高速铁路场景大尺度传播模型与时频色散特性研究

摘要

随着高速铁路的快速发展,未来高速铁路无线通信系统要求同时支持列车控制、面向运行安全的在途检测数据传输以及旅客信息服务.无线信道是无线通信系统设计的基础,准确认知无线信道的传播特性是设计无线通信系统的前提条件.然而,现有高速铁路宽带信道传播特性的研究存在一定空白,无法为下一代高速铁路无线通信系统的设计提供足够参考.本文基于标准信道探测仪获取的测量数据,研究高速铁路信道的大尺度和小尺度衰落特性.统计路径损耗和阴影衰落参数,建立高速铁路典型场景的大尺度传播模型.根据提取的多径时延、多普勒和角度相关参数,探讨高架桥和U形槽场景的信道时间色散、频率色散以及空间色散特性.%With the rapid development of high-speed railway, future high-speed railway wireless communication systems aim to simultaneously achieve the train control, onboard data transmission surveillance for the safety of railway operation and passenger information services.As radio channel is the basis for the design of a wireless communication system, accurate knowledge of radio channel characteristics is a precondition for the design of the system.However, existing researches on high-speed railway broadband channel characteristics cannot provide sufficient reference for the design of next-generation high-speed railway wireless communication systems.Based on channel measurement data collected by a standard channel sounder, this paper investigated large-scale and small-scale fading characteristics of high-speed railway channels.A large-scale propagation model covering path loss and shadow fading parameters for typical scenarios of high speed railway was established.According to extracted multipath delay, Doppler and angle parameters, the channel time dispersion, frequency dispersion and space dispersion in viaduct and U-shape cutting scenarios were characterized.