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Capacity comparison of CDMA and FDMA/TDMA for a LEO satellite system

The system capacity determined by the outage probability of a multi-beam LEO system with CDMA and FDMA/TDMA is analyzed. In the case of CDMA, all possible multiple access interference is taken into account by a comprehensive interference analysis model including the effects of channel fading and sha...

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Bibliographic Details
Main Authors: Hongyi Fu, Guoan Bi, Arichandran, K.
Format: Conference Proceeding
Language:English
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Summary:The system capacity determined by the outage probability of a multi-beam LEO system with CDMA and FDMA/TDMA is analyzed. In the case of CDMA, all possible multiple access interference is taken into account by a comprehensive interference analysis model including the effects of channel fading and shadowing, power control, practical spot beam antenna gains and imperfect equalization of the antenna pattern across a cell region. The results indicate that in LEO systems the CDMA capacity is significantly reduced because of the power control imperfections and the fact that multiple access interference is much more severe than that in terrestrial systems. A comparison with FDMA/TDMA shows that the capacity of an FDMA/TDMA system is comparable to a CDMA one for the LEO satellite systems.
DOI:10.1109/ICC.1999.765441