IMPACT OF TERRAIN AWARE INTERFERENCE MODELING ON THE THROUGHPUT OF COGNITIVE Ka-BAND SATELLITE SYSTEMS

The impact of including the diffraction loss in the interference modeling on the system throughput is assessed in the context of cognitive Ka-band satellite systems. In particular, we focus on the cognitive satellite downlink, where Geostationary (GEO) Fixed Satellite Service (FSS) terminals receive interference from the incumbent Fixed-Service (FS) microwave links. We present numerical results where we analyze the Signal-to-Interference plus Noise Ratio (SINR) and the throughput of the satellite terminals considering free-space propagation only and the free-space propagation plus the diffraction caused by the terrain data according to ITUR P.526-13. We also compare the results achieved with and without smart resource allocation. The inclusion of the diffraction loss is shown to attenuate the interference caused by the terrestrial system and thus, to improve the SINR of the satellite terminals. However, its effect on the final throughput has little relevance due to the significant number of available and unaffected carriers.