Research

Most recent projetcs

All Projects…

Most recent awards

  • N. Duda, Reisekostenvollstipendium für FAU Shenzhen Fall School, Digital Tech Academy Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019. [Bibtex]
    @prize{duda_prize_2019,
    author = {Duda, Niklas},
    booktitle = {Digital Tech Academy Friedrich-Alexander-Universität Erlangen-Nürnberg},
    cris = {duda_prize_2019},
    year = {2019},
    month = {07},
    day = {19},
    title = {Reisekostenvollstipendium für FAU Shenzhen Fall School},
    type = {20773-Kleiner Preis},
    }
  • T. Ackermann, J. Potschka, and T. Maiwald, IEEE MTT-S International Microwave Symposium Student Design Competition First Place Award for "Power Amplifier Linearization through Digital Predistortion (DPD)", IEEE Microwave Theory and Techniques Society (MTT-S), 2019. [Bibtex]
    @prize{ackermann_prize_2019,
    abstract = {In the area of mobile communications, Thomas Ackermann and Julian Potschka and Tim Maiwald won the Power Amplifier Linearization through Digital Pre-Distortion (DPD) competition against two other opponents. The goal of the challenge was to design an algorithm for pre-distorting a 2-channel MIMO transmitter with cross-coupling effect in order to maximize the linearity of the overall system. The system consisted of two GaN HEMT Doherty power amplifiers and a coupler to control the crosstalk between the two PAs. The team implemented a cascaded polynomial model that reduced unwanted static and dynamic effects as well as crosstalk between the two PAs, optimizing the overall performance of the system.
    }, author = {Ackermann, Thomas and Potschka, Julian and Maiwald, Tim}, booktitle = {IEEE Microwave Theory and Techniques Society (MTT-S)}, cris = {ackermann_prize_2019}, year = {2019}, month = {06}, day = {06}, title = {IEEE MTT-S International Microwave Symposium Student Design Competition First Place Award for "Power Amplifier Linearization through Digital Predistortion (DPD)"}, type = {20773-Kleiner Preis}, }
  • J. Potschka, IMS PhD Student Sponsorship, IEEE Microwave Theory and Techniques Society, 2019. [Bibtex]
    @prize{potschka_prize_2019,
    author = {Potschka, Julian},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {potschka_prize_2019},
    year = {2019},
    month = {06},
    day = {07},
    title = {IMS PhD Student Sponsorship},
    type = {20773-Kleiner Preis},
    }
  • B. Scheiner and F. Michler, IEEE MTT-S International Microwave Symposium Student Design Competition First Place Award for "High-Sensitivity Motion Sensing Radar", IEEE Microwave Theory and Techniques Society (MTT-S), 2019. [Bibtex]
    @prize{scheiner_prize_2019a,
    author = {Scheiner, Benedict and Michler, Fabian},
    booktitle = {IEEE Microwave Theory and Techniques Society (MTT-S)},
    cris = {scheiner_prize_2019a},
    year = {2019},
    month = {06},
    day = {06},
    title = {IEEE MTT-S International Microwave Symposium Student Design Competition First Place Award for "High-Sensitivity Motion Sensing Radar"},
    type = {20773-Kleiner Preis},
    }
  • A. Ali and G. Fischer, IEEE Best Student Paper Award (1st Place) for "Symbol Based Statistical RF Fingerprinting for Fake Base Station Identification", IEEE Czechoslovakia Section at MAREW, 2019. [Bibtex]
    @prize{ali_prize_2019a,
    author = {Ali, Arslan and Fischer, Georg},
    booktitle = {IEEE Czechoslovakia Section at MAREW},
    cris = {ali_prize_2019a},
    year = {2019},
    month = {04},
    day = {18},
    title = {IEEE Best Student Paper Award (1st Place) for "Symbol Based Statistical RF Fingerprinting for Fake Base Station Identification"},
    type = {20773-Kleiner Preis},
    }

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All Awards...

