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Threshold detector for detecting synchronization signals at correlator output during packet acquisition

  • US 6,724,834 B2
  • Filed: 02/22/2002
  • Issued: 04/20/2004
  • Est. Priority Date: 02/22/2002
  • Status: Expired due to Term
First Claim
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1. A threshold detector for a wireless receiver configured to detect synchronization signals of packets transmitted in a wireless medium, comprising:

  • a correlator that compares received signals with predetermined synchronization signals and that provides a correlation signal indicative thereof;

    a short-term integrator, coupled to the correlator, that integrates a predetermined short term of the correlated signal and that provides a short term moving average signal;

    a long-term integrator, coupled to the correlator, that integrates a predetermined long term of the correlated signal and that provides a long term moving average signal;

    a multiplier, coupled to the long-term integrator, that multiplies the long term moving average signal by a predetermined constant and that provides a corresponding dynamic threshold signal; and

    a detector, coupled to the multiplier and the short-term integrator, that asserts a timing signal based on a crossover between the short term moving average signal and the dynamic threshold signal.

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