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Reliable packet detection in a wireless receiver when packets contain a known repetitive sequence

  • US 7,746,812 B2
  • Filed: 07/16/2007
  • Issued: 06/29/2010
  • Est. Priority Date: 08/17/2006
  • Status: Active Grant
First Claim
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1. A method of detecting reception of packets in a wireless receiver, a preamble portion of each packet comprising a set of elements repeated to form a repetitive sequence, said method being implemented in said wireless receiver, said method comprising:

  • receiving a signal on a wireless medium;

    cross-correlating said signal with a copy of said set of elements at a plurality of time instances to generate a corresponding plurality of values, said cross-correlating comprising;

    multiplying each of a subset of signal values with corresponding element of said set of elements and adding the results of said multiplying to generate one of said plurality of values;

    computing a measure of variation in said plurality of values;

    determining that said signal represents said packet only if said measure of variation is greater than a threshold value; and

    generating a plurality of signal values representing the strength of said signal at corresponding time instances.

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