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Transmission Capacity Degradation due to Traffic Changes in Interactive Multimedia Satellite Communications

This paper presents a study on transmission capacity degradation due to traffic distribution changes in an interactive multimedia multibeam satellite communications system (IMMSC). An analytical model for the return link in which the bandwidth is shared with multiple beams and beam couplings exist is discussed and using this model, the effects of adjacent beams and the relationship between traffic distribution and change in transmission linearity are investigated. It is found that the effects of undesired signals leaked from adjacent beams, which up to now have been considered small, cannot be neglected for the return link. They depend on the traffic distribution and cause linearity degradation and a decrease in maximum transmission capacity. Based on the study, effective methods are also presented for increasing the return link access capacity.