A NOVEL PROPAGATION MODELING FOR MICROCELLULAR COMMUNICATIONS IN URBAN ENVIRONMENTS

A novel method for microcellular communications to predict propagation characteristics is presented in this paper, It takes into account mul tiple reflections among walls, ground, vehicles, as well as the transm ission/reflection due to groups of trees, Although these are three-dim ensional (3-D) problems, we can combine two dimensional (2-D) ray trac ing and simple 3-D geometric considerations to solve them in a very ef ficient way. We have investigated the propagation loss versus size, nu mber, and locations of vehicles and groups of trees on a safe island, our results show that the radio wave propagation exhibits severe fast fading, attenuation, and blockage due to reflection, transmission, and shadowing, respectively.