Most recent publications

  • R. Ciocoveanu, R. Weigel, A. Hagelauer, and V. Issakov, "A 20.7% PAE 3-Stage 60 GHz Power Amplifier for Radar Applications in 28 nm Bulk CMOS" in European Microwave Week, Paris, France, 2019. [Bibtex]
    @inproceedings{ciocoveanu2019a,
    abstract = {This paper presents a highly efficient 3-stage differential Class-B power amplifier (PA) for short range radar applications, realized in a 28nm bulk CMOS technology. Measurement results show a saturated output power (Psat) of 11.9dBm with a 20.7% power-added efficiency (PAE) at 60 GHz. Moreover, the measurements show that for a frequency range from 57 GHz to 64 GHz, the Psat varies from 10.5dBm to 11.2dBm and the circuit draws 26mA from a 0.9V power supply. Furthermore, the fabricated chip has an area of 0.61mm x 0.31mm including the pads.
    }, author = {Ciocoveanu, Radu and Weigel, Robert and Hagelauer, Amelie and Issakov, Vadim}, language = {English}, booktitle = {European Microwave Week}, cris = {https://cris.fau.de/converis/publicweb/publication/220911836}, year = {2019}, month = {12}, day = {29}, eventdate = {2019-09-29/2019-10-04}, faupublication = {yes}, keywords = {Differential PA,60 GHz,28nm CMOS,High Efficiency.}, peerreviewed = {unknown}, title = {A 20.7% PAE 3-Stage 60 GHz Power Amplifier for Radar Applications in 28 nm Bulk CMOS}, type = {Konferenzschrift}, venue = {Paris, France}, }
  • B. Scheiner, F. Lurz, F. Michler, R. Weigel, and A. Koelpin, "In-Situ-Linearization for Instantaneous Frequency Measurement Systems" in European Microwave Week 2019, Paris, France, 2019. [Bibtex]
    @inproceedings{scheiner2019b,
    author = {Scheiner, Benedict and Lurz, Fabian and Michler, Fabian and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {European Microwave Week 2019},
    cris = {https://cris.fau.de/converis/publicweb/publication/212606436},
    year = {2019},
    month = {10},
    day = {02},
    eventdate = {2019-09-30/2019-10-03},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {In-Situ-Linearization for Instantaneous Frequency Measurement Systems},
    type = {Konferenzschrift},
    venue = {Paris, France},
    }
  • M. Völkel, M. Dietz, A. Hagelauer, E. M. Hussein, D. Kissinger, and R. Weigel, "A Digital Adjustable Fully Integrated Bistatic Interferometric Radar Transceiver at 60 GHz in a 130 nm BiCMOS Technology" in EUMW, Paris, France, 2019 (to be published). [Bibtex]
    @inproceedings{voelkel2019c,
    abstract = {In this paper a 60 GHz monolithic bistatic interferometric
    radar transceiver for high precision measuring is
    presented. The integrated transceiver has been designed using
    a 0.13μm SiGe BiCMOS process from IHP (SG13G2) and
    includes a LNA, a passive six-port structure, detectors, multiplier,
    multiplexer, power amplifier and a digital interface. The chip has
    a size of 2330μm x 1360μm and a maximum power consumption
    of 533mW from a 3.3V power supply. The circuit provides two
    frequency inputs of 7.5 and 15GHz and multiplies them up to
    60 GHz at a minimum input power of -20 dBm. The chip delivers
    a maximum output power of 9dBm at 61 GHz. The input path
    is selectable and the output power is adjustable by a digital
    interface between -23 and 9dBm at 60 GHz. Also the reference
    input power of the six-port and the RF input power can be
    adjusted in a range of 13.2 dB. The minimum input referred
    P1dB is -24.1 dBm. With a multiplexer, the receiver reference can
    be separated from the transmitter, which allows the use of both
    independently from each other. The serial interface is realized
    in 0.13μm CMOS logic and consists of a 20 bit shift register,
    decoder and an analog interface.
    }, author = {Völkel, Matthias and Dietz, Marco and Hagelauer, Amelie and Hussein, E. M. and Kissinger, Dietmar and Weigel, Robert}, language = {English}, booktitle = {EUMW}, cris = {https://cris.fau.de/converis/publicweb/publication/216063791}, year = {2019}, month = {10}, day = {01}, eventdate = {2019-09-29/2019-10-04}, faupublication = {yes}, keywords = {bistatic radar; digital adjustable; industrial radar; integrated transceiver; interferometric radar; millimeter wave circuits; SiGe BiCMOS; six-port}, note = {unpublished}, peerreviewed = {unknown}, title = {A Digital Adjustable Fully Integrated Bistatic Interferometric Radar Transceiver at 60 GHz in a 130 nm BiCMOS Technology}, type = {Konferenzschrift}, venue = {Paris, France}, }
  • D. Ahmed, J. Kirchner, and G. Fischer, "Signal Transmission with Intra-body and Inter-body Communications (Simulation-based Models)" in 13th EAI International Conference on Body Area Networks (BODYNETS 2018), Oulu, Finland, 2019. [Bibtex]
    @inproceedings{ahmed2018,
    abstract = {In this paper, we investigate two types of data transmission in human body communication (HBC) with galvanic coupling: Intra-body communication along a human arm and inter-body communication between
    two arms in touch. For the former, the effect of bending the arm is investigated, too. The arms were modeled
    as five-layers concentric cylinders of different types of tissue. For simulation, the finite element method (FEM) COMSOL Multiphysics5.3a software was used. The influence of different HBC key parameters including applied frequency, distance between transmitter (TX) and receiver (RX), bending, contact area between the contiguous models, and induced current were investigated. The results show that the transmission loss increases with the increase of the transmission length and operating frequency. The electrical potential is directly proportional to the induced current. Bending helps to improve the detected signal in the cases of short distance between TX and RX around the curvature. For distant transceivers, both straight and bended models tend to behave in a close manner. However, no joints are added to the model. The signal degradation in inter-body communication is considerably higher compared to intra-body communication at the same horizontal distance between TX and RX. At frequencies above 200 kHz, both inter-body and intra-body communication give close values when the contact area between the arms covers the distance between TX and RX electrodes. In addition, by increasing the contact area and avoiding gaps between the models, the detected signal is improved. The results illustrate the main determinants of information transmission between both sensors within a body-sensors-network and between different person.
