Impact of the Introduction of Diffuse Scattering on Radio Channel Parameters in Urban Environments

The paper presents an implementation of the diffuse scattering within a 3D urban propagation simulation method, based on ray-launching. New contributions representing the diffuse scattering are added to the traditional specular rays, leading to a more realistic model, especially when radio terminals are in the close vicinity of buildings. The impact of this enrichment on the simulated wideband propagation channel is analysed in this paper. In particular, it is found that the wideband signal predicted at street-level is strongly modified when taking into account the diffuse scattering phenomenon. The implemented method is illustrated by comparing simulations taking into account or not the diffuse scattering. Key radio channel parameters are analysed: power- delay profile and angular profile.