Systems for SDR Basestations with Wide Frequency Agility and Highly Energy Efficient" in Bell Labs Colloquium, 2008. [Bibtex]
    @inproceedings{fischer2008,
    author = {Fischer, Georg},
    booktitle = {Bell Labs Colloquium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058947},
    year = {2008},
    month = {01},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {RF Systems for SDR Basestations with Wide Frequency Agility and Highly Energy Efficient},
    }

2006

  • G. Fischer, "Reconfigurable and efficient GaN based power amplifiers for frequency agile RF Systems in mobile communication basestations" in IWPC workshop on reconfigurable radios for versatile basestations, Munich, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006j,
    author = {Fischer, Georg},
    booktitle = {IWPC workshop on reconfigurable radios for versatile basestations},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058210},
    year = {2006},
    month = {12},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Reconfigurable and efficient GaN based power amplifiers for frequency agile RF Systems in mobile communication basestations},
    venue = {Munich, Germany},
    }
  • G. Fischer, "GaN as an enabling technology for advanced amplifier architectures" in Elektrotechnisches Kolloqium, University of Ulm, Ulm, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006i,
    author = {Fischer, Georg},
    booktitle = {Elektrotechnisches Kolloqium, University of Ulm},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058212},
    year = {2006},
    month = {12},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {GaN as an enabling technology for advanced amplifier architectures},
    venue = {Ulm, Germany},
    }
  • G. Fischer, "RF-MEMS for basestations, talk and panel discussion "Will RF MEMS hold its promises?"" in Electronica Trade Fair, Munich, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006h,
    author = {Fischer, Georg},
    booktitle = {Electronica Trade Fair},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058211},
    year = {2006},
    month = {11},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {RF-MEMS for basestations, talk and panel discussion "Will RF MEMS hold its promises?"},
    venue = {Munich, Germany},
    }
  • G. Fischer, "RF-MEMS benefits for the RF system of wireless basestations" in Advanced MEMS for RF and Millimeter Wave Communications - European Networks, Leuven, Belgium, 2006. [Bibtex]
    @inproceedings{fischer2006g,
    author = {Fischer, Georg},
    booktitle = {Advanced MEMS for RF and Millimeter Wave Communications - European Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058214},
    year = {2006},
    month = {10},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {RF-MEMS benefits for the RF system of wireless basestations},
    venue = {Leuven, Belgium},
    }
  • [DOI] G. Fischer, H. Würfl, R. Behtash, l. Richard, A. Liero, W. Heinrich, G. Tränkle, and K. Hirche, "Advances in GaN-based discrete power devices for L- and X-band applications" in European Microwave Week, Manchester, 2006, pp. 1716-1718. [Bibtex]
    @inproceedings{fischer2006f,
    abstract = {Progress in fabrication of packaged discrete L- and X-band power AlGaN/GaN HFETs is presented. By exploiting typical GaN HFET related features such as improved linearity, power density, gain and broad band capability the devices allow for novel architectures for base stations in mobile communications and for space applications. Highlights to be presented are L-band power bar devices designed for continuous wave (cw) operation delivering an cw output power of 30 W and 100 W with 20 dB and 14 dB linear gain respectively. The architecture of these devices is based on novel gate "feed plate" structures. Furthermore discrete, hermetically packaged X-band devices for space based SSPAs in the power range of 10 W (continuous wave) at 8 GHz are presented.},
    author = {Fischer, Georg and Würfl, Hans-Joachim and Behtash, R. and Richard, l. and Liero, A. and Heinrich, Wolfgang and Tränkle, G. and Hirche, K.},
    publisher = {IEEE},
    booktitle = {European Microwave Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058213},
    year = {2006},
    month = {09},
    doi = {10.1109/EUMC.2006.281472},
    faupublication = {no},
    isbn = {9782960055160},