    }, author = {Ahmed, Doaa and Kirchner, Jens and Fischer, Georg}, language = {English}, booktitle = {13th EAI International Conference on Body Area Networks (BODYNETS 2018)}, cris = {https://cris.fau.de/converis/publicweb/publication/203249033}, year = {2019}, month = {10}, day = {02}, eventdate = {2018-10-02/2018-10-03}, faupublication = {yes}, keywords = {Cole-Cole expressions; dielectric properties; human tissue; finite element model; galvanic coupling; human body communication; inter-body communication; intra-body communication}, peerreviewed = {Yes}, title = {Signal Transmission with Intra-body and Inter-body Communications (Simulation-based Models)}, type = {Konferenzschrift}, venue = {Oulu, Finland}, }
  • T. Reißland, M. Kuba, J. Robert, A. Koelpin, R. Weigel, and F. Lurz, "Synchronization Approaches and Improvements for a Low-Complexity Power Line Communication Algorithm" in 2019 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, Peking, United Arab Emirates, 2019 (to be published). [Bibtex]
    @inproceedings{reissland2019b,
    abstract = {This paper presents several improvements of the energy-eattern based sequence detection (EPSD) algorithm for FSK-based single-phase power line communication (PLC) systems, in terms of complexity, reliability and synchronization. A time synchronization is presented which fulfills the well known task of synchronizing transmitter and receiver, but also helps to avoid transmissions in periods of rough noise conditions. The synchronization method is based on a maximum-likelihood approach that makes use of the phase of the mains voltage. Further improvements concern the codes used for the transmitted sequences as well as the combination of the information within both FSK carrier-frequencies in terms of equal gain and maximum ratio combining. Additionally an approach for a lowcomplexity frame synchronization is presented.
    }, author = {Reißland, Torsten and Kuba, Matthias and Robert, Jörg and Koelpin, Alexander and Weigel, Robert and Lurz, Fabian}, language = {English}, booktitle = {2019 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids}, cris = {https://cris.fau.de/converis/publicweb/publication/200235171}, year = {2019}, month = {10}, day = {21}, eventdate = {2019-10-21/2019-10-24}, faupublication = {yes}, note = {unpublished}, peerreviewed = {unknown}, title = {Synchronization Approaches and Improvements for a Low-Complexity Power Line Communication Algorithm}, type = {Konferenzschrift}, venue = {Peking, United Arab Emirates}, }
  • J. Jakob, R. Sammer, F. X. Röhrl, S. Zorn, and W. Bogner, "WR12 to planar transmission line transition on organic substrate" in Proceedings of the European Microwave Conference 2019, Paris, France, 2019, p. 4. [Bibtex]
    @inproceedings{jakob2019,
    abstract = {Transitions for planar transmission lines on printed circuit boards (PCB) to rectangular waveguide are challenging to design and manufacture. This paper introduces two transitions, the first one is a broadband transition from WR12 (60–90 GHz) waveguide to a stripline (SL) and the second is a narrowband transition to a grounded coplanar waveguide (GCPW). The focus at the first transition is based on the fact that signals can be transmitted in the complete EBand. In the process, many manufacturing possibilities were exploited. For the second transition, the focus was on manufacturability in order to achieve the most cost effective transition possible. Design, simulated and measured results will be presented.
    }, author = {Jakob, Johannes and Sammer, Roman and Röhrl, Franz Xaver and Zorn, Stefan and Bogner, Werner}, language = {English}, booktitle = {Proceedings of the European Microwave Conference 2019}, cris = {https://cris.fau.de/converis/publicweb/publication/216230917}, year = {2019}, month = {10}, day = {04}, eventdate = {2019-09-29/2019-10-04}, eventtitle = {European Microwave Conference}, faupublication = {yes}, keywords = {waveguide,PCB,transition,planar transmission line,grounded coplanar,stripline,WR12,GCPW}, pages = {4}, peerreviewed = {Yes}, title = {WR12 to planar transmission line transition on organic substrate}, type = {Konferenzschrift}, venue = {Paris, France}, }
  • S. Pfeiffer, S. Meyer, O. Amft, D. Anzai, J. Wang, G. Fischer, and J. Kirchner, "Motion-Induced Imbalance of Contact Impedance in ECG Capture: Comparison of Electrode Materials in Capacitive Coupling" in IEEE SENSORS 2019, Montréal, 2019 (to be published). [Bibtex]
    @inproceedings{pfeiffer2019,
    abstract = {Differences in contact impedance of the ECG measurement electrodes lead to asymmetries of the signal paths and thus result in reduced common-mode rejection and artifacts. Here, the imbalance of contact impedance is investigated for different types of electrodes with capacitive coupling in terms of static imbalance as well as dynamic variation during body movement. Flexible and incompressible materials like conductive foam and fabric showed the best overall performance. The negative effect of rigidity can partly be compensated by adding conducting foam, while soft materials can profit from an increase of electrode area.  
    }, author = {Pfeiffer, Sebastian and Meyer, Sebastian and Amft, Oliver and Anzai, Daisuke and Wang, Jianqing and Fischer, Georg and Kirchner, Jens}, language = {English}, booktitle = {IEEE SENSORS 2019}, cris = {https://cris.fau.de/converis/publicweb/publication/222439487}, year = {2019}, month = {10}, day = {27}, eventdate = {2019-10-27/2019-10-30}, faupublication = {yes}, note = {unpublished}, peerreviewed = {automatic}, title = {Motion-Induced Imbalance of Contact Impedance in ECG Capture: Comparison of Electrode Materials in Capacitive Coupling}, venue = {Montréal}, }
  • S. Erhardt, T. Kurin, F. Lurz, R. Weigel, and A. Koelpin, "An Open-Source Speech Codec at 450 bit/s with Pseudo-Wideband Mode" in European Microwave Conference 2019, Paris, France, 2019 (to be published). [Bibtex]
    @inproceedings{erhardt2019a,
    author = {Erhardt, Stefan and Kurin, Thomas and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Microwave Conference 2019},
