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Digital equalization method and apparatus

  • US 5,164,959 A
  • Filed: 01/22/1991
  • Issued: 11/17/1992
  • Est. Priority Date: 01/22/1991
  • Status: Expired due to Term
First Claim
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1. A digital equalizer for use with a spread spectrum communications system, said digital equalizer comprising:

  • data input means for receiving an input signal comprising a correlated output signal corresponding to a complex I and Q-channel digital signal that has a data phase associated with a non-dispersive channel and a random phase associated with a dispersive channel;

    time delay means for delaying the input signal to produce a time delayed input signal;

    demodulation means for determining the data phase contained in the input signalfirst combining means for combining the time delayed input signal with the data phase of the input signal to produce an estimated matched filter signal;

    accumulating means for computing an accumulated estimated matched filter signal;

    second combining means for combining the correlated output signal with the accumulated matched filter signal to eliminated the random phase contained in the correlated output signal;

    integrating means for integrating the correlated output signal to increase the signal to noise ration thereof and for providing a time equalized signal.

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