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Apparatus and method for performing a signal search in a coherent wireless communication system

  • US 6,125,137 A
  • Filed: 09/11/1998
  • Issued: 09/26/2000
  • Est. Priority Date: 09/11/1998
  • Status: Expired due to Term
First Claim
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1. A multipath searcher for use in a coherent code division multiple access (CDMA) wireless communication system conveying a mobile communication signal, the multipath searcher including a plurality search paths searching at a corresponding plurality time offsets for the mobile communication signal, the multipath searcher comprising:

  • a PN despreader having as input a set of in-phase (I) and quadrature (Q) components, and outputting a combined set of despread pilot and data in-phase (I) and quadrature (Q) components at a corresponding time offset;

    a pilot signal Walsh code despreader having as input the combined set of despread pilot and data in-phase (I) and quadrature (Q) components, and outputting a pilot signal portion;

    an energy accumulator for receiving, during a time period, the pilot signal portion, and outputting a corresponding energy metric at the corresponding time offset; and

    an energy adjustment generator having as inputs, the energy metric, the combined set of pilot and data in-phase (I) and quadrature (Q) components, the pilot signal portion, and a combined signal symbol stream from a RAKE receiver, for generating a signal representative of a likelihood that the corresponding time offset corresponds to a valid time offset of the mobile communication signal.

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