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Receiving method and apparatus for use in a spread-spectrum communication system

  • US 5,671,221 A
  • Filed: 06/14/1995
  • Issued: 09/23/1997
  • Est. Priority Date: 06/14/1995
  • Status: Expired due to Term
First Claim
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1. A receiving apparatus for use in a code division multiple access (CDMA) communication system wherein a spread-spectrum signal containing information bits is transmitted within an environment tending to produce multipath components, the receiving apparatus comprising:

  • a channel estimator configured to estimate channel coefficients corresponding to such multipath components for use in selecting multipath components;

    a channel selector configured to select one or more of the multipath components based on said channel coefficients, said channel selector producing time delay signals representing the time delay between such selected multipath components and producing weighting factors for each selected multipath component based on said channel coefficients;

    one or more diversity branches configured to operate on the spread-spectrum signal using time-delayed versions of a user-correlation signal to present said selected multipath components on said diversity branches, said time-delayed versions being determined by said time delay signals;

    a combiner configured to combine said diversity branches in a predetermined manner to produce a combined signal; and

    a decoder configured to extract the information bits from said combined signal.

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