A ray tracing technique to predict path loss and delay spread inside buildings

A ray tracing technique for predicting path loss and delay spread in buildings is described. A novel approach is used to determine the ray directions from the source in three dimensions. Line-of-sight, specular, and nonspecular transmissions and reflections are included in the propagation model. This method shows that accurate impulse response, path loss, and delay spread prediction in buildings is possible using site-specific information, although modeling refinements are still needed. With such a propagation prediction tool, personal communications systems (PCSs) could be designed and installed more rapidly and economically than if measurements were required for each building.<
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