城市轨道交通车地通信容量分析  

Analysis on Capacity of Urban Rail Transit Train-wayside Communication

作　　者：蒋海林[1] 王洪伟[2] 郜春海[1] 唐涛[2] 

机构地区：[1]北京交通大学轨道交通运行控制系统国家工程研究中心,北京100044 [2]北京交通大学轨道交通控制与安全国家重点实验室,北京100044

出　　处：《铁道学报》2014年第8期44-48,共5页Journal of the China Railway Society

基　　金：国家自然科学基金(61132003);北京市科技计划课题(D13110000 4113002)

摘　　要：在目前的城市轨道交通车地通信系统中,通常存在漏泄波导与无线自由波两种传输方式。本文介绍这两种不同的车地通信方式,分析漏泄波导的信道模型,并指出其信道模型近似于高斯信道。根据城市轨道交通车地通信的高架环境,研究车地无线自由波通信存在强烈直射径的情况下,2×2天线MIMO系统的信道容量及天线间距,得出最佳的天线间距及配置方案。将此MIMO系统的信道容量与漏泄波导的信道容量进行比较,结果表明MIMO系统的信道容量优于漏泄波导信道。In current train-wayside communication systems applied in urban rail transit ,there exist two propaga-tion mediums ,i .e .,the leaky waveguides and wireless free waves .In this paper ,the two different communica-tion modes were described .The channel model of leaky waveguids was analyzed and shown to be approximate to the Gaussian channel .The channel capacity of 2 ×2 MIMO antennas with LOS components in the elevated rail environment was studied and the optimal antenna spacing distances were calculated according to theoretical derivation .At last the channel capacities of the two propagation mediums were compared .The results show that the channel capacity of 2 ＆#215; 2 MIMO is better than that of leaky waveguides .

关 键 词：城市轨道交通 漏泄波导 MIMO 信道容量 

分 类 号：U285[交通运输工程—交通信息工程及控制]