A low-complexity approximate message passing equalizer for OTFS system

Yang Zhang, Qunfei Zhang, Lingling Zhang, Chengbing He, Xinyuan Tian

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations

Abstract

The orthogonal time frequency space (OTFS) modulation has emerged as a potential candidate modulation scheme for high mobility wireless communications. However, OTFS may experience significant inter-Doppler interference (IDI) and inter-symbol interference (ISI) occur in the receiver. To jointly combat both interferences, we propose an efficient improved approximate message passing (AMP) equalizer for OTFS transmission over delay-Doppler channels in this paper. Specifically, a decoupling operation can be performed for joint interference cancellation, and the sparse feature of equivalent channel matrix is utilized in delay-Doppler domain. Then, the posterior mean and variance estimates of the transmitted symbol is reconstructed by the denoising step. Furthermore, a threshold-based convergence scheme is proposed with the purpose of trade-off the computational complexity and performance of the OTFS system. Simulation results demonstrate that the proposed improved AMP equalizer exhibits a better bit error rate (BER) performance with a reduced complexity compared to its conventional counterparts.

Original languageEnglish
Title of host publication2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages449-454
Number of pages6
ISBN (Electronic)9781665439442
DOIs
StatePublished - 28 Jul 2021
Event2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021 - Xiamen, China
Duration: 28 Jul 202130 Jul 2021

Publication series

Name2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021

Conference

Conference2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021
Country/TerritoryChina
CityXiamen
Period28/07/2130/07/21

Keywords

  • Approximate message passing
  • Delay-Doppler channels
  • OTFS

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