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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




Mobility Modes for Pulse-Shaped OTFS with Linear Equalizer
Citation key pfad2020gc
Author A. Pfadler, P. Jung and S. Stanczak
Year 2020
Journal IEEE Globecom 2020, December 7-11, Taipei, Taiwan
Month Dec
Editor IEEE
Abstract Orthogonal time frequency and space (OTFS) modulation is a pulse-shaped Gabor signaling scheme with additional time-frequency (TF) spreading using the symplectic finite Fourier transform (SFFT). With sufficient accurate channel information and sophisticated equalizers it promises performance gains in terms of robustness for high mobility users. To fully exploit diversity in OTFS, the 2D-deconvolution implemented by a linear equalizer should approximately invert the doubly dispersive channel operation, which however is a twisted convolution. In theory, this is achieved in a first step by matching the TF grid and the Gabor synthesis and analysis pulses to the delay and Doppler spread of the channel. However, in practice, one always has to balance between supporting high granularity in delay-Doppler (DD) spread, and multi-user and network aspects. In this paper, we propose mobility modes with distinct grid and pulse matching for different doubly dispersive channel. To account for remaining self-interference, we tune the minimum mean square error (MMSE) linear equalizer without the need of estimating channel cross talk coefficients. We evaluate our approach with the QuaDRiGa channel simulator and with OTFS transceiver architecture based on a polyphase implementation for orthogonalized Gaussian pulses. In addition, we compare OTFS to a IEEE 802.11p compliant design of cyclic prefix (CP) based orthogonal frequency-division multiplexing (OFDM). Our results indicate that with an appropriate mobility mode, the potential OTFS gains can be indeed achieved with linear equalizers to significantly outperforms OFDM.
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