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Spread spectrum correlator for recovering CCSK data from a PN spread MSK waveform

  • US 4,707,839 A
  • Filed: 09/26/1983
  • Issued: 11/17/1987
  • Est. Priority Date: 09/26/1983
  • Status: Expired due to Term
First Claim
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1. A spread spectrum demodulation apparatus for recovering information signals that have been combined with a prescribed encoding sequence and spread spectrum-modulated onto a carrier for transmission comprising:

  • first means for providing a replica of said prescribed encoding sequence;

    second means for providing a replica of the spreading sequence through which the combined information signals have been spread spectrum-modulated onto said carrier;

    third means, coupled to said first and second means, for combining said replica of said prescribed encoding sequence with said replica of said spreading sequence and producing therefrom a plurality of output signals respective ones of which correspond to respective combinations of said spreading sequence and said prescribed encoding sequence mutually shifted in time with respect to one another by successively offset time intervals; and

    fourth means, coupled to said third means, for correlating the respective outputs of said third means with received unknown information signals and deriving therefrom an output representative of the original information signals.

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