OTFS on Overspread Doubly Selective Channel  

作　　者：Qing Hua Liu Yun Shi Xiayang Yu Hua Ji Fei Cui Yinming 

机构地区：[1]College of Software Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China [2]School of Internet Finance and Information Engineering,Guangdong University of Finance,Guangzhou 510520,China [3]School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510641,China

出　　处：《China Communications》2024年第11期205-215,共11页中国通信（英文版）

基　　金：supported by National Natural Science Foundation of China(grant number 62071504);State Key Program of National Natural Science Foundation of China(grant numbers 62192712,62192711);Project of Science and Technology in Henan Province(grant numbers 222102210317,232102210078);Doctoral Research Foundation of Zhengzhou University of Light Industry(grant number 2021BSJJ030);Special Projects in Key Fields for General Universities of Guangdong Province(grant num 2021ZDZX1056)。

摘　　要：The orthogonal time frequency space(OTFS)modulation proposed in recent years is considered to have superior performance than orthogonal frequency division multiplexing(OFDM)for the doubly selective(DS)channels.The works in the existing literature on OTFS mainly focus on the cases where the channels are underspread(i.e.,the product of the delay spread and the Doppler spread is less than 1).In the scenario of overspread DS channel,which has large delay spread and severe Doppler spread,such as underwater acoustic(UWA)channel,the channel model in delay-Doppler(DD)Domain derived by existing work is no longer applicable.In this paper,we derive a more generalized expression of the channel model in delay-Doppler domain,which allows the product of the delay spread and Doppler spread to be larger than1.The result shows that the existing channel model is just a special case of the one we proposed.Using the proposed channel matrix in DD domain,we build the OTFS detectors with the minimum mean square error(MMSE)and message passing(MP)algorithms on overspread doubly selective channel.Finally,simulation results are presented to verify the theoretical derivation and the effectiveness of the detectors.

关 键 词：delay-Doppler domain doubly selective channel OTFS overspread underwater acoustic communications 

分 类 号：TN929.5[电子电信—通信与信息系统]