    cris = {https://cris.fau.de/converis/publicweb/publication/216077309},
    year = {2019},
    month = {10},
    day = {29},
    eventdate = {2019-09-29/2019-10-04},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {An Open-Source Speech Codec at 450 bit/s with Pseudo-Wideband Mode},
    type = {Konferenzschrift},
    venue = {Paris, France},
    }
  • M. Bartunik, M. Lübke, H. Unterweger, C. Alexiou, S. Meyer, D. Ahmed, G. Fischer, W. Wicke, V. Jamali Kooshkghazi, R. Schober, and J. Kirchner, "Novel Receiver for Superparamagnetic Iron Oxide Nanoparticles in a Molecular Communication Setting" in ACM NanoCom 2019, Dublin, Ireland, 2019 (to be published). [Bibtex]
    @inproceedings{bartunik2020,
    abstract = {Superparamagnetic iron oxide nanoparticles (SPIONs) have recently been introduced as information carriers in a testbed for molecular communication (MC) in duct flow. Here, a new receiver for this testbed is presented, based on the concept of a Wheatstone bridge. The capability for a reliable transmission using the testbed and detection of the proposed receiver was evaluated by sending a text message and a 80 bit random sequence at a bit rate of 1/s, which resulted in a bit error rate of 0 %. Furthermore, the sensitivity of the device was assessed by a dilution series, which gave a limit of detectability of peaks between 0:1 to 0:5 mg/mL. Compared to the commercial susceptometer that was previously used as receiver, the new detector provides an increased sampling rate of 100 samples/s and flexibility in the dimensions of the propagation channel. Furthermore, it allows to implement both single-ended and differential signaling in SPION-bases MC testbeds  
    }, author = {Bartunik, Max and Lübke, Maximilian and Unterweger, Harald and Alexiou, Christoph and Meyer, Sebastian and Ahmed, Doaa and Fischer, Georg and Wicke, Wayan and Jamali Kooshkghazi, Vahid and Schober, Robert and Kirchner, Jens}, language = {English}, booktitle = {ACM NanoCom 2019}, cris = {https://cris.fau.de/converis/publicweb/publication/222425642}, year = {2019}, month = {09}, day = {25}, eventdate = {2019-09-25/2019-09-27}, faupublication = {yes}, keywords = {Molecular communication; superparamagnetic iron oxide nanoparticles; SPION; differtial signaling; receiver}, note = {unpublished}, peerreviewed = {unknown}, title = {Novel Receiver for Superparamagnetic Iron Oxide Nanoparticles in a Molecular Communication Setting}, type = {Konferenzschrift}, venue = {Dublin, Ireland}, }
  • M. Stephan, K. Wang, T. Reißland, R. Weigel, K. Wu, and F. Lurz, "Evaluation of Antenna Calibration and DOA Estimation Algorithms for FMCW Radars" in European Microwave Week, Paris, 2019 (to be published). [Bibtex]
    @inproceedings{stephan2019,
    author = {Stephan, Michael and Wang, Kuangda and Reißland, Torsten and Weigel, Robert and Wu, Ke and Lurz, Fabian},
    booktitle = {European Microwave Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/210965714},
    year = {2019},
    month = {09},
    day = {29},
    eventdate = {2019-09-29/2019-10-04},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {automatic},
    title = {Evaluation of Antenna Calibration and DOA Estimation Algorithms for FMCW Radars},
    venue = {Paris},
    }
  • K. Shi, S. Schellenberger, L. Weber, P. Wiedemann, F. Michler, T. Steigleder, A. Malessa, F. Lurz, C. Ostgathe, R. Weigel, and A. Koelpin, "Segmentation of Radar-Recorded Heart Sound Signals Using Bidirectional LSTM Networks" in 41st IEEE International Engineering in Medicine and Biology Conference, Berlin, Germany, 2019 (to be published). [Bibtex]
    @inproceedings{shi2019,
    abstract = {Sounds caused by the action of the heart reflect both its health as well as deficiencies and are examined by physicians since antiquity. Pathologies of the valves, e.g. insufficiencies and stenosis, cardiac effusion, arrhythmia, inflammation of the surrounding tissue and other diagnosis can be reached by experienced physicians. However, practice is needed to assess the findings correctly. Furthermore, stethoscopes do not allow for long-term monitoring of a patient. Recently, radar technology has shown the ability to perform continuous touchless and thereby burden-free heart sound measurements. In order to perform automated classification of the signals, the first and most important step is to segment the heart sounds into their physiological phases. This paper examines the use of different Long Short-Term Memory (LSTM) architectures for this purpose based on a large dataset of radar-recorded heart sounds gathered from 30 different test persons in a clinical study. The best-performing network, a bidirectional LSTM, achieves a sample-wise accuracy of 93.4% and a F1 score for the first heart sound of 95.8%.
    }, author = {Shi, Kilin and Schellenberger, Sven and Weber, Leon and Wiedemann, Philipp and Michler, Fabian and Steigleder, Tobias and Malessa, Anke and Lurz, Fabian and Ostgathe, Christoph and Weigel, Robert and Koelpin, Alexander}, language = {English}, booktitle = {41st IEEE International Engineering in Medicine and Biology Conference}, cris = {https://cris.fau.de/converis/publicweb/publication/215822199}, year = {2019}, month = {09}, day = {23}, eventdate = {2019-07-23/2019-07-27}, faupublication = {yes}, note = {unpublished}, peerreviewed = {Yes}, title = {Segmentation of Radar-Recorded Heart Sound Signals Using Bidirectional LSTM Networks}, type = {Konferenzschrift}, venue = {Berlin, Germany}, }
  • T. Ehlenz, P. Lenz, G. Fischer, and A. Wittmann, "Auf dem Weg zum intelligenten Kabel", ETZ, Elektrotechnik und Automation, pp. 62-65, 2019. [Bibtex]
    @article{ehlenz2019,
    abstract = {Gegenstände unserer Umwelt werden zunehmend „intelligent“ und koordinieren sich untereinander. Fabrikationsanlagen sagen vorher, wann sie ausfallen. Autos optimieren gemeinsam den Verkehrsfluss. Smartphones überwachen die Gesundheit ihrer Besitzer. Für die teilweise kritischen Verbindungen, die durch Strom- oder Datenleitungen realisiert werden, gilt dies bis dato noch nicht. Die forensischen Betrachtungen von Kabeln und Leitungen im Kabellabor der Hochschule Trier ermöglichen es, dass dies nun auch für Leitungen in greifbare Nähe rückt.


