Comparison of Multiple Access Schemes in Multibeam Non-GEO Satellite Communication Systems

Naoki ICHIKAWA  Masaaki KATAYAMA  Hiraku OKADA  Takaya YAMAZATO  Akira OGAWA  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.2   pp.785-791
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Satellite and Space Communications
multibeam satellite,  multiple access,  capacity,  interference,  

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This paper describes an analytical method to estimate the amount of interference in multibeam non-geostationary satellite systems. The performance of CDMA is compared with that of FDMA (or TDMA) by employing the maximum acceptable number of users per cell in uplink as a measure. Numerical examples shows that the maximum acceptable number of users in FDMA (or TDMA) systems varies according to the altitude of the satellites, while the performance is insensitive to the altitude in CDMA systems. Then, it is found that the superior multiple access scheme depends on the altitude of the satellite.