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Uplink signal detection in RF repeaters

  • US 8,223,821 B2
  • Filed: 06/25/2009
  • Issued: 07/17/2012
  • Est. Priority Date: 06/25/2009
  • Status: Expired due to Fees
First Claim
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1. A method for detecting an IS-95 signal without knowledge of a spreading code for the IS-95 signal, the method comprising:

  • rotating a received baseband signal through a plurality of phase-shifts;

    for each phase-shifted baseband signal;

    realigning an in-phase component or a quadrature component of the phase-shifted baseband signal;

    multiplying the in-phase and quadrature components by a PN short code to partially despread the components;

    multiplying the partially despread in-phase and quadrature components; and

    integrating the multiplied partially despread in-phase and quadrature components;

    comparing the integrated despread in-phase and quadrature components to a threshold value; and

    in response to exceeding the threshold value, identifying the received baseband signal as an IS-95 signal.

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