Local access radio interference due to building reflections

A computer simulation for studying the interference effects of building reflections on the system performance of local access radio (LAR) is described. The simulation is based upon geometric optics. Coverage probability, defined as the fraction of subscriber locations that can be served by radio within a given range, is calculated. It is shown that only half of the potential subscriber sites within the range of the node can be served by the node site. Of those, a majority are not limited by self-interference caused by reflections. Most of the strong interferences come from structures near the subscriber. Increasing the node mast height has little effect on the coverage. Changing node antennas from three 120° sectors to six sectors, each covering 60°, does not effect the coverage probability. Coverage can be increased by increasing the subscriber mast height. Up to half of the subscribers not served by a node site may be served by an optimally placed node site using different channel frequencies