Low Complexity Unitary Approximate Message Passing Based Equalization for OTFS System 18th International Symposium on Wireless Communication Systems ISWCS 22

ID：19 View Protection：ATTENDEE Updated Time：2022-10-12 12:53:12 Hits：506 Oral Presentation

Start Time：2022-10-20 15:00（Asia/Shanghai）

Duration：15min

Session：RS Regular Session » RS5RS5: Signal Processing for Communications (6)

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Orthogonal time frequency space (OTFS) modulation is a new promising two-dimensional (2D) modulation

technique for future wireless communication systems over high-mobility channels. To achieve the performance gain promised by

OTFS, the unitary approximate message passing (UAMP) based detector is widely used due to its robustness, low complexity and

superior performance. However, the complexity of the UAMP-based detector is high in the case of more practical waveforms,

such as the rectangular waveform, which hinders its practical implementation. In this work, we propose a low complexity

UAMP-based detector which inserts null symbols in the last few rows of the delay-Doppler domain according to the max delay of

the time-varying channel, and exploits the circulant property of the equivalent channel matrix to simplify the calculation

process of the UAMP detector. Simulation results show that the proposed detector has similar bit error rate (BER) performance

as compared with the original UAMP detector, but exhibits much lower complexity.

OTFS, UAMP, null-symbol, low-complexity, equalization

Zhejiang University

Zhejiang University

18th International Symposium on Wireless Communication Systems (ISWCS 22)