    keywords = {Gallium nitride; discrete; power bars; power amplifiers},
    number = {9407204},
    pages = {1716--1718},
    peerreviewed = {unknown},
    title = {Advances in GaN-based discrete power devices for L- and X-band applications},
    venue = {Manchester},
    }
  • G. Fischer, "Frequency agile RF systems - Software defined analogue front ends" in T-Mobile Technology Symposium on Multi Band and Multi Standard Implementation in Mobile Communication Systems, Bonn, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006e,
    author = {Fischer, Georg},
    booktitle = {T-Mobile Technology Symposium on Multi Band and Multi Standard Implementation in Mobile Communication Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058206},
    year = {2006},
    month = {05},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Frequency agile RF systems - Software defined analogue front ends},
    venue = {Bonn, Germany},
    }
  • G. Fischer, "Trends in Basestation RF Technology" in German Microwave Conference (GeMiC 2006), Karlsruhe, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006d,
    author = {Fischer, Georg},
    booktitle = {German Microwave Conference (GeMiC 2006)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058205},
    year = {2006},
    month = {03},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Trends in Basestation RF Technology},
    venue = {Karlsruhe, Germany},
    }
  • G. Fischer, "Technologies for the Evolution of the RF System with a Base Station" in Bell Labs Mini Summit, Murray Hill, United Kingdom, 2006. [Bibtex]
    @inproceedings{fischer2006,
    author = {Fischer, Georg},
    booktitle = {Bell Labs Mini Summit},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058245},
    year = {2006},
    month = {03},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Technologies for the Evolution of the RF System with a Base Station},
    venue = {Murray Hill, United Kingdom},
    }
  • G. Fischer, "Metamaterial Strukturen fuer den Einsatz in frequenzagilen Hochfrequenzsystemen" in Radar and Communication 2006, RADCOM 2006, Hamburg, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006a,
    author = {Fischer, Georg},
    booktitle = {Radar and Communication 2006, RADCOM 2006},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058209},
    year = {2006},
    month = {03},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Metamaterial Strukturen fuer den Einsatz in frequenzagilen Hochfrequenzsystemen},
    venue = {Hamburg, Germany},
    }
  • G. Fischer and W. Eckl, "Trends and Technologies for mobile communication systems" in Radar and Communication (RADCOM 2006), Hamburg, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006b,
    author = {Fischer, Georg and Eckl, Wolfgang},
    booktitle = {Radar and Communication (RADCOM 2006)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058207},
    year = {2006},
    month = {03},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Trends and Technologies for mobile communication systems},
    venue = {Hamburg, Germany},
    }
  • G. Fischer, "RF-MEMS as the bridge between digital control and high performance analog RF" in German Microwave Conference (GeMiC 2006) , Karlsruhe, Germany, 2006. [Bibtex]
    @inproceedings{fischer2006c,
    author = {Fischer, Georg},
    booktitle = {German Microwave Conference (GeMiC 2006) , Karlsruhe, Germany},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058208},
    year = {2006},
    month = {03},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {RF-MEMS as the bridge between digital control and high performance analog RF},
    }
  • G. Dehm-Andone, G. Adamiuk, and G. Fischer, "Using Metamaterial structures with frequency agile basestations" in German Microwave Conference (GeMiC 2006), Karlsruhe, Germany, 2006. [Bibtex]
    @inproceedings{dehm-andone2006,
    abstract = {http://duepublico.uni-duisburg-essen.de/servlets/DerivateServlet/Derivate-14694/Final_Papers/GM0112-F.pdf},
    author = {Dehm-Andone, Gunther and Adamiuk, Grzegorz and Fischer, Georg},
    booktitle = {German Microwave Conference (GeMiC 2006)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058184},
    year = {2006},
    month = {03},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Using Metamaterial structures with frequency agile basestations},
    venue = {Karlsruhe, Germany},
    }

