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System and method for synchronization tracking in an in-band modem

  • US 8,817,934 B2
  • Filed: 07/26/2011
  • Issued: 08/26/2014
  • Est. Priority Date: 07/28/2010
  • Status: Active Grant
First Claim
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1. A method for identifying a sample slip in the transmission channel of an in-band modem comprising:

  • receiving a data bit, wherein the received data bit comprises a pulse positioned at one of a plurality of predetermined locations in a frame;

    correlating the received data bit with a reference signal; and

    identifying a sample slip based on the correlating,wherein the correlating comprises a two-stage search,wherein a first stage of the two-stage search comprises finding a plurality of possible maximum correlations within a first predetermined range around each of a first predetermined number of pulses in a frame, andwherein a second stage of the two-stage search comprises finding the maximum correlation among the possible maximum correlations.

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