Analysis of the interference due to differential rain attenuation induced by an adjacent path on a double‐site diversity system using frequency reuse

Abstract

Abstract. One of the main propagation effects on interference between adjacent Earth-space paths is considered to be the differential rain attenuation. In the present paper a method to predict differential rain attenuation statistics, valid for single-site communication systems, is extended to include double-site interfered systems operating under the dual-polarization mode. The extended procedure is again based on a model of convective rain cells as well on the lognormal model for point rainfall rate statistics. Numerical results are presented referring to realistic diversity systems operating under the hypothesis of using both single and dual polarization and suffering from differential rain attenuation. Some very useful conclusions are deduced on the reliable and economic design of future communication systems where orbital and frequency congestion are quite expectable.

Ice Crystals and Raindrop Canting Angle Affecting the Interference Performance of a Double-Site Diversity Earth-Space System Employing Frequency Re-Use

“…The single and joint exceedance probabilities encountered in (2)-(5) can further be calculated by following similar steps as those reported in [4], where the same problem has been examined but not considering the ice crystals and raindrop canting angle effects.…”

“…The effective average lengths of the earth-Space paths are given in terms of the effective rain height H, the average height above sea level of the earth-station H 0 and the elevation angles [4]. c) The specific rain attenuation (in dB/km) is given by…”

“…To proceed further, some fundamental assumptions, reported also elsewhere [1][2][3][4], are briefly presented here:…”

“…The proposed methodology is a combination of the previous models [4,5] and is applicable to any location provided that the convective raincells for the spatial structure and the lognormality for point rainfall statistics could be adopted.…”

“…The latter source of interference concerns, of course, satellite systems using the frequency sharing technique. In a series of publications [1][2][3][4] the prediction of the degradation of the total carrier-to-interference statistics, under raining conditions, has been treated. The analysis is general including the case of interfered single-site systems as well as systems operating under the double site diversity protection scheme.…”