A Survey on Low Complexity Detectors for OTFS Systems  

作　　者：ZHANG Zhengquan LIU Heng WANG Qianli FAN Pingzhi 

机构地区：[1]Key Lab of Information Coding and Transmission,Southwest Jiaotong University,Chengdu 611756,China [2]State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an 710071,China

出　　处：《ZTE Communications》2021年第4期3-15,共13页中兴通讯技术（英文版）

基　　金：supported in part by the NSFC Project under Grant No.61871334;part by the open research fund of the State Key Laboratory of Integrated Services Networks,Xidian University under Grant No.ISN21-15;in part by the Fundamental Research Funds for the Central Universities,SWJTU under Grant No.2682020CX79;supported by the NSFC project under Grant No.61731017 and the“111”project under Grant No.111-2-14.

摘　　要：The newly emerging orthogonal time frequency space(OTFS)modulation can ob⁃tain delay-Doppler diversity gain to significantly improve the system performance in high mobility wireless communication scenarios such as vehicle-to-everything(V2X),high-speed railway and unmanned aerial vehicles(UAV),by employing inverse symplectic finite Fouri⁃er transform(ISFFT)and symplectic finite Fourier transform(SFFT).However,OTFS modu⁃lation will dramatically increase system complexity,especially at the receiver side.Thus,de⁃signing low complexity OTFS receiver is a key issue for OTFS modulation to be adopted by new-generation wireless communication systems.In this paper,we review low complexity OTFS detectors and provide some insights on future researches.We firstly present the OTFS system model and basic principles,followed by an overview of OTFS detector structures,classifications and comparative discussion.We also survey the principles of OTFS detection algorithms.Furthermore,we discuss the design of hybrid OTFS and orthogonal frequency di⁃vision multiplexing(OFDM)detectors in single user and multi-user multi-waveform commu⁃nication systems.Finally,we address the main challenges in designing low complexity OT⁃FS detectors and identify some future research directions.

关 键 词：high mobility wireless communications OTFS ISFFT SFFT delay-Doppler di⁃versity iterative maximum ratio combining(MRC)detection message passing detection 

分 类 号：TN92[电子电信—通信与信息系统] TN761[电子电信—信息与通信工程]