2005

  • R. Quay, H. Würfl, D. Wiegner, and G. Fischer, "GaN/AlGaN HEMTs for Highly Linear Communication Applications in L-Frequency band" in GigaHertz Symposium, Uppsala, 2005. [Bibtex]
    @inproceedings{quay2005,
    author = {Quay, Rainer and Würfl, Hans-Joachim and Wiegner, D. and Fischer, Georg},
    publisher = {GigaHertz},
    booktitle = {GigaHertz Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058121},
    year = {2005},
    month = {11},
    faupublication = {no},
    keywords = {GaN; PA},
    peerreviewed = {unknown},
    title = {GaN/AlGaN HEMTs for Highly Linear Communication Applications in L-Frequency band},
    venue = {Uppsala},
    }
  • [DOI] G. Fischer, P. Gammel, and J. Bouchaud, "RF MEMS and NEMS technology, devices, and applications", Bell Labs Technical Journal, vol. 10, iss. 3, pp. 29-59, 2005. [Bibtex]
    @article{fischer2005c,
    abstract = {Will RF MEMS deliver on its promise to be one of the major MEMS businesses in the future? RF MEMS has now entered its second generation; high-volume production of both contacting and non-contacting switches and filters (based on bulk acoustic waves) was ramped up worldwide starting in 2003. In first-generation RF MEMS, discrete components were developed to demonstrate RF performance and reliability, and low-cost, high-volume chipand wafer-scale packaging eliminated the final barriers to high-volume production of discrete replacement components with MEMS. In this paper, we review the RF MEMS industry and the commercialization status of RF MEMS components. We also provide a detailed case study of mobile telephone basestations, demonstrating how RF MEMS can impact telecommunications. Finally, we look at research into third-generation RF MEMS and NEMS, in which integration, active devices, and new functionality will create opportunities for disruptive changes in RF subsystems, enabling such things as software-defined radio. © 2005 Lucent Technologies Inc.},
    author = {Fischer, Georg and Gammel, P. and Bouchaud, J.},
    publisher = {Lucent Technologies},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058154},
    year = {2005},
    month = {11},
    doi = {10.1002/BLTJ.20103},
    faupublication = {no},
    issn = {1089-7089},
    journaltitle = {Bell Labs Technical Journal},
    number = {3},
    pages = {29--59},
    peerreviewed = {Yes},
    shortjournal = {BELL LABS TECH J},
    title = {RF MEMS and NEMS technology, devices, and applications},
    volume = {10},
    }
  • G. Fischer and W. Eckl, "Trends and technologies for frequency agile communication systems" in Mikrowellen Workshop, Bayreuth, Germany, 2005. [Bibtex]
    @inproceedings{fischer2005b,
    author = {Fischer, Georg and Eckl, Wolfgang},
    booktitle = {Mikrowellen Workshop},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058152},
    year = {2005},
    month = {11},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Trends and technologies for frequency agile communication systems},
    venue = {Bayreuth, Germany},
    }
  • G. Fischer, "Leistungsverstärker mit Transistoren und ihre Linearisierung - Power amplifiers with transistors and their linearization" in CCG-Seminar SE2.02, Basics of Microwave Technology for Communications and Radar applications, Oberpfaffenhofen, 2005. [Bibtex]
    @inproceedings{fischer2005a,
    author = {Fischer, Georg},
    booktitle = {CCG-Seminar SE2.02, Basics of Microwave Technology for Communications and Radar applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058153},
    year = {2005},
    month = {09},
    faupublication = {no},
    keywords = {PA},
    peerreviewed = {unknown},
    title = {Leistungsverstärker mit Transistoren und ihre Linearisierung - Power amplifiers with transistors and their linearization},
    venue = {Oberpfaffenhofen},
    }
  • [DOI] G. Fischer, W. Wiesbeck, C. Waldschmidt, and F. Pivit, "Polarization Coupling Effects in a Dual-Polarized Aperture Antenna for Multiband Base Stations" in IEEE Antennas and Propagation Society International Symposium, Washington, USA, 2005, pp. 496-499. [Bibtex]
    @inproceedings{fischer2005,
    abstract = {The paper shows that the proposed antenna covers multiple mobile communication frequency bands, it shows the stable performance of the antenna within these frequency bands and states the capability of its polarization diversity feature.},
    author = {Fischer, Georg and Wiesbeck, Werner and Waldschmidt, Christian and Pivit, Florian},
    booktitle = {IEEE Antennas and Propagation Society International Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058174},
    year = {2005},
    month = {07},
    doi = {10.1109/APS.2005.1551854||10.1109/APS.2005.1551854},
    faupublication = {no},
    isbn = {9780780388833},
    pages = {496--499},
    peerreviewed = {unknown},
    title = {Polarization Coupling Effects in a Dual-Polarized Aperture Antenna for Multiband Base Stations},
    venue = {Washington, USA},
    volume = {2A},
    }
  • [DOI] R. Weigel, L. Maurer, G. Fischer, T. Müller, and P. Scheele, "Workshop WS3: frequency agile and software defined radio" in IEEE Radio and Wireless Conference, Atlanta, USA, 2005, p. 12. [Bibtex]
    @inproceedings{weigel2005,
    abstract = {Interest in reconfigurability with terminals, base stations and also whole wireless networks is significantly rising. Various research projects look at reconfigurability from an end to end perspective of a communication link. This implies that reconfigurability is reflected with the baseband signal processing part as well as with the RF part of a communication device. The workshop therefore addresses various aspects of reconfigurability with RF through offering frequency agility with the radio and with baseband processing through reconfigurable digital signal processing. Frequency agility is therefore understood as one aspect of a general view on software radio to realize multimode devices that are multistandard and multiband capable. A great challenge with reconfigurable devices is the optimization for the right balance between analog and digital signal processing and the way how imperfections of the hardware are compensated. The level of reconfigurability further depends on the tuneability of the used materials, the components and the architectural choices made. For cost efficient implementations of reconfigurable devices, integration techniques play a key role.},
    author = {Weigel, Robert and Maurer, Linus and Fischer, Georg and Müller, Thomas and Scheele, Patrick},
    booktitle = {IEEE Radio and Wireless Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058175},
    year = {2005},
    month = {02},
    doi = {10.1109/RAWCON.2004.1389047},
    faupublication = {no},
    isbn = {9780780384514},
    keywords = {frequency; software defined radio},
    pages = {12},
    peerreviewed = {unknown},
    title = {Workshop WS3: frequency agile and software defined radio},
    venue = {Atlanta, USA},
    volume = {1},
    }

