Mitarbeiter

M. Sc. Stefan Erhardt

Kontakt

  • E-Mail:
  • Telefon: 09131/85-25023
  • Fax: Neu:09131/85-28730
  • Raum: 01.178 B
  • Neu: Wetterkreuz 15
    91058 Erlangen

Über Stefan Erhardt

Lebenslauf

Stefan Erhardt hat sein Studium im Studiengang Elektrotechnik, Elektronik und Informationstechnik mit der Vertiefungsrichtung Allgemeine Elektrotechnik im Juli 2014 abgeschlossen. Seit Oktober 2014 ist er wissenschaftlicher Mitarbeiter am LTE.

Als Hauptprojekt entwickelt er ein extrem energiesparendes Ortungssystem zum Einsatz auf Fledermäusen.

Als Nebenprojekt betreut er die Entwicklung von circuiTikZ, einem LaTeX-Paket zum Zeichnen von Schaltungen. Außerdem gründete er 2012 das Projekt OpenTopoMap, eine topographische Karte auf Basis von OpenStreetMap- und SRTM-Daten. Als Funkamateur interessiert er sich besonders für digitale Betriebsarten und niedrigratige Sprachübertragung.

Bisherige Arbeitsgebiete

  • Mobilfunk
  • BOS-Funk
  • Software Defined Radio
  • Ultra-Low Power-Ortungssysteme
  • Entwicklung auf ARM Cortex-Architektur
  • HF-Schaltungstechnik bis 61 GHz

Abschlussarbeiten

Aus unseren Forschungsprojekten ergeben sich stets interessante Themen für Abschlussarbeiten (Bachelor / Master) oder Forschungspraktika in den Bereichen Systemdesign, Schaltungstechnik sowie Signalverarbeitung. Je nach persönlichen Vorlieben können Schwerpunkte auf Hardwareaufbau, Softwareimplementierungen oder auch auf Theorie gelegt werden. Für weitere Informationen und aktuelle Themen einfach unverbindlich vorbeikommen, E-Mail schreiben oder anrufen!

Laufende Arbeiten

  • Masterarbeit Andreas Depold: "Entwicklung, Aufbau und Charakterisierung eines vektoriellen Netzwerkanalysators aus kommerziellen Bauteilen"
  • Forschungspraktikum Maximilian Neumayer: "Analyse von IEEE 802.11 WLAN-Beacons in Matlab"
  • Masterarbeit Even Becker: "Development and characterization of a digital UHF two-way radio"

Abgeschlossene Arbeiten

  • Bachelorarbeit Alexander Kasper: "Entwicklung und Aufbau eines automatischen Detektionssystems von Kleinstsendern im 868 MHz-Band" (03/2019)
  • Bachelorarbeit Tobias Jung: "Entwicklung eines TDOA-basierten Ortungssystems mit RTL-SDR und Raspberry Pi" (01/2019)
  • Masterarbeit Thomas Kurin: "Digitale Sprachübertragung mit Codec2 auf Basis eines Sub-GHz-Transceivers" (11/2018)
  • Bachelorarbeit Timur Isbilen (extern) (11/2018)
  • Masterarbeit Christian Dorn: "Ultra Low-Power Indoor-Ortung auf Basis von integrierten Dual Band-Transceivern" (11/2018)
  • Masterarbeit Carolin Geitner (extern) (03/2018)
  • Forschungspraktikum Andreas Depold: "Untersuchung der Empfindlichkeit eines Sub-GHz-Transceivers bei analoger Frequenzmodulation" (02/2018)
  • Forschungspraktikum Manyu Wen: "TDOA Positioning System based on a Raspberry Pi and RTL-SDR" (01/2018)
  • Bachelorarbeit Markus Hofmann: "Aufbau einer mobilen Testplattform zur Mobilfunkortung mit GPS-Referenz" (10/2017)
  • Bachelorarbeit Josef Koller: "Aufbau einer energieautarken Basisstation mit kontinuierlich aktivem Empfänger und Fernwartungsmöglichkeit" (10/2017)
  • Masterarbeit Peter Rudert: "Weiträumige Kanalschätzung in Mobilfunknetzen unter Einbeziehung eines digitalen Geländemodells" (05/2017)
  • Masterarbeit Jonas Bühlmeyer: "FPGA-Implementierung eines GSM-Broadcast-Empfängers" (05/2017)
  • Bachelorarbeit Felix Bachbauer: "Implementierung und Evaluierung eines Verfahrens zur Anwesenheitsdetektion von Kleinstsendern mit Bluetooth Low Energy"  (04/2017)
  • Forschungspraktikum Christian Dorn: "Empfang und Demodulation von GSM auf General Purpose Sub-1GHz Transceivern" (11/2016)
  • Masterarbeit Niklas Duda: "Entwicklung und Charakterisierung eines portablen Testreceivers mit Testdemodulatoren und Spektrogrammanzeige" (10/2016)
  • Masterarbeit Oliver Pfadenhauer: "Entwicklung eines generischen SDR-Scanners mit hoher Messrate zur Erfassung von Mobilfunknetzen" (10/2016)
  • Masterarbeit Adrian Gonzalez: "Conceptual and experimental studies on improving internet service with rural trains" (12/2015)
  • Bachelorarbeit Andreas Depold: "Aufbau und Evaluierung eines Ortungssystems auf Basis von Mobilfunkzellinformationen" (10/2015)
  • Masterarbeit Felix Bott: "Implementierung eines automatischen Abrechnungssystems unter Gewährleistung der Datenintegrität" (08/2015)