    }, author = {Ehlenz, Tobias and Lenz, Philipp and Fischer, Georg and Wittmann, Armin}, cris = {https://cris.fau.de/converis/publicweb/publication/224658852}, year = {2019}, month = {08}, faupublication = {yes}, issn = {0948-7387}, journaltitle = {ETZ, Elektrotechnik und Automation}, pages = {62--65}, peerreviewed = {unknown}, title = {Auf dem Weg zum intelligenten Kabel}, }

  • M. Völkel, M. Thouabtia, S. Breun, K. Aufinger, R. Weigel, and A. Hagelauer, "A Signal Source Chip at 140 GHz and 160 GHz for Radar Applications in a SiGe Bipolar Technology" in MWSCAS, Dallas, USA, 2019. [Bibtex]
    @inproceedings{voelkel2019d,
    abstract = {In this paper, a monolithic signal source chip at
    140 GHz and 160 GHz including two VCOs, a dynamic divider
    and a static divider chain is presented. Two signal sources with
    these high fundamental frequencies are realized. All components
    have been designed using a 0.13μm 250 GHz fT SiGe BiCMOS
    technology. The whole integrated circuit has a size of 930μm
    x 600μm including bondpads and consumes 210mA from a
    3.3V and 130mA from a 1.8V supply. The oscillators cover
    a frequency range from 119.3–147.7 GHz and 154.2–164 GHz,
    which results in a tuning range of 28.4 GHz and 9.8 GHz. A
    output power of -0.9/3.6dBm with a best case phase noise of
    -111.2/-108 dBc/Hz at 1MHz offset, measured at the divider
    output for PLL stabilization is achieved.
    }, author = {Völkel, Matthias and Thouabtia, Mohamed and Breun, Sascha and Aufinger, Klaus and Weigel, Robert and Hagelauer, Amelie}, language = {English}, booktitle = {MWSCAS}, cris = {https://cris.fau.de/converis/publicweb/publication/217336772}, year = {2019}, month = {08}, day = {05}, eventdate = {2019-08-04/2019-08-07}, faupublication = {yes}, keywords = {FMCW; industrial radar; millimeter-wave; oscillator; signal source; VCO.}, peerreviewed = {unknown}, title = {A Signal Source Chip at 140 GHz and 160 GHz for Radar Applications in a SiGe Bipolar Technology}, type = {Konferenzschrift}, venue = {Dallas, USA}, }
  • R. Ciocoveanu, R. Weigel, and A. Hagelauer, "Modified Gilbert-Cell Mixer with an LO Waveform Shaper and Switched Gate-Biasing for 1/f Noise Reduction in 28 nm CMOS", IEEE Transactions on Circuits and Systems Ii-Express Briefs, 2019. [Bibtex]
    @article{ciocoveanu2019b,
    author = {Ciocoveanu, Radu and Weigel, Robert and Hagelauer, Amelie},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/221117898},
    year = {2019},
    month = {08},
    faupublication = {yes},
    issn = {1549-7747},
    journaltitle = {IEEE Transactions on Circuits and Systems Ii-Express Briefs},
    peerreviewed = {Yes},
    shortjournal = {IEEE T CIRCUITS-II},
    title = {Modified Gilbert-Cell Mixer with an LO Waveform Shaper and Switched Gate-Biasing for 1/f Noise Reduction in 28 nm CMOS},
    }
  • M. Trautmann, B. Sanftl, R. Weigel, and A. Koelpin, "Simultaneous Inductive Power and Data Transmission System for Smart Applications", Ieee Circuits and Systems Magazine, vol. 19, iss. 3, pp. 23-33, 2019. [DOI] [Bibtex]
    @article{trautmann2018,
    abstract = {Inductive power transfer (IPT) development is a big issue amongst the scientific community but there are only few solutions for communication between the primary and secondary side. This article presents a completely contactless near field system, which can provide power and data simultaneously using one common inductive power link. In this novel approach both transmission channels are designed collaboratively to maximise their performance. Based on these joint system specifications, the requirements for each system are derived, analysed, simulated and measured. From this measurement the performance of the system is classified. To verify the joint specifications, the mutual interferences are evaluated and the system is compared to the state of the art. As a result, a prototype, which can provide 20W of power with a simultaneous data transfer of 461 kbit/s, is presented. With tested bit error rates smaller than 10-6, this communication link is a fully classified robust and reliable data link for IPT applications.},
    author = {Trautmann, Martin and Sanftl, Benedikt and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/123293544},
    year = {2019},
    month = {08},
    day = {13},
    doi = {10.1109/MCAS.2019.2924508},
    faupublication = {yes},
    issn = {1531-636X},
    journaltitle = {Ieee Circuits and Systems Magazine},
    number = {3},
    pages = {23--33},
    peerreviewed = {Yes},
    shortjournal = {IEEE CIRC SYST MAG},
    title = {Simultaneous Inductive Power and Data Transmission System for Smart Applications},
    type = {Review article},
    volume = {19},
    }
  • K. Shi, S. Schellenberger, F. Michler, T. Steigleder, A. Malessa, F. Lurz, C. Ostgathe, R. Weigel, and A. Koelpin, "Automatic Signal Quality Index Determination of Radar-Recorded Heart Sound Signals Using Ensemble Classification", IEEE Transactions on Biomedical Engineering, 2019. [Bibtex]
    @article{shi2019a,
    abstract = {Objective: Radar technology promises to be a
    touchless and thereby burden-free method for continuous
