北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2023, Vol. 46 ›› Issue (4): 52-57.

• 论文 • 上一篇    下一篇

OTFS系统信道参数迭代估计算法

常琪卿1,王森2,金婧2,李逸潇3,龙航1   

  1. 1. 北京邮电大学 信息与通信工程学院
    2. 中国移动通信研究院
    3. 北京市经济和信息化局


  • 收稿日期:2022-05-30 修回日期:2022-10-11 出版日期:2023-08-28 发布日期:2023-08-24
  • 通讯作者: 龙航 E-mail:lhrzrzlh@bupt.edu.cn
  • 基金资助:
    国家自然科学基金项目; 北京邮电大学-中国移动研究院联合创新中心资助项目

An iterative channel parameters estimation algorithm in OTFS systems

CHANG Qiqing1, WANG Sen2, JIN Jing2, LI Yixiao3, LONG Hang1#br#   

  • Received:2022-05-30 Revised:2022-10-11 Online:2023-08-28 Published:2023-08-24

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

关键词: 正交时频空, 信道估计, 参考信号

Abstract: 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.

Key words: orthogonal time frequency space , channel estimation, reference signal

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