基于WCDMA的高铁宽带无线信道测量方法研究

Research on Broadband Wireless Channel Sounding Method for High-speed Railway Based on WCDMA

随着高速铁路的发展,高速铁路车地间的通信数据越来越多,因此迫切需要建立新一代高速铁路宽带无线接入系统。信道特性是无线通信系统设计的基础,传统无线通信系统的信道测量方法很难或不适合用于高铁场景下的信道测量。本文研究一种基于现有蜂窝网络WCDMA的高铁宽带无线信道在途测量方法,并以Sora(Soft Radio)软件无线电平台为基础,通过应用开发与硬件扩展,改制了一种低成本、便携式信道测量仪MSounder(Mobile Sounder)。通过射频矢量信号发生器、信道衰落模块和MSounder搭建的无线信道测量半实物仿真平台进行校准测试,测试结果与预设信道模型相匹配。该方法可用于高铁无线信道的实际测量与模型建立。

Along with fast development of high-speed railways（HSR）,an increasing number of wireless communication data need to be transmitted between train and ground.Therefore,it is critical to build a novel broadband wireless access system for high-speed railways.The wireless channel characteristics are the basis of design of the communication system,however,classical channel sounding methods are difficult and unsuitable to be used for high-speed railway scenarios.In this paper,we researched a novel method of broadband wireless channel sounding based on WCDMA,and developed a low cost,high efficiency,portable channel sounder based on software defined radio platform named Sora（Soft Radio）.The verification system for wireless channel sounding was built by the vector signal generator,channel fading module and channel sounder.The experimental results provide a particularly good match to the configured fading channels.Hence,this measurement method can be used to gather the radio characteristics,and to establish the channel models of the various environments for HSR.