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This paper reports experimental results on cochannel interference during rain, derived from measurements of simultaneous and copolar rain attenuations, in the 20 GHz band, in two convergent slant paths to fixed receivers at Spino d'Adda (Northern Italy), from the geostationary satellites Olympus (19OW) and Italsat (13"E). The results show that during rain the interference can be larger than that in clear sky, with probability 0.5 and that, in this case, the interfering level / = A , -A,, (dB), i.e. the difference between the simultaneous rain attenuations (dB) in the interfered path, A, (dB), and in the interfering path, A, (dB), increases as the system power margin increases. For system design, the paper reports the cumulative distributions of I , conditioned to the maximum value of the attenuation not exceeded (i.e. system power margin) in the interfered link. It is shown how the results could be used in systems with regenerative or transparent transponders on board.

Cochannel Interference in Satellite Communication Systems Derived from Rain Attenuation Measurements at 20 GHz