Sy. Tan et Hs. Tan, IMPROVED 3-DIMENSIONAL RAY-TRACING TECHNIQUE FOR MICROCELLULAR PROPAGATION MODELS, Electronics Letters, 31(17), 1995, pp. 1503-1505
An improved three-dimensional ray tracing technique based on multiple-
image and ray launching concepts is presented. The technique yields la
rge improvements in terms of accuracy, computing efficiency and memory
requirements compared with the conventional 'brute force' ray tracing
method.