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METHOD AND DEVICE OF PEAK DETECTION IN PREAMBLE SYNCHRONIZATION FOR DIRECT SEQUENCE SPREAD SPECTRUM COMMUNICATION

  • US 20090323766A1
  • Filed: 03/16/2006
  • Published: 12/31/2009
  • Est. Priority Date: 03/16/2006
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a preamble in a burst-type spread-spectrum communications system, the device comprising:

  • means for determining channel signal and noise features;

    means for performing a normalized peak-to-average ratio (PARN) test using the channel signal and noise features, wherein the means for performing a PARN test includes means for determining an outer code matched filter peak-to-average output value, means for normalizing said value by a time-averaged signal-to-noise ratio, and means for comparing said normalized peak-to-average ratio against a threshold value;

    means for performing a transition signal-to-noise ratio (SNR) test using the channel signal and noise features, wherein the means for performing a transition SNR test includes means for determining a ratio between an instant and a delayed time-averaged signal-to-noise ratio and comparing said ratio between an instant and a delayed time-averaged signal-to-noise ratio against a threshold value; and

    means for generating a preamble detection indication if the PARN test and the transition SNR test pass wherein generating the preamble detection indication is disabled during a transition period at an onset of an arrival of the preamble.

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