高铁5G移动通信系统Multi-TRP上行信道估计及性能研究  

Study on Multi-TRP Uplink Channel Estimation and Performance of 5G Mobile Communication System in High-speed Railway

作　　者：陆志伟 王海龙 王东明[1] 宋铁成[1] 陈建平 Lu Zhiwei;Wang Hailong;Wang Dongming;Song Tiecheng;Chen Jianping

机构地区：[1]东南大学,南京211189 [2]南京泰通科技股份有限公司,南京210039

出　　处：《铁道通信信号》2021年第10期59-66,共8页Railway Signalling & Communication

基　　金：国家自然科学基金,认知车联网关键技术研究,61771126;江苏省重点研发计划,车联异构网高效传输技术及安全系统研发,BE2018108。

摘　　要：Multi-TRP是5G NR的R16增强高速移动场景下的关键技术,在高速铁路中,其信道估计和检测面临更大的挑战。本文对列车高速移动场景下应用Multi-TRP的上行信道估计及性能进行深入研究。考虑到终端到多个TRP的时延和多普勒频偏不同,提出信道估计的时延补偿和多普勒补偿方法。首先,对不同TRP的接收信号分别进行时延和多普勒频偏的补偿;其次,对解调后的信号进行时频域信道估计;最后,采用信道估计矩阵对解调后的信号进行符号检测,以恢复发射信号。同时,从时频域信道估计性能和系统性能2个方面对Multi-TRP系统的上行信道进行性能评估。仿真结果表明,本文所采用的方法显著地改善了信道估计的精度、系统误码性能和频谱效率。Multi-TRP is a key technology of 5G NR R16 enhanced high-speed mobile scenarios and channel estimation and detection of Multi-TRP are facing greater challenges in high-speed railway. In this paper, the estimation and performance of the uplink channel of multi-TRP in the scenario of train running at high speed are studied in depth. Considering the differences of delay and Doppler frequency offset between the terminal and multiple TRPS, delay compensation and Doppler compensation methods for channel estimation are proposed. Firstly, time delay and Doppler frequency offset are compensated for the received signals from different TRPs. Secondly, channel estimation in time and frequency domain is carried out for the demodulated signal. Finally, the symbol detection of demodulated signal is carried out using channel estimation matrix to recover the transmitted signal. At the same time, the performance of the uplink channel of the multi-TRP system is evaluated from two aspects of channel estimation performance in time-frequency domain and system performance. Simulation results show that the proposed method can significantly improve the accuracy of channel estimation, error code performance and spectral efficiency of the system.

关 键 词：5G NR移动通信系统 Multi-TRP技术 信道估计 时延补偿 多普勒频偏 信道检测 误码率 频谱效率 

分 类 号：U285[交通运输工程—交通信息工程及控制]