Fast 3-D Ray Tracing for the Planning of Microcells by Intelligent Preprocessing of the Data Base

| Deterministic 3-D modelling of wave propagation in urban areas has become a widely discussed technique for the planning of microcells. However, the practical use of these deterministic models has been limited due to their high computational demands. This paper presents a new approach with the aim of combining the accuracy of ray optical models with the short computation times of empirical models. For this purpose a single intelligent preprocessing of the building data base has to be performed. In this preprocessing the mutual visibility conditions between the walls and edges of the buildings are determined and stored. Comparisons with measurements show the gain in computation efficiency as well as the achieved prediction accuracy.