    heart sound monitoring which can be used to detect cardiovascular
    diseases. However, the first and most crucial step
    is to differentiate between high- and low-quality segments
    in a recording to assess their suitability for a subsequent
    automated analysis. This paper gives a comprehensive
    study on this task and firstly addresses the specific characteristics
    of radar-recorded heart sound signals. Methods:
    To gather heart sound signals recorded from radar, a
    bistatic radar system was built and installed at the university
    hospital. Under medical supervision, heart sound data
    were recorded from 30 healthy test subjects. The signals
    were segmented and labeled as high- or low-quality by a medical expert. Different state-of-the-art pattern classification
    algorithms were evaluated for the task of automated
    signal quality determination and the most promising one
    was optimized and evaluated using leave-one-subject-out cross-validation. Results: The proposed classifier is able to
    achieve an accuracy of up to 96.36% and demonstrates a
    superior classification performance compared to the stateof-
    the-art classifier with a maximum accuracy of 76.00 %.
    Conclusion: This paper introduces an ensemble classifier
    that is able to perform automated signal quality determination
    of radar-recorded heart sound signals with a
    high accuracy. Significance: Besides achieving a higher
    performance compared to state-of-the-art classifiers, the
    presented study is the first one to deal with the quality
    determination of heart sounds that are recorded by radar
    systems. The proposed method enables contactless and
    continuous heart sound monitoring for the detection of
    cardiovascular diseases.
    }, author = {Shi, Kilin and Schellenberger, Sven and Michler, Fabian and Steigleder, Tobias and Malessa, Anke and Lurz, Fabian and Ostgathe, Christoph and Weigel, Robert and Koelpin, Alexander}, cris = {https://cris.fau.de/converis/publicweb/publication/219338194}, year = {2019}, month = {08}, faupublication = {yes}, issn = {0018-9294}, journaltitle = {IEEE Transactions on Biomedical Engineering}, keywords = {biomedical engineering; biomedical informatics; biomedical signal processing; heart sounds; medical radar,pattern recognition; phonocardiography}, peerreviewed = {Yes}, shortjournal = {IEEE T BIO-MED ENG}, title = {Automatic Signal Quality Index Determination of Radar-Recorded Heart Sound Signals Using Ensemble Classification}, type = {Article in Journal}, }
  • A. Ali and G. Fischer, "Enabling Fake Base Station Detection through Sample-based Higher Order Noise Statistics" in 2019 42nd International Conference on Telecommunications and Signal Processing - IEEE TSP 2019, Budapest, Hungary, 2019 (to be published). [Bibtex]
    @inproceedings{ali2019c,
    abstract = {This paper presents computationally efficient fake base station (FBS) detection scheme through higher order statistical analysis at the user equipment (UE) side. In the proposed RF fingerprinting detection scheme, the UE inspects surrounding base stations (BS) by first extracting noise from the received signal through novel sample-based parametric estimation technique and then measuring the noise structuredness with the aid of fourth order moment i.e. kurtosis over the estimated noise samples. This reveals unique RF fingerprints of the legitimized regular base station (RBS) in terms of hardware impairments and resultantly indicates minimal impact from the non-linearities due to employment of costly and high precision analog and mixedsignal components, strong network-synchronous clock and a sophisticated linearization effort around the power amplifier (PA). In contrary, FBS exhibits different RF fingerprints containing larger amount of non-linearities in the received signal due to presence of large impairments. With the help of actual measurement results from RBS and various software defined radio (SDR) based FBS at different cellular standards and by defining a critical threshold of detection, we show that an FBS deviates a lot from the ideal Gaussian noise distribution and constitutes of multivariate distributions, whereas an RBS show minimal deviation from the reference and contains univariate noise distribution. We further calculate the observation sample time required to detect an FBS in an optimal MMSE sense and indicate with the help of results that the minimum time to identify a fake cell is 10ms.
    }, author = {Ali, Arslan and Fischer, Georg}, language = {English}, booktitle = {2019 42nd International Conference on Telecommunications and Signal Processing - IEEE TSP 2019}, cris = {https://cris.fau.de/converis/publicweb/publication/216263241}, year = {2019}, month = {07}, day = {01}, eventdate = {2019-07-01/2019-07-03}, faupublication = {yes}, keywords = {fake base station; hardware imperfections; higher order statistics; kurtosis; multivariate distribution; parametric noise estimation; physical layer security; RF fingerprinting; software defined radio}, note = {unpublished}, peerreviewed = {automatic}, title = {Enabling Fake Base Station Detection through Sample-based Higher Order Noise Statistics}, venue = {Budapest, Hungary}, }
