Analysis of the interference due to differential pain attenuation induced by an adjacent path on a triple-site diversity earth-space system

The reliable design of satellite communication systems requires the conside ration of interference effects. Interference caused by differential rain at tenuation from an adjacent earth-space system is taken under consideration here. In particular, a method to predict rain differential attenuation stat istics used for single/double site earth-space systems is er;tended to incl ude triple-she diversity ones. The modified method is again based on a mode l of convective rain cells as well as on the lognormal assumption for the p oint rainfall rate distribution at the location under consideration. In an analogous fashion with the (C/N) ratio, a << (C/I) diversity gain >> is als o adopted here and some very useful remarks concerning the effectiveness of the triple-site diversity protection as a countermeasure technique are ded uced. As a general conclusion, it can be stated that the triple-site scheme not only reduce the potential large attenuation margins significantly; but also leads to the establishment of the minimum separation between satellit es operating under permitted interference levels.