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本文根据移动通信中电波传播的基本特点,推导出以地形特征及传播特征为参数的多径传播时延的分布密度。这一分布密度与目前公认的指数分布不同,但将它作为一种特殊情况包括在内。文中给出了时延服从指数分布的条件,并较圆满地解释了试验中观察到的一些现象。最后讨论了分布密度公式中两个参数的物理意义。
In this paper, according to the basic characteristics of radio wave propagation in mobile communications, the distribution density of multipath propagation delay is deduced based on topographic characteristics and propagation characteristics. This distribution density is different from the currently accepted index distribution, but it is included as a special case. In this paper, we give the conditions of time-delay obeying exponential distribution and explain some phenomena observed in the experiment more satisfactorily. Finally, the physical meaning of the two parameters in the distribution density formula is discussed.