User capacity of a demand-assigned satellite communication system with a hybrid TD/FDMA uplink and a TDM downlink
Abstract
The advent of processing satellites which perform demodulation and remodulation of received signals has made it practical to consider satellite communication systems in which the uplink and downlink multiplexing/multiple access schemes are different. This paper considers a satellite communication system in which channels are demand-assigned, and in which a hybrid Time Division/Frequency Division Multiple Access approach is employed for the uplink and pure Time Division Multiplexing is employed for the downlink. The user capacity is analyzed in general, and numerical results are given for some specific parameters of interest. Depending on the number of ground terminals in the network, it is found that the user capacity of the system can be limited by either the terminal's channel capacity or the satellite's channel capacity.
- Publication:
-
ICC 1981; International Conference on Communications, Volume 1
- Pub Date:
- 1981
- Bibcode:
- 1981icc.....1....5K
- Keywords:
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- Channel Capacity;
- Communication Satellites;
- Demand Assignment Multiple Access;
- Downlinking;
- Multichannel Communication;
- Satellite Communication;
- Uplinking;
- Earth Terminals;
- False Alarms;
- Frequency Division Multiple Access;
- Ground Stations;
- Radio Relay Systems;
- Satellite Transmission;
- Time Division Multiple Access;
- Communications and Radar