Yang Zhang, Qunfei Zhang, Lingling Zhang, Chengbing He, Xinyuan Tian
{"title":"A Low-Complexity Approximate Message Passing Equalizer for OTFS system","authors":"Yang Zhang, Qunfei Zhang, Lingling Zhang, Chengbing He, Xinyuan Tian","doi":"10.1109/ICCCWorkshops52231.2021.9538883","DOIUrl":null,"url":null,"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.","PeriodicalId":335240,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC Workshops)","volume":"18 2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2021 IEEE/CIC International Conference on Communications in China (ICCC Workshops)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICCCWorkshops52231.2021.9538883","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
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.