Access Technologies White Papers
Multiple Acces in Mobile Satellite Communication
Overview For some time already a major effort is underway to deploy three types of modulation/multiple access systems for mobile satellite communication, namely FDMA, TDMA/FDMA and CDMA. This paper presents a comparison between the three mobile satellite multiple access systems. The mobile satellites under consideration use multiple-beam antennas and employ frequency reuse of the allocated L-band frequency spectrum. It appears that despite the fact that FDMA and FDMA/TDMA are orthogonal systems, they nevertheless suffer from bandwidth limitations and sensitivity to interbeam interference in L-band. CDMA is better at absorbing Doppler and multipath effects, and it permits higher rate coding, but it suffers from self jamming and from bandwidth constraints in the feederlink. In general all three multiple access systems show similar performance. However, at the chosen design point for aggregate EIRP, number of beams, and allocated bandwidth, FDMA provides still the highest system channel capacity.
| Publisher | Elektro Online | File Format | HTML |
|---|---|---|---|
| Date Published | August 1999 | Downloads | 60 |
| Format | White Papers | ||
| Topics | |||
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