Efficient Preprocessed Ray Tracing for 5G Mobile Transmitter Scenarios in Urban Microcellular Environments

Abstract

There has been a great deal of interest in radio channel modeling for upcoming vehicular and device-to-device 5G applications. Site-specific models for such mobile transmitter scenarios become time-consuming as the visibility computations need to be independently performed for each transmitter location. This paper presents an efficient ray-tracing algorithm for a mobile transmitter radiating in an urban environment. The model presented uses a precomputed database of intravisibility of walls and edges in the environment. A visibility table that contains a list of walls and edges visible to multiple transmitters along a linear trajectory is computed for the given order of ray interaction. The walls and edges visible at a given location along the transmitter route are then readily determined using the visibility table thereby accelerating the ray-tracing algorithm. The validation results show considerable time-saving over unaccelerated ray tracing.