Lehrveranstaltungen Sommersemester 2019

Preise & Auszeichnungen

  • S. Erhardt, R. Weigel, and A. Koelpin, Radio Wireless Week Student Paper Competition, 1st Place, IEEE, 2019. [Bibtex]
    @prize{erhardt_prize_2019,
    author = {Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE},
    cris = {erhardt_prize_2019},
    year = {2019},
    month = {01},
    day = {22},
    title = {Radio Wireless Week Student Paper Competition, 1st Place},
    type = {20773-Kleiner Preis},
    }
  • S. Erhardt, Leo-Brandt-Preis 2015, Deutsche Gesellschaft für Ortung und Navigation e.V., 2015. [Bibtex]
    @prize{erhardt_prize_2015,
    abstract = {Entwicklung und Aufbau von Teilkomponenten für ein 61 GHz ISM-Band Radarsystem in Substrate Integrated Waveguide-Technologie},
    author = {Erhardt, Stefan},
    booktitle = {Deutsche Gesellschaft für Ortung und Navigation e.V.},
    cris = {erhardt_prize_2015},
    year = {2015},
    month = {07},
    day = {07},
    title = {Leo-Brandt-Preis 2015},
    type = {20773-Kleiner Preis},
    }

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.

Publikationen

2019

  • S. Erhardt, R. Weigel, and A. Koelpin, "A Small and Lightweight Ultra-Low Power GSM Cell Tracker" in Radio & Wireless Week 2019, Orlando, Florida, 2019. [Bibtex]
    @inproceedings{erhardt2019,
    abstract = {In this publication a logger is introduced that is small and lightweight enough to be carried by bats. It tracks the GSM downlink spectrum, enabling coarse localization. The logger contains a Sub-GHz transceiver, a microcontroller and a DC/DC converter assembled on a flexible printed circuit board (PCB) that is directly mounted on a lithium coin cell battery. The total weight is approximately 2.1 g and the size is comparable to two stacked 1 Euro Cent coins after coating the logger with epoxy resin. A flexible nickel titanium wire antenna is used for receiving GSM signals and for transmitting in the European 868 MHz short-range devices (SRD) band. In a short-term field test the functionality was proven.},
    author = {Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Radio & Wireless Week 2019},
    cris = {https://cris.fau.de/converis/publicweb/publication/207435679},
    year = {2019},
    month = {01},
    day = {20},
    eventdate = {2019-01-20/2019-01-23},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Small and Lightweight Ultra-Low Power GSM Cell Tracker},
    type = {Konferenzschrift},
    venue = {Orlando, Florida},
    }

