论文部分内容阅读
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。
One of the most important propagation characteristics of the radio channel of urban microcellular digital mobile communication network is the dispersion of incident angles caused by the multipath propagation environment. This phenomenon is the mobile station in the random walk in the process, due to the surrounding random distribution of complex building structures and random changes in man-made and natural environment so that the path through the equivalent reflection path to the receiver of the incident angle of the wave with the moving speed of its Distribution of ever-changing diffusion results. As a result, the angle dispersion channel appears along with the frequency dispersion under the Doppler effect. The key point to study its channel characteristics is to understand the structure of the incident angle distribution of radio waves in various propagation environments. Based on the study of the theoretical model of dispersive channel propagation, a general structural model of the incident angle distribution of arbitrary propagating channel is presented by using the characteristic parameters that represent the channel physical quantities. According to the incident angle distribution model, The signal propagation characteristics of the mobile radio multi-path dispersion channel in different urban environments are analyzed. At last, the influence of different angles of incidence angle of the radio waves on the channel propagation characteristics is further analyzed by computer simulation.