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European Radar Conference (EURAD)

作者： Pascal Kneuper Stephan Kruse Bjoern Luchterhandt Jan Tünnermann Ingrid Scharlau J. Christoph Scheytt Heinz Nixdorf Institute System and Circuit Technology Paderborn University Germany Cognitive Psychology Paderborn University Germany General and Biological Psychology Phillips University Marburg Germany

ISBN: (数字)9782874870613

ISBN: (纸本)9781728170602

This paper presents a 122 GHz Frequency Modulated Continuous Wave (FMCW) radar-based handheld device for sensory substitution for the visually impaired. Distance information from a miniaturized mmWave radar sensor is converted to tactile information by mapping it to an array of vibration actuators. The complete system is integrated into a portable device which is carried in the hand, with the actuators touching the fingertips. A user can explore the environment by combining the distance information provided through the tactile stimulus with the sense of direction gained by pointing the device. This allows to detect obstacles and make evasive manoeuvres to avoid collisions. Experimental results demonstrate that the device is well suited for sensory substitution applications.

关键词： Vibrations Actuators Frequency modulation Handheld computers Radar detection Tactile sensors Sensor arrays

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Wide-Band Frequency Synthesizer with Ultra-Low Phase Noise Using an Optical Clock Source

Wide-Band Frequency Synthesizer with Ultra-Low Phase Noise U...

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Microwave, MTT-S International Symposium

作者： Meysam Bahmanian Saeed Fard Bastian Koppelmann J. Christoph Scheytt System and Circuit Technology Group Heinz Nixdorf Institute Paderborn University Germany

ISBN: (数字)9781728168159

ISBN: (纸本)9781728168166

This paper presents an ultra-wideband and ultra-low noise frequency synthesizer using a mode-locked laser as its reference. The frequency synthesizer can lock in the frequency range from 2 GHz to 20 GHz on any harmonic of a mode-locked laser optical pulse train. The integrated rms-jitter (1 kHz-100 MHz) of the synthesizer is less than 5 fs in the frequency range from 4 GHz to 20 GHz with a typical value of 4 fs and a minimum of 3 fs. This is the first reported wideband phase locked loop achieving sub-10 fs rms-jitter for offset frequencies larger than 1 kHz.

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Reconfigurable and real-time nyquist OTDM demultiplexing in silicon photonics

arXiv

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arXiv 2021年

作者： Misra, Arijit Singh, Karanveer Meier, Janosch Kress, Christian Schwabe, Tobias Preußler, Stefan Christoph, J. Scheytt Schneider, Thomas The THz Photonics Group Technische Universität Braunschweig Schleinitzstraße 22 Braunschweig38106 Germany The Paderborn University System and Circuit Technology Heinz Nixdorf Institute Fürstenalle 11 Paderborn33098 Germany

We demonstrate for the first time, to the best of our knowledge, reconfigurable and real-time orthogonal time-domain demultiplexing of coherent multilevel Nyquist signals in silicon photonics. No external pulse source is needed and frequency-time coherence is used to sample the incoming Nyquist OTDM signal with orthogonal sinc-shaped Nyquist pulse sequences using Mach-Zehnder modulators. All the parameters such as bandwidth and channel selection are completely tunable in the electrical domain. The feasibility of this scheme is demonstrated through a demultiplexing experiment over the entire C-band (1530 nm - 1550 nm), employing 24 Gbaud Nyquist QAM signals due to experimental constraints on the transmitter side. However, the silicon Mach-Zehnder modulator with a 3-dB bandwidth of only 16 GHz can demultiplex Nyquist pulses of 90 GHz optical bandwidth suggesting a possibility to reach symbol rates up to 90 GBd in an integrated Nyquist transceiver. © 2021, CC BY.

关键词： Silicon photonics

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Analysis and Simulation of a Wireless Phased Array system with Optical Carrier Distribution and an Optical IQ Return Path

Analysis and Simulation of a Wireless Phased Array System wi...

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German Microwave Conference

作者： Stephan Kruse Christian Kress Heiko G. Kurz Thomas Schneider J. Christoph Scheytt Heinz Nixdorf Institute and System and Circuit Technology Paderborn University Germany Volkswagen Aktiengesellschaft Germany Technische Universität Braunschweig Germany

ISBN: (数字)9783982039718

ISBN: (纸本)9781728142067

In this paper we present a new system concept for an optoelectronic wireless phased array system. Like in a conventional phased array system with optical carrier distribution, optical fibers are used to distribute the carrier from the basestation to the wireless frontends. However in contrast to prior concepts, we propose to use an optical IQ return path from the wireless frontends back to the basestation. Furthermore, we reuse the optical carrier signal for the IQ return path which allows to avoid local oscillator lasers in the wireless frontends and reduces the hardware effort significantly. The system concept allows to integrate all components of an optoelectronic wireless frontend in a single chip using silicon photonics technology.

