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Summary: 1
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This paper deals with the spectral efficiency comparison between &RGH 'LYLVLRQ 0XOWLSOH $FFHVV
(CDMA) and a modified version of 3DFNHW 5HVHUYDWLRQ 0XOWLSOH $FFHVV (PRMA), called 350$
ZLWK +LQGHULQJ 6WDWHV (PRMA-HS), in a /RZ (DUWK 2UELW 0RELOH 6DWHOOLWH 6\VWHP (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.
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The 8QLYHUVDO 0RELOH 7HOHFRPPXQLFDWLRQV 6\VWHPV (UMTS) will encompass a terrestrial cellular
component and a satellite one integrated at the system level. This paper focuses on the
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