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IEEE Transactions on Antennas and Propagation
Volume 47 Number 1, January 1999

Analysis of the Interference Due to Differential Rain Attenuation Induced by an Adjacent Path on a Triple-Site Diversity Earth-Space System

Page 200.

Abstract:

The reliable design of satellite communication systems requires the consideration of interference effects. Interference caused by differential rain attenuation from an adjacent earth-space system is taken under consideration here. In particular, a method to predict rain differential attenuation statistics used for single/double site earth-space systems is extended to include triple-site diversity ones. The modified method is again based on a model of convective rain cells as well as on the lognormal assumption for the point rainfall rate distribution at the location under consideration. In an analogous fashion with the ({{C}}/{{N}}) ratio, a {{^{_{_{\scriptstyle{\ll}}}}}}({{C}}/{{I}}) diversity gain{{^{_{_{\scriptstyle{\gg}}}}}} is also adopted here and some very useful remarks concerning the effectiveness of the triple-site diversity protection as a countermeasure technique are deduced. 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 satellites operating under permitted interference levels.

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