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Full duplex frequency division multiplex communication system

  • US 4,644,526 A
  • Filed: 11/13/1984
  • Issued: 02/17/1987
  • Est. Priority Date: 11/13/1984
  • Status: Expired due to Fees
First Claim
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1. A duplex frequency division multiplex communication system comprising:

  • a plurality of user stations intercoupled by a common communication channel, a first frequency converting means coupled to said common channel for shifting the carrier frequencies of the signals introduced to the common channel by all of the user stations by a particular frequency differential for reception by the user stations, each of said stations comprising a transceiver and each transceiver comprising;

    a source of information signals;

    modulating means coupled to said source for modulating said information signals on a first carrier of a particular frequency;

    second frequency converting means;

    first means for applying the first modulated carrier from said modulating means to said second frequency converting means to shift the first carrier to a selected channel frequency;

    second means coupled to said second frequency converting means for introducing the output from said second frequency converting means to said common channel;

    third frequency converting means;

    third means for introducing signals from said common channel modulated on a second carrier of a particular channel frequency to said third frequency converting means, said second carrier having a frequency displaced from the frequency of said first carrier by said particular frequency differential;

    demodulating means;

    fourth means for applying output signals from said third frequency converting means to said demodulating means to recover the signals modulated on the second carrier; and

    information reproducing means coupled to said demodulator means.

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