Transmission power control system in a satellite communication
First Claim
Patent Images
1. A transmission power control system in a satellite communication system comprising:
- a plurality of small earth stations;
a satellite; and
a relay earth station which has larger antenna and a higher power transmitter than antennas and transmitters of said small earth stations, so that digital communication between said small earth stations is performed through said satellite and said relay earth station, said relay earth station regenerates received digital signals,each of said small earth stations measures rain attenuation in a down link from the satellite to the small earth stations, and sends information about rain attenuation in an up link from each small earth station to the satellite based upon measured data in the down link,said small earth station sending the information about rain attenuation in the up link to the relay earth station together with the transmission signal,the relay earth station controls transmission power to said small earth station according to the rain attenuation information received from each said small earth station, so that resin attenuation at the small earth station is compensated
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Abstract
A satellite communication system between small earth stations through a satellite and a relay earth station. The relay earth station has a larger antenna and a higher power transmitter than those of a small earth station in order to regenerate received digital signals. The transmission power of the relay earth station is controlled according to rain attenuation between the satellite and the small earth station, and/or rain attenuation between the satellite and the relay earth station, so that rain attenuation is compensated by increasing the transmission power of the relay earth station.
39 Citations
5 Claims
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1. A transmission power control system in a satellite communication system comprising:
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a plurality of small earth stations; a satellite; and a relay earth station which has larger antenna and a higher power transmitter than antennas and transmitters of said small earth stations, so that digital communication between said small earth stations is performed through said satellite and said relay earth station, said relay earth station regenerates received digital signals, each of said small earth stations measures rain attenuation in a down link from the satellite to the small earth stations, and sends information about rain attenuation in an up link from each small earth station to the satellite based upon measured data in the down link, said small earth station sending the information about rain attenuation in the up link to the relay earth station together with the transmission signal, the relay earth station controls transmission power to said small earth station according to the rain attenuation information received from each said small earth station, so that resin attenuation at the small earth station is compensated - View Dependent Claims (2, 3, 4, 5)
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Specification