高速移动环境下OTSM迭代检测算法研究  

Research on OTSM Iterative Detection Algorithm in High-speed Mobile Environment

作　　者：李国军[1,2] 龙锟 叶昌荣 梁佳文 LI Guojun;LONG Kun;YE Changrong;LIANG Jiawen(Lab of Beyond LOS Reliable Information Transmission,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Postdoctoral Research Workstation of Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学超视距可信信息传输研究所,重庆400065 [2]重庆邮电大学光电工程学院,重庆400065 [3]重庆邮电大学通信与信息工程学院,重庆400065 [4]重庆邮电大学光电信息感测与传输技术重庆市重点实验室博士后科研工作站,重庆400065

出　　处：《电子与信息学报》2023年第6期2098-2104,共7页Journal of Electronics & Information Technology

基　　金：国家重点研发计划(2019YFC1511300);重庆市基础研究与前沿探索项目(cstc2021ycjh-bgzxm0072)。

摘　　要：正交时序复用(Orthogonal Time Sequency Multiplexing,OTSM)通过级联时分和沃尔什-哈达玛(WHT)复用将信息符号在时延和序列域进行复用。由于WHT在调制解调过程不需要进行复杂的乘法运算,相比于正交时频空(OTFS)调制有更低的调制复杂度。该文针对高速移动环境下的OTSM系统提出了一种二级均衡器:首先利用信道矩阵的稀疏性和带状结构在时域逐块进行低复杂度MMSE检测;随后采用高斯-赛德尔(GS)迭代检测进一步消除残余符号干扰。仿真结果表明,所提算法与基于单抽头频域均衡的GS迭代检测算法相比,采用16QAM调制且误码率为10–4时有1.8 dB性能增益。Orthogonal Time Sequency Multiplexing(OTSM)multiplexes information symbols in the delaysequence domain through concatenated time division and Walsh-Hadamard multiplexing.Due to the Walsh-Hadamard Transform(WHT)does not require complex multiplication operations in the modulation and demodulation process,it has lower modulation complexity than Orthogonal Time-Frequency Space(OTFS).In this paper,a two-stage equalizer is proposed for OTSM systems in high-speed mobile environments.First,lowcomplexity MMSE detection is performed block-by-block in the time domain by utilizing the sparsity and band structure of the channel matrix;Then Gauss-Seid(GS)iterative detection further removes residual symbol interference.The simulation results show that,compared with the GS iterative detection algorithm based on single-tap frequency domain equalization,the proposed algorithm has a performance gain of 1.8 dB when 16QAM modulation is used and the bit error rate is 10–4.

关 键 词：正交时序复用 时延-序列域 沃尔什-哈达玛变换 高斯-赛德尔迭代检测 

分 类 号：TN926[电子电信—通信与信息系统]