基于FDD的5G-R系统信道互易性及方向信息估计方法研究  

Research on Estimation Method of Channel Reciprocity and Channel Direction Information of 5G-R Systems Based on FDD

作　　者：王琦[1] 钱承晖 王东明[1] 宋铁成[1] 陈建平 Wang Qi;Qian Chenghui;Wang Dongming;Song Tiecheng;Chen Jianping

机构地区：[1]东南大学移动通信国家重点实验室,泰通科技铁路5G移动通信联合研发中心,南京210096 [2]南京泰通科技股份有限公司,南京210039

出　　处：《铁道通信信号》2022年第2期56-62,共7页Railway Signalling & Communication

基　　金：国家自然科学基金(61771126);江苏省重点研发计划(BE2018108)。

摘　　要：由于5G-R专网采用频分双工(FDD)模式,因此多点传输性能的提升依赖于精确的信道状态信息估计,而列车高速移动引入的多普勒效应,使得信道参数的估计更具有挑战性。在FDD模式下,研究了上/下行不同工作频率以及信道老化对上/下行信道互易性的影响,以及基于上行探测信道角度参数的估计方法。仿真结果表明:在远端射频单元与列车垂直夹角较小的情况下信道互易性较好,随着上/下行频率间隔增大或车速增加,其互易性会降低;根据上行探测信道信号,可以获取较为精确的角度和位置信息,为FDD的下行信道预编码计算提供技术支撑。Since the frequency division duplex(FDD)mode is adopted in private 5 G-R network,the performance improvement of multi-point transmission depends on accurate estimation of channel state information.However,the Doppler effect introduced due to high-speed movement of the trains makes the estimation of channel parameters more challenging.In FDD mode,we studied the effects of different operating frequencies and channel aging on the reciprocity of the uplink and downlink channels as well as the estimation method of the angle parameters based on the uplink detection channel and its performance.The simulation results show that when the vertical angle between the remote radio unit(RRU)and the train is small,the channel reciprocity is good,and the reciprocity decreases with the increase of the updownlink frequency interval or the increase of the train speed.According to the uplink detection channel signal,more accurate angle and position information can be obtained,which provides technical support for the downlink channel pre-coding calculation of FDD.

关 键 词：移动通信 铁路5G专网 频分双工 信道互易性 角度估计 预编码 

分 类 号：U285[交通运输工程—交通信息工程及控制]