Efficiency Comparison Between CDMA and PRMA-HS in Low Earth Orbit Mobile Satellite Systems
This paper deals with the spectral efficiency comparison between Code Division Multiple Access (CDMA) and a modified version of Packet Reservation Multiple Access (PRMA), called PRMA with Hindering States (PRMA-HS), in a Low Earth Orbit — Mobile Satellite System (LEO-MSS). The same Rice channel model, available bandwidth, source and channel coding, energy per bit, satellite antenna system and satellite constellation altitude have been assumed in both cases. A performance analysis of both CDMA and PRMA-HS has permitted to evaluate their spectral efficiency. We have obtained that PRMA-HS has not a satisfactory performance when the fading margin is low, especially if also the Rice factor is low. Whereas CDMA maintains a certain capacity also for low fading margin values.
KeywordsSpectral Efficiency Code Division Multiple Access Universal Mobile Telecommunication System Universal Mobile Telecommunication System Packet Loss Probability
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