Earth station capable of effectively using a frequency band of a satellite
First Claim
1. In an earth station for carrying out communication in a satellite communication system through a satellite by the use of an up-link frequency band and a down-link frequency band, said earth station comprising a transmission section responsive to first and second input signals for transmitting first and second transmission signals through said up-link frequency band towards said satellite, the improvement in combination with the foregoing wherein:
- each of said up-link and said down-link frequency bands has a plurality of frequency subbands spaced apart from one another with frequency gap bands interposed between said frequency subbands;
said transmission section comprising;
modulating means for modulating a carrier by said first input signal to produce a transmission subband signal occupying a selected one of said frequency subbands of the up-link frequency band;
first transmitting means coupled to said modulating means for transmitting said transmission subband signal as said first transmission signal through said selected one of the frequency subbands;
spread spectrum processing means for processing said second input signal into a spread spectrum transmission signal having said up-link frequency band; and
second transmitting means coupled to said spread spectrum processing means for transmitting said spread spectrum transmission signal as said second transmission signal through said up-link frequency band.
1 Assignment
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Accused Products
Abstract
For use in a satellite communication system which carries out communication through a satellite by the use of an up-link frequency band and a down-link frequency band, each of the up-link and the down-link frequency bands has a plurality of frequency subbands spaced apart from one another with frequency gap bands interposed between the frequency subbands. An earth station comprises a modulating arrangement (47) for modulating a selected one of the frequency subbands of the up-link frequency band by a first input signal into a subband transmission signal; a first transmitting arrangement (51) coupled to the modulating arrangement for transmitting the subband transmission signal through the selected one of the frequency subbands; a spread spectrum processing arrangement (50) for processing a second input signal into a spread spectrum transmission signal in the up-link frequency band; and a second transmitting arrangement (51) coupled to the spread spectrum processing arrangement for transmitting the spread spectrum transmission signal through the up-link frequency band.
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Citations
7 Claims
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1. In an earth station for carrying out communication in a satellite communication system through a satellite by the use of an up-link frequency band and a down-link frequency band, said earth station comprising a transmission section responsive to first and second input signals for transmitting first and second transmission signals through said up-link frequency band towards said satellite, the improvement in combination with the foregoing wherein:
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each of said up-link and said down-link frequency bands has a plurality of frequency subbands spaced apart from one another with frequency gap bands interposed between said frequency subbands; said transmission section comprising; modulating means for modulating a carrier by said first input signal to produce a transmission subband signal occupying a selected one of said frequency subbands of the up-link frequency band; first transmitting means coupled to said modulating means for transmitting said transmission subband signal as said first transmission signal through said selected one of the frequency subbands; spread spectrum processing means for processing said second input signal into a spread spectrum transmission signal having said up-link frequency band; and second transmitting means coupled to said spread spectrum processing means for transmitting said spread spectrum transmission signal as said second transmission signal through said up-link frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification