高速铁路多径散射环境下电波径数分布特点探讨

Discussing of the Path-number Distribution with High-speed Railway Multi-path Scattering Environment

根据高速铁路环境下无线电波传播的特点,讨论了电波径数的分层分布,从时间上考虑主要由区域有效散射体引起的相对时延径数分布,指出其与有限状态空间的线性生灭过程的不同点;从空间上考虑主要有本地有效散射体引起的空间径数分布,指出其服从有限状态空间的线性生灭过程;分别给出了数学模型;指出径数到达时间间隔服从指数分布,分布参数与速度成正比,表现为电波径数变化的频率和持续时间加快。

Based on the characteristics of radio propagation with highspeed railway environment, from time the wave pathnumber divide layer distribution is discussed,the relative delaytime numberpath distribution resulted from the regional effective scattering body is especially considered and the difference from the linear birthanddeath process in finite state space is pointed out;from space the pathnumber resulted from the local effective scattering body is especially considered,and that its distribution obeys the linear birthanddeath process in finite state space;the models are presented; that the sequence of arrival time obeys index distribution is pointed out,and its distribution parameter in positive proportion to speed is illuminated and that the frequency and duration time changed are accelerated is shown.