A propagation prediction tool for urban mobile radio systems

This paper presents a propagation prediction toot (PPT), developed mainly t o facilitate the path loss computation in urban environments, Based on anal ytical methods-geometrical optics (GOs), physical optics (POs), and uniform theory of diffraction (UTD)-the tool incorporates an empirical factor, the path loss factor n, used in all unobstructed paths between two points to r emedy the deficiencies of the analytical models, Ray tracing techniques wer e used to model the flow of electromagnetic energy from the transmitter to the receiver The received held strength is computed by complex vector addit ion of the fields arriving at the receiver by any of the mechanisms utilize d. Path loss results are given for line-of-sight (LOS) and non-line-of-sigh t (NLOS) cases, indicating the contribution from each mechanism. Finally, c omparisons with measured data for DECT systems in urban sites are presented , in order to validate the prediction tool.