New Delay Doppler Communication Paradigm in 6G Era:A Survey of Orthogonal Time Frequency Space(OTFS)

作     者：Weijie Yuan Shuangyang Li Zhiqiang Wei Yuanhao Cui Jiamo Jiang Haijun Zhang Pingzhi Fan Weijie Yuan;Shuangyang Li;Zhiqiang Wei;Yuanhao Cui;Jiamo Jiang;Haijun Zhang;Pingzhi Fan

作者机构：Department of Electronic and Electrical EngineeringSouthern University of Science and TechnologyShenzhenChina Faculty of Electrical Engineering and Computer ScienceTechnical University of BerlinBerlinGermany School of Mathematics and StatisticsXi’an Jiaotong UniversityXi’anChina Department of Communication EngineeringBeijing University of Posts and TelecommunicationsBeijingChina China Academy of Information and Communications TechnologyBeijingChina School of Computer and Communication EngineeringUniversity of Science and Technology BeijingBeijingChina School of Information Science and TechnologySouthwest Jiaotong UniversityChengduChina 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2023年第20卷第6期

页      面：1-25页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 

基　　金：supported in part by National Natural Science Foundation of China under Grant 62101232 in part by Guangdong Provincial Natural Science Foundation under Grant 2022A1515011257 in part by Shenzhen Science and Technology Program under Grant JCYJ20220530114412029。 

主　　题：OTFS 6G delay-Doppler(DD)domain 

摘      要：In the 6G era,Space-Air-Ground Integrated Network(SAGIN)are anticipated to deliver global coverage,necessitating support for a diverse array of emerging applications in high-mobility,hostile environments.Under such conditions,conventional orthogonal frequency division multiplexing(OFDM)modulation,widely employed in cellular and Wi-Fi communication systems,experiences performance degradation due to significant Doppler shifts.To overcome this obstacle,a novel twodimensional(2D)modulation approach,namely orthogonal time frequency space(OTFS),has emerged as a key enabler for future high-mobility use cases.Distinctively,OTFS modulates information within the delay-Doppler(DD)domain,as opposed to the timefrequency(TF)domain utilized by OFDM.This offers advantages such as Doppler and delay resilience,reduced signaling latency,a lower peak-to-average ratio(PAPR),and a reduced-complexity implementation.Recent studies further indicate that the direct interplay between information and the physical world in the DD domain positions OTFS as a promising waveform for achieving integrated sensing and communications(ISAC).In this article,we present an in-depth review of OTFS technology in the context of the 6G era,encompassing fundamentals,recent advancements,and future directions.Our objective is to provide a helpful resource for researchers engaged in the field of OTFS.