  • I. Lau, F. Lurz, R. Weigel, and A. Koelpin, "An Error Compensation Algorithm for Indirect Resonant Planar Relative Permittivity Sensor Principles up to 100 GHz" in IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes, Bochum, 2019. [Bibtex]
    @inproceedings{lau2019b,
    abstract = {This paper presents an error compensation algorithm for indirect resonant planar relative permittivity sensor principles up to 100 GHz. Besides the measurement of the material under test (MUT), the algorithm requires additional measurements of at least two reference materials. The proposed algorithm is tested for the three most relevant modeling errors occurring while measuring with an indirect planar measurement principle. These include erroneous assumptions regarding the geometrical dimensions, the effective roughness and the air gap
    between the sensor and the MUT. The proposed algorithm results in an average improvement of the error of the extracted relativen permittivity values of 90.46 %.
    }, author = {Lau, Isabella and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander}, language = {English}, booktitle = {IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes}, cris = {https://cris.fau.de/converis/publicweb/publication/219143376}, year = {2019}, month = {07}, day = {16}, eventdate = {2019-07-16/2019-07-18}, faupublication = {yes}, keywords = {error compensation; materials nondestructive testing,microwave measurements; permittivity}, peerreviewed = {Yes}, title = {An Error Compensation Algorithm for Indirect Resonant Planar Relative Permittivity Sensor Principles up to 100 GHz}, type = {Konferenzschrift}, venue = {Bochum}, }
  • I. Lau, A. Hajian, F. Michler, G. Gold, F. Lurz, U. Schmid, K. Helmreich, R. Weigel, and A. Koelpin, "Influence of the PCB Manufacturing Process on the Measurement Error of Planar Relative Permittivity Sensors Up To 100 GHz", IEEE Transactions on Microwave Theory and Techniques, vol. 67, iss. 7, pp. 2793-2804, 2019. [DOI] [Bibtex]
    @article{lau2019,
    abstract = {Accurate and precise knowledge of the relative permittivity of printed circuit board (PCB) materials is essential for the reliable design of high-frequency circuits. For simplicity reasons, planar, resonant permittivity sensors, which are directly integrated on the unknown PCB material, are widely used. However, the sensors are affected by the nonidealities of the copper-clad laminate and PCB manufacturing process, e.g., the difference in roughness between the top and bottom sides of each metal layer. This paper analyzes the influence of these nonidealities on the extracted relative permittivity values of different sensor geometries in microstrip and substrate integrated waveguide (SIW) technology up to 100 GHz. Microstrip resonators are very sensitive against the investigated nonidealities. Additional roughness measurements and more detailed simulation models cannot noticeably reduce the uncertainties. SIW cavity sensors are more robust, and simple modeling approaches lead to low uncertainties smaller than 0.05 for the whole frequency range from 10 to 100 GHz.},
    author = {Lau, Isabella and Hajian, Ali and Michler, Fabian and Gold, Gerald and Lurz, Fabian and Schmid, Ulrich and Helmreich, Klaus and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/216484718},
    year = {2019},
    month = {07},
    day = {03},
    doi = {10.1109/TMTT.2019.2910114},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {Accuracy;manufacturingn process; materials nondestructive testing; microwave measurements;permittivity; printed circuit boards (PCBs); surface roughness; uncertainty.},
    number = {7},
    pages = {2793--2804},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Influence of the PCB Manufacturing Process on the Measurement Error of Planar Relative Permittivity Sensors Up To 100 GHz},
    type = {Article in Journal},
    url = {https://ieeexplore.ieee.org/document/8698275},
    volume = {67},
    }
  • J. Potschka, C. Söll, J. Kirchner, C. Mardin, M. Stadelmayer, T. Maiwald, S. Breun, K. Kolb, A. Bauch, M. Dietz, C. Beck, M. Völkel, A. Hagelauer, and R. Weigel, "Design of an Integrated Subretinal Implant Using Cellular Neural Networks for Binary Image Generation in a 130 nm BiCMOS Process" in Engineering in Medicine and Biology Conference, Berlin, 2019. [Bibtex]
    @inproceedings{potschka2019,
    author = {Potschka, Julian and Söll, Christopher and Kirchner, Jens and Mardin, Christian and Stadelmayer, Markus and Maiwald, Tim and Breun, Sascha and Kolb, Katharina and Bauch, Andreas and Dietz, Marco and Beck, Christopher and Völkel, Matthias and Hagelauer, Amelie and Weigel, Robert},
    booktitle = {Engineering in Medicine and Biology Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/217754593},
    year = {2019},
    month = {07},
    day = {23},
    eventdate = {2019-07-23/2019-07-27},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Design of an Integrated Subretinal Implant Using Cellular Neural Networks for Binary Image Generation in a 130 nm BiCMOS Process},
    type = {Konferenzschrift},
    venue = {Berlin},
    }

