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1.引言目前各运营商已经建立高铁移动通信网络。随着TD-LTE技术的发展,TD-LTE高铁网络的建设再次成为各运营商关注的重点。2.高铁场景覆盖特点2.1多普勒频移明显高铁覆盖场景相较于普通覆盖场景,主要在于高速移动环境下的多普勒效应。无线信号传播过程中有各种反射、折射等,到达接收机的是很多个信号的叠加,每个到达信号分量的多普勒频移
1. Introduction At present, all operators have established HSR mobile communication networks. With the development of TD-LTE technology, the construction of TD-LTE high-speed rail network once again becomes the focus of all operators. 2. High-speed Rail Scene Coverage Features 2.1 Doppler shift significantly High-speed rail coverage scenarios Compared with the normal coverage scenarios, mainly in the Doppler effect of high-speed mobile environment. There are a variety of reflections, refractions, etc. in the process of wireless signal propagation. The arrival of the receiver is the superposition of many signals, the Doppler shift of each arriving signal component