2018

  • S. Erhardt, B. Gäde, A. Koelpin, and R. Weigel, "Enhanced GSM Broadcast Receiver using the Phase Output of a Sub-GHz Transceiver" in 2018 48th European Microwave Conference (EuMC), Madrid, Spain, 2018, pp. 1137-1140. [DOI] [Bibtex]
    @inproceedings{erhardt2018a,
    abstract = {With Sub-GHz transceivers it is possible to receive GSM broadcast messages, for example for implementing cell-ID based localization. In this publication the phase information output of an ultra-low power Sub-GHz transceiver is used for a software defined GSM receiver. For enhanced results channel estimation and equalization can be applied.},
    author = {Erhardt, Stefan and Gäde, Bernhard and Koelpin, Alexander and Weigel, Robert},
    booktitle = {2018 48th European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/200219991},
    year = {2018},
    month = {09},
    day = {25},
    doi = {10.23919/EUMC.2018.8541538},
    eventdate = {2018-09-25/2018-09-27},
    faupublication = {yes},
    keywords = {GSM;Receivers;Transceivers;Frequency modulation;Registers;Channel estimation;GSM;signal processing;channel estimation;equalizers},
    pages = {1137--1140},
    peerreviewed = {Yes},
    title = {Enhanced GSM Broadcast Receiver using the Phase Output of a Sub-GHz Transceiver},
    type = {Konferenzschrift},
    venue = {Madrid, Spain},
    }
  • S. Erhardt, F. Pflaum, R. Weigel, and A. Koelpin, "Real-Time GSM Broadcast Receiver on a Cortex-M4 Microcontroller" in Radio & Wireless Week, Anaheim, California, USA, 2018, pp. 55-58. [DOI] [Bibtex]
    @inproceedings{erhardt2018,
    abstract = {Recent microcontrollers provide enough computing power to perform signal processing while still being energy efficient and enable more flexibility than FPGAs. A fully functional GSM broadcast receiver was implemented on a Cortex-M4 microcontroller that is able to decode broadcast control channel (BCCH) messages. With several algorithmic optimizations it is able to operate in real-time in combination with a Sub-GHz transceiver as RF front-end. The timing was proven by measurements with an logic analyzer.},
    author = {Erhardt, Stefan and Pflaum, Felix and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Radio & Wireless Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/111068364},
    year = {2018},
    month = {01},
    day = {14},
    doi = {10.1109/WISNET.2018.8311563},
    eventdate = {2018-01-14/2018-01-17},
    faupublication = {yes},
    pages = {55--58},
    peerreviewed = {Yes},
    title = {Real-Time GSM Broadcast Receiver on a Cortex-M4 Microcontroller},
    type = {Konferenzschrift},
    venue = {Anaheim, California, USA},
    }
  • B. Scheiner, S. Mann, F. Lurz, F. Michler, S. Erhardt, S. Lindner, R. Weigel, and A. Koelpin, "Microstrip-to-Waveguide Transition in Planar Form Using a Substrate Integrated Waveguide" in Radio and Wireless Symposium (RWS), 2018 IEEE, Anaheim, CA, USA, 2018, pp. 18-20. [DOI] [Bibtex]
    @inproceedings{scheiner2018,
    author = {Scheiner, Benedict and Mann, Sebastian and Lurz, Fabian and Michler, Fabian and Erhardt, Stefan and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {Radio and Wireless Symposium (RWS), 2018 IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/110064284},
    year = {2018},
    month = {01},
    day = {14},
    doi = {10.1109/RWS.2018.8304934},
    eventdate = {2018-01-14/2018-01-17},
    eventtitle = {IEEE Radio Wireless Symposium},
    faupublication = {yes},
    pages = {18--20},
    peerreviewed = {Yes},
    title = {Microstrip-to-Waveguide Transition in Planar Form Using a Substrate Integrated Waveguide},
    type = {Konferenzschrift},
    venue = {Anaheim, CA, USA},
    }

