Determination of the most efficient utilization of the geostationary orbit for communication satellites using a system model based on shared channel interference measurements with PSK modulated signals

A systems model was used to determine the shared channel interference of a PSK (phase shift keying) modulated signal by up to four PSK modulated noise signals; the minimum distance at which a maximum allowable interference occurs was found for neighboring communication satellites, working in the same frequency range. The quantitative measure for interference used was the degradation Delta C/N (db) as a function of carrier-to-interferer ratio C/I (db) for certain bit error rates. Results show that the magnitude of occurring degradation is determined in essence by both direct neighbor satellites and that the degradation has a clear threshold value characteristic dependent on C/I or the corresponding angular decoupling lambda of the neighbor satellites.