Successive interference cancellation aided bidirectional soft decision feedback equalization for OTFS systems

Zihao Ye, Shefeng Yan*, Zeping Sui, Hongming Zhang, Sumei Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Soft decision feedback equalization (SDFE) paradigms are conceived for the orthogonal time frequency space (OTFS) modulation in this letter. The proposed schemes are performed by reconstructing the delay-Doppler (DD)-banded channel matrix, while the successive interference cancellation (SIC) and soft decision feedback techniques are exploited for mitigating inter-symbol interference (ISI). Moreover, the SDFE is beneficially amalgamated with the bidirectional structure, yielding the bidirectional SDFE (Bi-SDFE). Explicitly, by combining the forward and backward SDFEs’ outputs, the proposed Bi-SDFE is capable of attaining both bidirectional diversity and error propagation mitigation. It is demonstrated that the convergence-enhanced Bi-SDFE can attain a better bit error ratio (BER) performance compared to some existing solutions.
Original languageEnglish
JournalIEEE Wireless Communications Letters
Early online date14 Aug 2023
DOIs
Publication statusEarly online date - 14 Aug 2023
Externally publishedYes

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