城轨列车对列车通信的多天线Rake接收技术研究  

Research on Multi-antenna Rake Receiving Technology for Train to Train Communication in Urban Rail Transit System

作　　者：李茂青[1] 郑锋贺 高云波[1] 阳长琼 LI Maoqing;ZHENG Fenghe;GAO Yunbo;YANG Changqiong(School of Automation&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Opto-Electronic Technology and Intelligent Control,Ministry of Education,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]兰州交通大学光电技术与智能控制教育部重点实验室,兰州730070

出　　处：《铁道标准设计》2022年第10期149-155,共7页Railway Standard Design

基　　金：国家自然科学基金项目(61661027);甘肃省科技计划项目(20JR10RA210)。

摘　　要：近年来,列车对列车通信成为一种新兴起的技术,尤其在城轨领域具有迫切需求。但在地铁中,由于空间有限,电磁波传播受多径衰落影响较为严重,直接关系到城轨的运行安全,针对这一问题开展地铁环境列车对列车直接通信的抗多径衰落研究。首先,选择实际隧道环境下合适的通信距离和通信频段;其次,设计了一种使用三天线技术来抗多径衰落的毫米波通信机结构,提出将Pre/Post-Rake技术和多天线合并算法结合起来的方案,以降低误码率达到铁路通信标准;最后,利用毫米波路径损耗模型对改进Rake接收机的误码特性进行了仿真验证。仿真结果证明,此Rake接收机可有效抵抗多径衰落影响,提高城轨通信的可靠性和安全性。In recent years,train-to-train communication has become an emerging technology and especially,an urgent need in the field of urban rail transit.But in the subway,due to the limited space,the electromagnetic wave propagation is seriously affected by the multipath fading,which is directly related to the operation safety of the urban rail transit.To solve this problem,this paper conducts the research on mitigating the multipath fading of direct train-to-train communication under the subway environment.Firstly,the appropriate communication distance and frequency band are selected to adapt to the actual tunnel environment.Secondly,a millimeter-wave communication device structure that uses three-antenna technology to mitigate multipath fading is designed.Then,the combination of Pre/Post-Rake technology and multi-antenna algorithm is proposed to reduce the bit error rate to meet the railway communication standard.Finally,the millimeter-wave path loss model is used to simulate and verify the error characteristics of the improved rake receiver.The simulation results show that the rake receiver can effectively mitigate the influence of multipath fading and improve the reliability and security of urban rail communication.

关 键 词：列车对列车通信 毫米波 多天线 抗多径衰落 RAKE接收技术 

分 类 号：TN928[电子电信—通信与信息系统] U285.21[电子电信—信息与通信工程]