2017

  • S. Erhardt, R. Weigel, and A. Koelpin, "Receiving GSM Broadcast Channels with an Ultra-Low Power Sub-GHz Transceiver" in European Microwave Conference, Nürnberg, Germany, 2017, pp. 380-383. [DOI] [Bibtex]
    @inproceedings{erhardt2017,
    abstract = {Mobile phone front-end and baseband modules are hard to obtain on the market for end customers. Thus, software defined radios are widely used in research and development, enabling many opportunities for digital signal processing. In this publication a novel option to receive GSM signals is suggested by using an ultra-low power Sub-GHz transceiver in a legacy mode. The device outputs raw demodulated bits while the signal processing is realized in software. The functionality is proven and quantified by measurements.},
    author = {Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/108468184},
    year = {2017},
    month = {10},
    day = {10},
    doi = {10.23919/EUMC.2017.8230869},
    eventdate = {2017-10-10/2017-10-12},
    faupublication = {yes},
    pages = {380--383},
    peerreviewed = {Yes},
    title = {Receiving GSM Broadcast Channels with an Ultra-Low Power Sub-GHz Transceiver},
    type = {Konferenzschrift},
    venue = {Nürnberg, Germany},
    }
  • F. Michler, S. Lindner, F. Lurz, S. Erhardt, R. Weigel, and A. Koelpin, "Zero-Bias Schottky Power Detector Design for Six-Port based Radar Systems" in European Microwave Conference, Nürnberg, Germany, 2017. [DOI] [Bibtex]
    @inproceedings{michler2017,
    author = {Michler, Fabian and Lindner, Stefan and Lurz, Fabian and Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/108331564},
    year = {2017},
    month = {10},
    day = {08},
    doi = {10.23919/EUMC.2017.8230841},
    eventdate = {2017-10-08/2017-10-13},
    faupublication = {yes},
    isbn = {9782874870477},
    peerreviewed = {Yes},
    title = {Zero-Bias Schottky Power Detector Design for Six-Port based Radar Systems},
    type = {Konferenzschrift},
    venue = {Nürnberg, Germany},
    }
  • F. Pflaum, S. Erhardt, R. Weigel, and A. Koelpin, "RSSI-based Localization With Minimal Infrastructure Using Multivariate Statistic Techniques" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Phoenix, AZ, USA, 2017, pp. 69-72. [DOI] [Bibtex]
    @inproceedings{pflaum2017,
    abstract = {In this paper a new approach to localization of mobile nodes in wireless sensor networks is presented which utilizes the measurement of the received signal strength indicator by multiple receivers concentrated in a small area and applies the technique of linear discriminant analysis to the received data. The concept of gathering all receivers at a single spot provides great flexibility, while good spatial resolution is still achieved. This is demonstrated by a test network operating in the sub-GHz-range around 868 MHz.},
    author = {Pflaum, Felix and Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/107088344},
    year = {2017},
    month = {01},
    day = {15},
    doi = {10.1109/WISNET.2017.7878758},
    eventdate = {2017-01-15/2017-01-18},
    faupublication = {yes},
    keywords = {wireless; wsn; lda; statistics; localization},
    pages = {69--72},
    peerreviewed = {Yes},
    title = {RSSI-based Localization With Minimal Infrastructure Using Multivariate Statistic Techniques},
    venue = {Phoenix, AZ, USA},
    }

