Improvement of the computation efficiency for a ray-launching model

An enhanced ray-launching model is proposed to improve the efficiency and the speed of computation of propagation characteristics. To obtain the improvements, two methods are used: the effective-propagation-area method and the dominant-corner extraction method. The effective-propagation-area method is a method which restricts the propagation region to be considered when the wave propagation characteristics are predicted. The dominant corner-extraction method is used to diminish the amount of the diffraction ray computation by considering only the particular building corners which have a significant influence on the received power. The received power and the RMS delay spread are predicted for microcellular environments using the proposed model and compared with the results of the general ray-launching model. It is observed from the prediction results that the proposed model shows the considerable improvement in computation speed, and good agreement with the general ray-launching model.