移动通信中多重建筑物的遮挡损耗

用Uniform Geometrical Theory of Diffraction（UTD)分析了等高度等间距的建筑物对移动通信中移动台接收信号的影响，给出了易于计算的UTD拟合表达式，计算表明，此时Hata模型、COST231模型的计算结果和UTD的计算结果是较为接近的，但要精确地比较各场点的传播损耗只能用UTD按照实际的不等高度，不等间距的建筑物分布来计算，结果表明，当移动台前一幢建筑物的直接路径被阻挡时，UTD方法能较确定的反映此时的传播损耗。

The Shadowed Losses due to Multiple Buildings in Mobile Communication

By using Uniform Geometrical Theory of Diffraction (UTD),analysis of the influences of the multiple buildings,with equal height on the received signal of the mobile station is presented. A fitting equation of UTD is also given in order to simplify the applications. Comparisons show that the calculated results for COST231 model,Hata model and UTD are approximately the same. However in order to calculate the propagation loss precisely,the UTD method,which can be applied in the environment of the buildings with unequal height,should be used. Especially UTD method can show the shadowed loss of the building,as an obstacle in front of the mobile station.