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TU Berlin

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Andreas Pfadler, M.Sc.


Andreas Pfadler received the M.Sc. degree in telecommunication engineering with specialization in wireless communications from the Polytechnic University of Catalonia (UPC), Barcelona, Spain, in 2018. Since 2017, he is a member of the Signal Theory and Communication (TSC) Department of the UPC, Barcelona, Spain. He is currently working toward the Ph.D. degree under the supervision of Prof. Sławomir Stańczak with Volkswagen Group Research and the Technical University of Berlin.

He takes part in several research projects as the European project 5GCroCo and the German national project 5G NetMobil.

His research interests include antenna design, predictive quality of service, new waveforms and wave propagation.



5G NetMobil




Pulse-Shaped OTFS for V2X Short-Frame Communication with Tuned One-Tap Equalization
Citation key pfad2020itg
Author A. Pfadler, P. Jung and S. Stanczak
Year 2020
ISBN 978-3-8007-5200-3
Location Hamburg, Germany
Journal 24th International ITG Workshop on Smart Antennas, Poster presentation, February 18-20, 2020 in Hamburg, Germany
Month Feb.
Editor VDE
Abstract The recently proposed orthogonal time frequency and space (OTFS) waveform promises significant performance advantages for high mobility users. OTFS is a pulse-shaped multicarrier scheme with Gabor (Weyl-Heisenberg) structure and additional time-frequency (TF) spreading. The spreading of the symbols over the TF domain is utilizing the symplectic Fourier transform (SFFT). For coherent communication OTFS requires proper channel information and the use of appropriated equalizers to exploit the full spreading gain. The doubly-dispersive channel is first estimated with pilot and guard symbols placed in the delay-Doppler (DD) domain. One-tap equalization, favored due to their lower complexity, is then performed in the TF domain. However, an accurate estimation of the self-interference power is necessary to exploit full diversity with such linear equalizer. To enable short-frame vehicle-to-everything (V2X) communication, we propose to instantaneously estimate the selfinterference power using pilot and guard symbols for tuning the minimum mean square error (MMSE) equalizer. We evaluate this approach for vehicular channels generated by the geometricstatistical channel simulator Quadriga and with an OTFS transceiver architecture based on a polyphase implementation for orthogonalized Gaussian pulses. Comparing to a IEEE 802.11p compliant design, we show that in such vehicular scenarios OTFS significantly outperforms cyclic-prefix based orthogonal frequency-division multiplexing (OFDM) when instantaneously tuning the equalizer. Our results also indicate that with such an approach the promised OTFS gains can indeed be obtained with a linear equalizer.
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