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Receiver for use in a code shift keying spread spectrum communications system

  • US 6,671,311 B1
  • Filed: 04/18/2000
  • Issued: 12/30/2003
  • Est. Priority Date: 06/20/1997
  • Status: Expired due to Fees
First Claim
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1. A receiver for use in a code shift keying spread spectrum communication system comprising:

  • a front end circuit coupled to a channel and adapted to filter a receive input signal into N streams, each receive sample stream associated with one of said frequency bands;

    N receiver circuits coupled to said front end circuit, each receiver circuit associated with a frequency band, each receiver circuit comprising;

    a template comprising a plurality of taps;

    initialization means operative to generate an initial value for said template from a plurality of training symbols stripped of rotation and phase whereby said template is initialized to said channel;

    means for generating receive symbols from a corresponding one of said receive sample streams;

    a correlator adapted to correlate the contents of said template with said received symbols, said correlator operative to generate a correlation sum for each relative rotation between said templated and said received symbols, for all possible transmitted rotations of a symbol;

    a combiner for combining the correlation sums generated by said N receiver circuits so as to yield a total correlation value;

    a maximum correlator detector operative to determine a shift index corresponding to a maximum total correlation value over all rotations of said template, said shift index subsequently decoded to yield receive data; and

    wherein N is a positive integer.

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