2.35 GHz 高速铁路宽带无线信道时间色散分析  

Analysis on Time Dispersion of Broadband Wireless Channel for High-speed Railway at 2.35 GHz

作　　者：邱佳慧[1] 陶成[1] 刘留[1] 谈振辉[1] 

机构地区：[1]北京交通大学宽带无线移动通信研究所,北京100044

出　　处：《铁道学报》2014年第8期38-43,共6页Journal of the China Railway Society

基　　金：国家自然科学基金(61371070,61102050);北京市自然科学基金(4122061);中央高校基本科研业务费专项资金(2011YJS013)

摘　　要：基于高铁场景的信道测量与分析,有利于宽带无线通信系统在高铁上的实现和优化。本文以速度为200km/h的郑西高铁高架桥环境下宽带无线接入为应用背景,对2.35GHz频点下50MHz带宽的无线信道进行测量。基于实测数据,将列车穿越发射机的信道变化过程划分为4个区域(RA,TA,CA,AA),并从频域和时域两个角度对不同区域中的高铁无线信道特性进行分析。讨论频域的相关散射特性,研究时域的时延扩展特性,阐述在不同区域中信道特性变化的原因,验证了通过频域相关和rms时延扩展两种方法得到的相干带宽的一致性。Channel measurement and modeling analysis made for high-speed railways （HSRs） is a major prereq-uisite for the broadband wireless communication design and optimization.In this paper ,measurements of 50 M Hz-wide wireless channels were conducted at 2.35GHz on the Zhengzhou-Xian HSR viaduct with the speed of 200 km/h.On the basis of the changes of the measurement data ,the w hole channel changing process in w hich the measured train passed by the transmitter was divided into four areas i.e. ,the remote area（RA） ,toward area （TA） ,close area（CA）and arrival area（AA）.The characteristics of the HSR wireless channels through the a-bove four areas were analyzed from the frequency domain and time domain respectively.The correlated scatter-ing characteristics in the frequency domain and the delay spread characteristics in the time domain were dis-cussed.Reasons for the changes of channels in different areas were interpreted.Finally the correlation band-widths calculated by the frequency correlation and the rms delay spread methods were compared and the consis-tency w as verfied.

关 键 词：高速铁路 宽带信道测量 频域相关性 时域延迟扩展 相干带宽 

分 类 号：U285.2[交通运输工程—交通信息工程及控制]