高速移动下轨道交通无线通信系统的多普勒效应  

Testing Method of Doppler Effect in High-speed Railway Wireless Communication System

作　　者：叶娇[1] 覃添翼[1] 李亚斌[1] 

机构地区：[1]上海大学特种光纤与光接入网重点实验室,上海助理工程师200072

出　　处：《城市轨道交通研究》2013年第2期34-37,共4页Urban Mass Transit

基　　金：国家自然科学基金项目(61132003);上海市重点学科项目(S30108)

摘　　要：随着城市轨道交通无线通信技术的发展,现有的测试仪器正面临着全面测试新需求的实时挑战。针对国内城市轨道交通无线局域网(WLAN)设备测试平台中多普勒效应测试的需求,以及信道仿真器带宽小且时延大的缺陷,提出了多普勒效应实时信道仿真的新方法。利用双路多普勒信道仿真模块构建了测试平台,并配合路径损耗电路实现WLAN系统在高速移动下的性能综合测试。通过实测得到结论:相同信噪比下,随着速度增加吞吐量略有下降;随着信噪比降低,吞吐量下降幅度越大。With the development of railway transit wireless communication technology, the existing test platforms are facing challenges of real- time comprehensive experiment. Aiming at the demand for Doppler Effect testing in domes- tic railway transit WLAN equipment, the flaw of small bandwidth and large delay of the channel emulator, a novel approach for the real- time simulation of Doppler Effect channel is proposed. The Dual - Doppler channel emulators are used to build a testing platform, and then combined with the path loss circuit to implement the comprehensive performance test of WLAN system in high - speed environ- ment. The platform provides an integrated solution for sys- tem access test of WLAN system applied in railway transit.

关 键 词：城市轨道交通 无线局域网 多普勒频移 频谱搬移 

分 类 号：U239.5[交通运输工程—道路与铁道工程] U285