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Ultra-Low Phase Noise Frequency Synthesis for THz Communications Using Optoelectronic PLLs

Ultra-Low Phase Noise Frequency Synthesis for THz Communicat...

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International Workshop on Mobile Terahertz systems (IWMTS)

作者： J. Christoph Scheytt Dominik Wrana Meysam Bahmanian Ingmar Kallfass System and Circuit Technology Group Heinz Nixdorf Institute Paderborn University Paderborn Germany Istitute of Robust Power Semiconductor Systems University of Stuttgart Stuttgart Germany

ISBN: (数字)9781728155982

ISBN: (纸本)9781728155999

Recently it has been demonstrated that an optoelectronic phase-locked loop (OEPLL) using a mode-locked laser as a reference oscillator achieves significantly lower phase noise than conventional electronic frequency synthesizers. In this paper a concept for an OEPLL-based frequency synthesizer is presented and it is investigated how it can be used as a local oscillator (LO) for THz transceivers in order to improve the signal quality in THz wireless communications. The concept of the OEPLL is presented and it's measured phase noise is compared to the phase noise of a laboratory-grade electronic frequency synthesizer. The measured phase noise spectra of both synthesizers at 10 GHz are then used to model LO phase noise at 320 GHz. Based on models of generic zero-IF transmit and receive frontends, THz signals with different modulation formats and Baud rates are simulated at system level using the modeled LO phase noise for the two LO approaches. Finally, the results are compared.

关键词： Phase noise Frequency synthesizers Voltage-controlled oscillators Phase locked loops Wireless communication Bandwidth

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A 70 GHz Small-signal Bandwidth 40 GS/s Track-and-Hold Amplifier in 130 nm SiGe BiCMOS technology

A 70 GHz Small-signal Bandwidth 40 GS/s Track-and-Hold Ampli...

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IEEE International Conference on Electronics, circuits and systems

作者： Liang Wu Maxim Weizel J. Christoph Scheytt System and Circuit Technology Heinz Nixdorf Institute University of Paderborn Germany

This paper presents a broadband track-and-hold amplifier (THA) based on switched-emitter-follower (SEF) topology. The THA exhibits a record 3dB small-signal bandwidth of 70 GHz. With the high sampling rate of 40 GS/s, it achieves an effective number of bits (ENOB) of 7.5 bit at 1 GHz input frequency and an ENOB of >5 bit up to 15 GHz input frequency. The chip was fabricated in a 130 nm SiGe BiCMOS technology from IHP (SG13G2). It draws 110 mA from a -4 V supply voltage, dissipating 440 mW.

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70 GHz Large-signal Bandwidth Sampler Using Current-mode Integrate-and-Hold circuit in 130 nm SiGe BiCMOS technology

70 GHz Large-signal Bandwidth Sampler Using Current-mode Int...

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Asia-Pacific Conference on Microwave

作者： Liang Wu Maxim Weizel J. Christoph Scheytt System and Circuit Technology Heinz Nixdorf Institute University of Paderborn Germany

ISBN: (数字)9781728135175

ISBN: (纸本)9781728135182

This paper presents a broadband sampler IC using a current-mode integrated-and-hold-circuit (IHC) as sampling circuit. The sampler IC exhibits 1dB large-signal bandwidth of 70 GHz and excellent signal integrity on hold-mode. With a sampling rate of 5 GS/s, it achieves effective number of bits (ENOB) of 6 bit at 9.9 GHz input frequency. The chip was fabricated in a 130 nm SiGe BiCMOS technology from IHP.

关键词： Bandwidth Semiconductor device measurement Clocks Delays Silicon germanium BiCMOS integrated circuits Oscilloscopes

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Design of an automotive visible light communications link using an off-the-shelf LED headlight 16

Design of an automotive visible light communications link us...

