高速铁路GSM-R系统无线信道特性仿真  

Simulation on the Characteristics of the Wireless Channel for High-Speed Railway GSM-R System

作　　者：熊磊[1] 路晓彤 钟章队[1] 艾渤[1] 朱明伟[1] 

机构地区：[1]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 [2]铁道部运输局,北京100844 [3]铁道部C3技术攻关组,北京100844

出　　处：《中国铁道科学》2010年第5期84-89,共6页China Railway Science

基　　金：国家自然科学基金资助项目(60830001);教育部长江学者和创新团队发展计划项目(IRT0949);新世纪优秀人才支持计划项目(NCET-09-0206);轨道交通控制与安全国家重点实验室(北京交通大学)自主研究课题项目(RCS2008ZZ006;RCS2008ZT005)

摘　　要：根据无线信道特性和高速铁路场景,建立高速铁路GSM-R系统无线信道小尺度衰落模型。从时域和频域2个方面,定量分析时延扩展、相干带宽、电平通过率和相干时间等无线信道参数。利用搭建的高速铁路GSM-R系统半实物仿真平台,对高速铁路GSM-R系统的性能进行仿真测试。计算机仿真和半实物仿真结果表明:列车运行速度的提高会造成通信质量不同程度的下降;列车运行速度为350 km.h-1时的下行链路通信质量与80 km.h-1时相比有一定程度的下降,但可以满足GSM-R系统的要求,通信质量是有保障的;列车运行速度达到500 km.h-1后,通信质量发生明显的恶化;优化接收机设计是解决通信质量恶化问题的关键。According to the characteristics of the wireless channel and the scenarios of high-speed railway,this paper introduces the methods of small-scale fading modeling with various scenarios for the wireless channel of high-speed railway GSM-R system.With the methods for modeling,the parameters of high-speed railway small-scale fading channels in time domain and frequency domain,such as the delay spread,the coherence bandwidth,the level crossing rate and the coherence time,are quantitatively discussed with simulation and computing.The Hard-In-the-Loop（HIL） simulation test bench for high-speed railway GSM-R communications system is built,and the performance of high-speed GSM-R system is evaluated.The simulation and experimental results show that the communication quality will decline at different degrees with the increase of the running speed.The communication quality in the downlink at the train speed of 350 km·h^-1 is worse than that at 80 km·h^-1 to a certain extent.Whereas,it still can meet the requirement of GSM-R system,which indicates that the communication quality of high-speed railway is guaranteed.However,the communication quality will deteriorate seriously at 500 km·h^-1.To improve the design of the receiver is the key to solving the problem of communication quality deterioration.

关 键 词：GSM-R 无线信道 小尺度衰落模型 半实物仿真 高速铁路 

分 类 号：U285.21[交通运输工程—交通信息工程及控制]