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Earth station capable of effectively using a frequency band of a satellite

  • US 4,905,221 A
  • Filed: 08/24/1988
  • Issued: 02/27/1990
  • Est. Priority Date: 08/24/1987
  • Status: Expired due to Fees
First Claim
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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:

  • 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.

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