城市微区角度色散移动信道特性的建模与仿真

城市微蜂窝数字移动通信网无线电信道的一个非常重要的传播特征就是多径传播环境结构所造成的电波入射角度色散。这种现象是移动台在随机游走过程中，由于周围随机分布的复杂建筑结构和随机变化的人为及自然环境使得经过等效反射路径到达接收机的电波入射角度随着移动速度而产生的其分布不断变化的任意扩散结果。因此角度色散信道是在多普勒效应的作用下伴随着频率色散而出现的，而对其信道特性进行研究的关键就是了解各种传播环境下的电波入射角分布结构。本文在研究角度色散信道传播特性理论模型的基础上，构造了一种用代表其信道物理量的特征参数表示任意传播信道电波入射角分布的一般结构模型，并根据这种入射角分布模型来研究和分析在不同城市环境中移动无线电多径色散信道的信号传播特性，最后通过计算机模拟仿真进一步分析了不同的电波入射角角度分布对信道传播特性的影响。

Modelling and Simulating Performance of Angle-Dispersive Mobile Channel in Urban Microcell

A very important propagation characteristic of the radio channel in urban microcellular digital mobile communication network is wave incident angle-dispersion resulted from the structure of multipath propagation environment. This is the arbitrary spreading result of incident angle of wave arrived at mobile receiver through equivalent reflecting path from arounding arbitrary distributed building structures and varying environment which distribution varies with mobile speed of random walk. For this reason, the angle dispersive channel appears with frequency dispersion due to Doppler effect, so the key of researching the channel performance is to study the distribution structure of incident angle in various propagation environment. Based on researching propagation property theoretical model of angle-dispersive channel, the paper has set up a universal structure model of arbitrary incident angle distribution in propagation channel expressed by characteristic parameters which represented the channel physics, researched and analyzed the signal propagation properties of mobile radio multipath dispersive channel in different urban environment with the help of this incident angle distribution model, finally making use of computer simulation, analyzed the effect of different radio wave incident-angle distributions on the propagation performance of the channel.