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All Publications...

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    @patent{lurz_patent_2016,
    author = {Lurz, Fabian and Lindner, Stefan and Koelpin, Alexander and Sept-Enzel, Gerold and Dingler, Peter and Halder, Ernst},
    cris = {lurz_patent_2016},
    year = {2016},
    month = {10},
    day = {13},
    number = {DE 102016119562 B3},
    title = {Elektrisches Messsystem zur Frequenzmessung und Erkennung von Störsignalen und Betriebsverfahren hierfür},
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    @patent{trautmann_patent_2016,
    abstract = {Die Erfindung betrifft ein System zur drahtlosen Übertragung von Energie und Daten, bei dem mindestens zwei in einem Abstand zueinander angeordnete Spulen oder elektrische Leiterbahnen für die Übertragung von Energie vorhanden sind. Dabei ist jeweils mindestens eine elektrische Spule oder elektrische Leiterbahn zur Übertragung von Energie und/oder mindestens eine elektrische Spule oder elektrische Leiterbahn zur Übertragung von Daten an jeweils eine elektrische Wechselspannungsquelle angeschlossen. Dabei ist mindestens eine elektrische Wechselspannungsquelle modulierbar. Die elektrischen Spulen oder elektrischen Leiterbahnen zur Übertragung von Daten sind mit elektrischer Spannung mit einer Frequenz, die kleiner als die Frequenz mit der eine elektrische Spannung zur Übertragung von Energie mittels der elektrischen Spulen oder elektrischen Leiterbahnen zur Übertragung von Energie eingesetzt ist, betrieben.},
    author = {Trautmann, Martin and Sanftl, Benedikt and Koelpin, Alexander and Heckel, Thomas and Frey, Lothar and Ditze, Stefan and Endruschat, Achim and Joffe, Christopher and Rosskopf, Andreas and Schriefer, Thomas},
    cris = {trautmann_patent_2016},
    year = {2016},
    month = {09},
    day = {29},
    keywords = {Inductive Power Transfer},
    number = {102016206767.2},
    title = {System zur drahtlosen Übertragung von Energie und Daten},
    type = {patent},
    }

COPYRIGHT NOTICE: Copyright and all rights of the material above are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by the appropriate copyright. The material may not be reposted without the explicit permission of the copyright holder.

COPYRIGHT NOTICE FOR IEEE PUBLICATIONS: © IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

COPYRIGHT NOTICE FOR EUMA PUBLICATIONS: © EUMA. Personal use of this material is permitted. Permission from European Microwave Association(EUMA) must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.


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