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 

机构地区：[1]Department of Electronic and Electrical Engineering,Southern University of Science and Technology,Shenzhen,China [2]Faculty of Electrical Engineering and Computer Science,Technical University of Berlin,Berlin,Germany [3]School of Mathematics and Statistics,Xi’an Jiaotong University,Xi’an,China [4]Department of Communication Engineering,Beijing University of Posts and Telecommunications,Beijing,China [5]China Academy of Information and Communications Technology,Beijing,China [6]School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing,China [7]School of Information Science and Technology,Southwest Jiaotong University,Chengdu,China

出　　处：《China Communications》2023年第6期1-25,共25页中国通信（英文版）

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。

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.

关 键 词：OTFS 6G delay-Doppler(DD)domain 

分 类 号：TN929.5[电子电信—通信与信息系统]