2004

  • [DOI] G. Fischer, H. De Los Santos, H. Tilmans, and J. van Beek, "RF MEMS for ubiquitous wireless connectivity. Part II. Application", IEEE Microwave Magazine, vol. 5, iss. 4, pp. 50-65, 2004. [Bibtex]
    @article{fischer2004c,
    abstract = {This paper reports on RF-MEMS switchable capacitors, varactors, and ohmic switch technology attribute for both base stations and handsets in realizing frequency-agile RF/wireless systems capable of serving multiple frequency bands. For the handset, this leads to a smaller footprint combined with low power consumption of the RF radio. For the base station the benefit lies in ability for reconfiguration of the air interface, which leads to high logistical savings for infrastructure vendors through a reduction in the number of product variants. Reconfigurable frequency-agile radios are a perfect addition to reconfigurable baseband processing. Both together form the basis of a realistic and reasonable approach to realize software radios.},
    author = {Fischer, Georg and De Los Santos, Hector and Tilmans, Harrie and van Beek, Joost},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057887},
    year = {2004},
    month = {12},
    doi = {10.1109/MMW.2004.1380278(410) 5},
    faupublication = {no},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {4},
    pages = {50--65},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {RF MEMS for ubiquitous wireless connectivity. Part II. Application},
    volume = {5},
    }
  • [DOI] G. Fischer, H. De Los Santos, H. Tilmans, and J. van Beek, "RF MEMS for ubiquitous wireless connectivity. Part I. Fabrication", IEEE Microwave Magazine, vol. 5, iss. 4, pp. 36-49, 2004. [Bibtex]
    @article{fischer2004b,
    abstract = {The aim of this article to expose the impact and status of the application of RF-MEMS switchable capacitors, varactors and switches in the three elements of this paradigm, namely, handsets, base stations, and satellites. In particular, issues such as system-level motivation/justification for RF MEMS, device requirements, high-volume manufacturing, packaging, and state-of-the-art performance and reliability, are presented.},
    author = {Fischer, Georg and De Los Santos, Hector and Tilmans, Harrie and van Beek, Joost},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057888},
    year = {2004},
    month = {12},
    doi = {10.1109/MMW.2004.1380277(410) 5},
    faupublication = {no},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {4},
    pages = {36--49},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {RF MEMS for ubiquitous wireless connectivity. Part I. Fabrication},
    volume = {5},
    }
  • G. Fischer, "Frequency agile basestation systems" in Radio Techniques and Technologies for Commercial Communication and Sensing Applications, Berlin, Germany, 2004. [Bibtex]
    @inproceedings{fischer2004a,
    author = {Fischer, Georg},
    booktitle = {Radio Techniques and Technologies for Commercial Communication and Sensing Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057889},
    year = {2004},
    month = {10},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Frequency agile basestation systems},
    venue = {Berlin, Germany},
    }
  • G. Fischer, "Architectural benefits of wide bandgap RF power transistos for frequency agile basestation systems" in Annual Wireless and Microwave Technology Conference, Clearwater Beach, USA, 2004. [Bibtex]
    @inproceedings{fischer2004,
    abstract = {The variety of standard - frequency band combinations with mobile communication systems is increasing. This has led to the request for software radio basestations that offer Multiband and Multistandard capability. Multiband capability is offered through frequency agile basestation systems that can be reconfigured to operate at different frequency bands and different standards, thus providing a flexible air interface. This paper focuses on how specific characteristics of wide band gap RF power transistors at device level map to benefits at architectural level with those frequency agile systems.},
    author = {Fischer, Georg},
    booktitle = {Annual Wireless and Microwave Technology Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057910},
    year = {2004},
    month = {04},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Architectural benefits of wide bandgap RF power transistos for frequency agile basestation systems},
    venue = {Clearwater Beach, USA},
    }

