Carrier to noise plus total interference ratio statistics on a frequency re-use satellite system interfered by an adjacent terrestrial microwave system

Summary form only given. The increasing demand for satellite communication channels is causing system designers to consider orthogonal polarization frequency sharing. For frequencies above 10 GHz, which are of utmost importance in current satellite systems, rain depolarization is a serious problem and may significantly degrade the outage performance of the system. Another source of interference on satellite communication system can arise when an adjacent terrestrial microwave system operates at the same frequency. For this kind of problems, the predictive analysis has been so far devoted to the analysis of noise dominant systems, where carrier to total interference (C/I) is at least 3 dB larger than the carrier to noise ratio (C/N) of the system. Some models have been presented with the prediction of the degradation of the (C/I) ratio under the condition that the rain attenuation A_c of the wanted signal is less than a maximum allowed rain fade level M (in dB). However, for the more general case and particularly for interference dominant systems {(C/I) < (C/N)} the exact estimation of the non-available time requires the calculation of the degradation of the carrier-to-noise plus total interference ratio (CNIDR) under the presence of rain fades. The subject of the present paper is the development of a procedure for the prediction of the (CNIDR) statistics, between a satellite path and an adjacent terrestrial microwave system, assuming the model of convective raincells for the spatial rainfall structure and the lognormal distribution for the point rainfall rate and the specific rain attenuation. The numerical results are concentrated on the analytical examination of the predicted (CNIDR) statistics, towards the more accurate, economic and reliable design of an Earth-space system suffering from differential rain attenuation and rain depolarization