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16. GMM/ITG-Fachtagung ANALOG 2018: Meet Your CAD Guy / Meet Your Designer - 16th GMM/ITG Symposium ANALOG 2018: Meet Your CAD Guy/Meet Your Designer

作者： Kruse, Stephan Kress, Christian Memedi, Agon Tebruegge, Claas Amjad, Muhammad Sohaib Scheytt, Christoph Dressler, Falko Heinz Nixdorf Institute and System and Circuit Technology Paderborn University Germany Heinz Nixdorf Institute Dept. of Computer Science Paderborn University Germany Hella GmbH and Co. KGaA Lippstadt Germany

ISBN: (纸本)9783800747542

We present a transmitter circuit to drive a commercial Light Emitting Diode (LED)-based headlight for automotive Visible Light Communication (VLC). Based on the design of the presented transmitter (TX), we provide a design methodology for VLC TXs and make it available as Open Hardware. Furthermore, a complete wireless VLC link is built using the GNU Radio signal processing tool chain and demonstrated on an Universal Software Radio Peripheral (USRP). The Total Harmonic Distortion (THD) of the system is below 5% for a wide input voltage range and the 1 dB compression point (P1dB) is at 1.02V, which makes the circuit attractive for more advanced modulation formates like Orthogonal Frequency Division Multiplexing (OFDM) or Pulse-Amplitude Modulation (PAM). © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach

关键词： Visible light communication

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Design of an Automotive Visible Light Communications Link using an Off-The-Shelf LED Headlight

Design of an Automotive Visible Light Communications Link us...

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ANALOG 2018;16th GMM/ITG-Symposium

作者： Stephan Kruse Christian Kress Agon Memedi Claas Tebruegge Muhammad Sohaib Amjad Christoph Scheytt Falko Dressler Heinz Nixdorf Institute and System and Circuit Technology Paderborn University Heinz Nixdorf Institute and Dept. of Computer Science Paderborn University

ISBN: (纸本)9783800747542

关键词： input voltage range Light emitting diodes Headlights variable length codes tool chain Telecommunication links Orthogonal frequency division multiplexing automotive engineering Total harmonic distortion Software radio off-the-shelf

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Results of the Ontology Alignment Evaluation Initiative 2022 17

Results of the Ontology Alignment Evaluation Initiative 2022

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17th International Workshop on Ontology Matching, OM 2022

作者： Pour, Mina Abd Nikooie Algergawy, Alsayed Buche, Patrice Castro, Leyla J. Chen, Jiaoyan Dong, Hang Fallatah, Omaima Faria, Daniel Fundulaki, Irini Hertling, Sven He, Yuan Horrocks, Ian Huschka, Martin Ibanescu, Liliana Jiménez-Ruiz, Ernesto Karam, Naouel Laadhar, Amir Lambrix, Patrick Li, Huanyu Li, Ying Michel, Franck Nasr, Engy Paulheim, Heiko Pesquita, Catia Saveta, Tzanina Shvaiko, Pavel Trojahn, Cassia Verhey, Chantelle Wu, Mingfang Yaman, Beyza Zamazal, Ondrej Zhou, Lu Linköping University Swedish E-Science Research Center Linköping Sweden Heinz Nixdorf Chair for Distributed Information Systems Friedrich Schiller University Jena Germany UMR IATE INRAE University of Montpellier France ZB MED Information Centre for Life Sciences Germany Department of Computer Science The University of Manchester United Kingdom Department of Computer Science University of Oxford United Kingdom Information School The University of Sheffield Sheffield United Kingdom University of Lisbon Portugal Institute of Computer Science-FORTH Heraklion Greece Data and Web Science Group University of Mannheim Germany Fraunhofer Institute for High-Speed Dynamics Ernst-Mach-Institut EMI Germany Université Paris-Saclay INRAE AgroParisTech UMR MIA Paris-Saclay France City University of London United Kingdom Fraunhofer FOKUS Institute for Applied Informatics University of Leipzig Germany University of Stuttgart Germany University of Gävle Sweden University Côte d'Azur CNRS Inria France Albert Ludwig University of Freiburg Germany LASIGE Faculdade de Ciências Universidade de Lisboa Portugal Trentino Digitale SpA Trento Italy Institut de Recherche en Informatique de Toulouse France World Data System International Technology Office United States Australian Research Data Commons Australia ADAPT Centre Trinity College Dublin Ireland Prague University of Economics and Business Czech Republic TigerGraph Inc. United States SIRIUS University of Oslo Norway

The Ontology Alignment Evaluation Initiative (OAEI) aims at comparing ontology matching systems on precisely defined test cases. These test cases can be based on ontologies of different levels of complexity and use different evaluation modalities. The OAEI 2022 campaign offered 14 tracks and was attended by 18 participants. This paper is an overall presentation of that campaign. © 2022 Copyright for this paper by its authors.

关键词： Ontology

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