2003

  • G. Fischer, "Concept on Frequency Agile Basestation System, Supporting Technologies and System Analysis" in Electrotechnical Colloquium, Erlangen, Germany, 2003. [Bibtex]
    @inproceedings{fischer2003a,
    author = {Fischer, Georg},
    booktitle = {Electrotechnical Colloquium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057865},
    year = {2003},
    month = {12},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Concept on Frequency Agile Basestation System, Supporting Technologies and System Analysis},
    venue = {Erlangen, Germany},
    }
  • B. Friedel, W. Eckl, and G. Fischer, "Comparison of different Semiconductor Technologies for RF Power Transistors for use within Basestation Amplifiers" in Workshop on RF and baseband Architectures for future reconfigurable Multiband/Multistandard Basestations and Terminals, Munich, Germany, 2003. [Bibtex]
    @inproceedings{friedel2003,
    author = {Friedel, Bernd and Eckl, Wolfgang and Fischer, Georg},
    booktitle = {Workshop on RF and baseband Architectures for future reconfigurable Multiband/Multistandard Basestations and Terminals},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057867},
    year = {2003},
    month = {10},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {Comparison of different Semiconductor Technologies for RF Power Transistors for use within Basestation Amplifiers},
    venue = {Munich, Germany},
    }
  • G. Fischer, "RF MEMS Applications for Wireless Communication Systems" in MEMS-Seminar im DFG-Graduiertenkolleg "Mischfelder und nichtlineare Wechselwirkungen", Karlsruhe, Germany, 2003. [Bibtex]
    @inproceedings{fischer2003,
    abstract = {As with communication systems spectrum is the most scare resource, there is great demand for flexible radios that can adapt to different frequency bands of operation to accommodate regulatory changes or facilitate new methods for spectrum pooling. The classical answer to this demand has been the software radio approach based on wideband sampling techniques. In the talk an alternative solution to provide flexibility with respect to frequency band of operation and channel bandwidth is given that is based on RF-MEMS. For this approach a new terminology is settling in literature which is the "frequency agile radio" or more precisely the "frequency agile frontend". It shows up that RF-MEMS is a very attractive technology to provide the requested flexibility through reconfiguring the properties of the RF chain. A comparison between the classical approach of providing flexibility solely through alterations in the digital domain after wideband sampling versus the new approach of altering the characteristics of the RF chain prior to narrowband sampling is provided. The pros and cons will be listed and weighted. Some examples for the use of RF-MEMS for flexibility in the analog RF domain will be given: - Reconfigurable basestations - Wireless microphone systems - Terminals (mobile phones/data cards), interfacing between power amplifier and integrated antenna - Adaptive matching with reconfigurable Multiband Power amplifiers The talk will highlight that tuning elements offered through RF-MEMS devices like Switches, Varactors (variable C) and Variometers (variable L) will allow for new radio architectures that allow for great flexibility at low cost. Packaging and integration issues will also be addressed from the system perspective.},
    author = {Fischer, Georg},
    booktitle = {MEMS-Seminar im DFG-Graduiertenkolleg "Mischfelder und nichtlineare Wechselwirkungen"},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057866},
    year = {2003},
    month = {10},
    faupublication = {no},
    peerreviewed = {unknown},
    title = {RF MEMS Applications for Wireless Communication Systems},
    venue = {Karlsruhe, Germany},
    }

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