Performance analysis and capacity issue of IDMA-based satellite systems under imperfect power control

Considering the advantage of interleave division multiple access (IDMA) technique and the existing technical bottlenecks in satellite systems, IDMA is introduced into satellite communication networks. In multi-beam IDMA satellite systems, combined with unique SINR evolution technology, the system interference value can be accurately estimated, and system capacity can be accurately calculated considering the multi-user detection (MUD). Another important issue in applying IDMA scheme is that the received mobile user power levels at satellite are unequal. Due to inherent long propagation delay, the power fluctuations in mobile satellite channels cannot be perfectly compensated by power control techniques. Consequently, the capacity of the system is reduced, compared to system with perfect power control (PPC). This paper derives the signal power to interference and noise ratio (SINR) of multi-beam mobile satellite system and studies the capacity of IDMA in the presence of power control error. What's more, the system capacity is evaluated by outage probability and power control error (PCE).