2016

  • S. Wibbing, S. Mann, F. Lurz, S. Erhardt, S. Lindner, R. Weigel, and A. Koelpin, "A cost-efficient 61 GHz high-resolution radar sensor for industrial positioning and distance measurement" in 21st International Conference on Microwave, Radar and Wireless Communications (MIKON), Krakau, Poland, 2016, pp. 1-4. [DOI] [Bibtex]
    @inproceedings{wibbing2016a,
    abstract = {In this paper a novel 61GHz radar sensor node for industrial positioning and distance measurement is presented. The sensor provides numerous functions enabling a broad range of signal processing technologies and is designed with regard to cost-efficient implementation only using commercial available components without limiting the area of possible applications. Beside the requirement analysis and system design, several measurements of antenna isolation and distance resolution are depicted and discussed.},
    author = {Wibbing, Sascha and Mann, Sebastian and Lurz, Fabian and Erhardt, Stefan and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {21st International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/124224584},
    year = {2016},
    month = {05},
    day = {09},
    doi = {10.1109/MIKON.2016.7491940},
    eventdate = {2016-05-09/2016-05-11},
    faupublication = {yes},
    isbn = {9781509022144},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A cost-efficient 61 GHz high-resolution radar sensor for industrial positioning and distance measurement},
    venue = {Krakau, Poland},
    }
  • S. Mann, S. Linz, S. Erhardt, S. Lindner, F. Lurz, H. Maune, R. Weigel, and A. Koelpin, "Differential Measuring Dual Six-Port Concept and Antenna Design for an Inline Foil Thickness Sensor" in German Microwave Conference (GeMiC), Bochum, Germany, 2016, pp. 165-168. [DOI] [Bibtex]
    @inproceedings{mann2016a,
    abstract = {Sensor elements play an important role in future manufacturing plants. This paper presents a solution for an foil thickness sensor for running production lines. Based on the elaborated Six-Port concept, a differential measuring concept is proposed and discussed. Furthermore, an end-fire antenna design for the addressed application is demonstrated and far field measurement results are shown and compared to simulation. Finally, interference effects between two antennas are experimentally investigated as a function of the relative rotation between two oppositely placed devices.},
    author = {Mann, Sebastian and Linz, Sarah and Erhardt, Stefan and Lindner, Stefan and Lurz, Fabian and Maune, Holger and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108104084},
    year = {2016},
    month = {03},
    day = {14},
    doi = {10.1109/GEMIC.2016.7461581},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    pages = {165--168},
    peerreviewed = {Yes},
    title = {Differential Measuring Dual Six-Port Concept and Antenna Design for an Inline Foil Thickness Sensor},
    venue = {Bochum, Germany},
    }

2015

  • S. Mann, S. Erhardt, S. Lindner, F. Lurz, S. Linz, F. Barbon, R. Weigel, and A. Koelpin, "Diode Detector Design for 61 GHz Substrate Integrated Waveguide Six-Port Radar Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), San Diego, CA, USA, 2015, pp. 44-46. [DOI] [Bibtex]
    @inproceedings{mann2015,
    abstract = {Radar sensors play a key role in today’s industrial automation. Besides high accuracy, modern radar sensors have to feature high precision as well as challenging update rates. Six-Port wave correlators enable high phase resolution at high frequencies and therefore a high accuracy in radar applications. A Schottky diode detector applied to a substrate integrated waveguide (SIW) Six-Port is presented and measured. Furthermore, a displacement measurement using the SIW structure is performed.},
    author = {Mann, Sebastian and Erhardt, Stefan and Lindner, Stefan and Lurz, Fabian and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/122822964},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127415},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    keywords = {Detector; interferometer,; millimeter-wave; Six-Port; RADAR; phase measurement},
    pages = {44--46},
    peerreviewed = {Yes},
    title = {Diode Detector Design for 61 GHz Substrate Integrated Waveguide Six-Port Radar Systems},
    venue = {San Diego, CA, USA},
    }

2014

  • S. Erhardt, "Entwicklung und Aufbau von Teilkomponenten für ein 61 GHz ISM-Band Radarsystem in Substrate Integrated Waveguide-Technologie," Masterarbeit , FAU Erlangen-Nürnberg, 2014. [Bibtex]
    @thesis{erhardt2014,
    author = {Erhardt, Stefan},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/109785324},
    year = {2014},
    month = {07},
    entrysubtype = {Masterarbeit},
    faupublication = {yes},
    keywords = {Substrate Integrated Waveguide; Radar; 61 GHz; ISM-Band},
    peerreviewed = {No},
    title = {Entwicklung und Aufbau von Teilkomponenten für ein 61 GHz ISM-Band Radarsystem in Substrate Integrated Waveguide-Technologie},
    type = {Masterarbeit},
    }

2011

  • S. Erhardt, "Implementierung und Evaluierung eines drahtlosen TDOA-Ortungssystems," Bachelorarbeit , FAU Erlangen-Nürnberg, 2011. [Bibtex]
    @thesis{erhardt2011,
    author = {Erhardt, Stefan},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/109088144},
    year = {2011},
    month = {05},
    entrysubtype = {Bachelorarbeit},
    faupublication = {yes},
    keywords = {TDOA; Localization; Hardware; GSM},
    peerreviewed = {No},
    title = {Implementierung und Evaluierung eines drahtlosen TDOA-Ortungssystems},
    type = {Bachelorarbeit},
    }

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.