Semi-Deterministic Radio Channel Modelling Based on Graph Theory and Ray-Tracing

Graph theory channel modelling is an efficient approach to simulate multipath radio propagation including the reverberation effect of electromagnetic waves. In this contribution, without modifying the modelling framework, we proposed a semi-deterministic channel modelling approach by associating the scatterers with realistic environment objects, and by calculating the coefficients of the propagation paths on the base of a physically sound and proven diffuse scattering theory. The diffuse multipath components are then combined with the specular components simulated by ray-tracing to obtain a complete channel representation. The proposed method is evaluated in two reference scenarios at 3.8 and 60 GHz respectively by comparing the simulated channel characteristics with channel measurement data. Results show that the proposed method can accurately predict the channel characteristics in both the delay domain and the angular domain. The proposed approach is appropriate to model multipath propagation in confined indoor or dense-urban environment at millimeter-wave frequencies and above, where reverberation and rough-surface scattering can be important phenomena.