感知辅助和原子选择门限机制下的MIMO-OTFS系统信道估计  

Channel estimation of MIMO-OTFS system based on sensing aided and atomic threshold mechanism

作　　者：彭艺[1] 陈志翔 杨青青[1] PENG Yi;CHEN Zhixiang;YANG Qingqing(Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学信息工程与自动化学院,昆明650500

出　　处：《电波科学学报》2025年第1期155-163,共9页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61761025)。

摘　　要：针对多输入多输出正交时频空间(multiple-input multiple-output orthogonal time frequency space,MIMO-OTFS)系统由最大时延、多普勒扩展、天线数量增加带来信道估计计算开销大、准确率下降的问题,提出了一种基于感知辅助和原子选择门限的广义正交匹配追踪(sensing aided generalized orthogonal matching pursuit algorithm based on atomic threshold,SA-TGOMP)信道估计算法。该算法首先将雷达探测的用户和周围环境信息转化为OTFS信道的初始索引集,然后引入以固定值选取相关性原子进行迭代的策略和原子选择门限进行支撑集更新。实验结果表明,本文算法能够有效提高信道估计精度的同时减少导频开销。Aiming at the problems of large channel estimation calculation overhead and accuracy degradation caused by the maximum delay,Doppler spread,and increase in the number of antennas in the multiple-input multipleoutput orthogonal time frequency space(MIMO-OTFS)system,a sensing aided generalized orthogonal matching pursuit algorithm based on atomic threshold(SA-TGOMP)channel estimation algorithm is proposed in this paper.This algorithm first converts the user and surrounding environment information detected by radar into the initial index set of the OTFS channel,and then introduces an iterative strategy of selecting relevant atoms with fixed values and an atomic threshold mechanism to update the support set.Experimental results show that the algorithm proposed in this paper can effectively improve the channel estimation accuracy while reducing pilot overhead.

关 键 词：多输入多输出正交时频空间(MIMO-OTFS) 压缩感知 感知辅助 信道估计 

分 类 号：TN929.5[电子电信—通信与信息系统]