Researching on the Deterministic Channel Models for Urban Microcells Considering Diffraction Effects

Deterministic channel models, such as the three-dimensional (3D) ray launching method, can yield wireless parameters. In non-line-of-sight (NLOS) propagation, outdoor 3D method that considers diffraction effects is more accurate than one does not. While considering effect, obtaining point challenging. This paper proposed a for determining diffracted rays using receiving sphere in launching. The determined shortest distance between two straight lines, and signal loss from transmitting to antennas obtained. Furthermore, experiments on millimeter wave microcell scenario were performed. test results of parameters compared with theoretical calculations. obtained via only specular reflection direct agree experimental line-of-sight (LOS); furthermore, they generate larger errors NLOS. ray, reflected rays, both LOS Therefore, effect improve prediction accuracy microcell.