面向正交时频空的低复杂度信号检测算法  

Low Complexity Signal Detection Algorithm for Orthogonal Time Frequency Space Modulation

作　　者：王丹[1] 李峰 夏麒煜 WANG Dan;LI Feng;XIA Qiyu(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《小型微型计算机系统》2025年第2期443-448,共6页Journal of Chinese Computer Systems

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0454)资助。

摘　　要：为了解决高速多径信道难以实现可靠传输的问题,移动通信系统中引入了正交时频空(OTFS)调制技术.针对接收端信号检测算法复杂度高的问题,本文提出了一种基于阻尼因子的逐bit消息传递(MP)检测方案,利用信道矩阵的稀疏性来简化消息传递中的因子图.相较于传统逐符号消息传递算法,添加对数似然比(LLR)将算法精度提高至bit级,同时对节点间传递的消息添加阻尼因子加快收敛,在此基础上改进消息传递的规则,进一步降低算法的计算次数.仿真结果表明,改进型的信号检测算法加快了算法收敛,在保证接收端误码性能的同时降低了算法的复杂度.In order to solve the problem of difficulty in achieving reliable transmission in high-speed multipath channels,orthogonal time frequency space(OTFS)modulation technology has been introduced into mobile communication systems.This paper proposes a bit by bit message passing(MP)detection scheme based on damping factor to address the high complexity of signal detection algorithms at the receiving end.The sparsity of the channel matrix is utilized to simplify the factor graph in message passing.Compared to traditional symbol by symbol message passing algorithms,adding logarithmic likelihood ratio(LLR)improves the accuracy of the algorithm to bit level,while adding damping factors to accelerate convergence of messages passed between nodes.Based on this,the rules for message passing are improved to further reduce the computational complexity of the algorithm.The simulation results show that the improved signal detection algorithm accelerates the convergence of the algorithm,while ensuring the error rate performance of the receiver while reducing the complexity of the algorithm.

关 键 词：正交时频空 信号检测 消息传递 稀疏矩阵 阻尼因子 

分 类 号：TN929[电子电信—通信与信息系统]