BER Performance Analysis of OTFS Systems with Power Allocation

作     者：Zhenduo Wang Zhipeng Liu Zhiguo Sun Xiaoyan Ning Zhenduo Wang;Zhipeng Liu;Zhiguo Sun;Xiaoyan Ning

作者机构：College of Information and Communication EngineeringHarbin Engineering UniversityHarbin 150001China 

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

年 卷 期：2023年第20卷第1期

页      面：24-35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 the National Natural Science Foundation of China under Grant 62001138 Heilongjiang Provincial Natural Science Foundation of China under Grant LH2021F009 China Postdoctoral Science Foundation under Grant 2020M670885 Hei Long Jiang Postdoctoral Foundation under Grant LBH-Z20049。 

主　　题：OTFS PA ZF MMSE BER analysis 

摘      要：Orthogonal time frequency space(OTFS),as a novel 2-D modulation technique,has been proposed to achieve better BER performances over delayDoppler channels.In this paper,we propose two different power allocation(PA)algorithms in OTFS systems with zero forcing(ZF)or minimum mean square error(MMSE)equalization,where general formulas with PA are derived in advance under the condition of minimum BER(MBER)criterion.On one hand,a suboptimal MBER power allocation method is put forward to achieve better BER performances,and then analytical BER expressions are derived with proposed PA strategy.Considering the case of MMSE equalization,a combined subsymbol allocation(SA)and PA strategy is raised,where some subsymbols may be abandoned due to worse channel conditions,and then it is proven effectively to improve BER performances through theoretical and simulation results.Furthermore,BER performances with proposed joint SA and PA strategy are also investigated in delay-Doppler channels,where an improved message passing(MP)receiver based on equivalent channel matrix with PA is given.