OTFS系统信道参数迭代估计算法  

An Iterative Channel Parameters Estimation Algorithm in OTFS

作　　者：常琪卿 王森 金婧[2] 李逸潇 龙航 CHANG Qiqing;WANG Sen;JIN Jing;LI Yixiao;LONG Hang(School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;Future Mobile Technology Laboratory,China Mobile Research Institute,Beijing 100032,China;Beijing Municipal Bureau of Economy and Information Technology,Beijing 100744,China)

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876 [2]中国移动通信研究院未来移动通信技术研究所,北京100032 [3]北京市经济和信息化局,北京100744

出　　处：《北京邮电大学学报》2023年第4期52-57,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61931005);北京邮电大学-中国移动研究院联合创新中心资助项目。

摘　　要：针对高时延、高多普勒频偏的时频双选信道环境,提出一种基于正交时频空(OTFS)系统的时频域信道参数迭代估计算法。利用时频域信道矩阵可以表示为多普勒频偏矩阵、信道复增益矩阵和时延矩阵三者乘积的性质,迭代更新各径多普勒频偏和时延参数估计结果,提高各参数估计的准确性。根据参数估计结果计算时频域信道矩阵,直接用于时频域均衡器,降低接收端复杂度。仿真结果表明,所提算法能够明显提高信道估计的性能,支持更灵活的参考信号配置,降低传输开销。An iterative channel estimation algorithm in time-frequency domain based on orthogonal time and frequency space(OTFS)system is proposed for time-frequency dual selection channel environment with high delay and high Doppler offset.Using the property that channel matrix in time-frequency domain can be expressed as the product of Doppler offset matrix,channel complex gain matrix and delay matrix,the estimation results of Doppler offset and delay parameters of each path are updated iteratively to improve the accuracy of each parameter estimation.The channel matrix in the time-frequency domain is calculated according to the parameter estimation results,which is directly used in the time-frequency domain equalizer to reduce the complexity of the receiver.Simulation results show that the proposed algorithm can significantly improve the performance of channel estimation,support more flexible reference signal configuration,and reduce transmission overhead.

关 键 词：正交时频空 信道估计 参考信号 

分 类 号：TN929.5[电子电信—通信与信息系统]