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Downlink capacity analysis for DS-CDMA satellite systems accounting for on-board power constraints

This paper presents a novel methodology for the analysis of the downlink of a DS-CDMA mobile satellite system which allows one to evaluate the impact of the power limitations expected in a satellite-based access in terms of capacity. The methodology has been applied to compare an optimum power control, providing BER-driven thresholds, with a pure signal-to-interference ratio (SIR)-based strategy. Relationships among service BER, channel states statistic and expected dynamic range of the outer-loop process are derived. Concluding remarks on the power management policy, and its impact on the overall capacity, are given.