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Method and system for determining symbol boundary timing in a multicarrier data transmission system

  • US 8,265,215 B1
  • Filed: 12/01/2009
  • Issued: 09/11/2012
  • Est. Priority Date: 06/09/2004
  • Status: Active Grant
First Claim
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1. A symbol timing unit configured to produce a plurality of difference values for a plurality of different potential symbol timing boundaries, the symbol timing unit comprising:

  • a subtractor configured to subtract (1) a first sample value of a first training symbol from (2) a second sample value of a second training symbol to produce a first difference value of the plurality of difference values;

    an absolute value circuit configured to calculate absolute value or magnitude;

    an accumulator configured to accumulate an absolute value or magnitude of the first difference value with an absolute value or magnitude of a second difference value of the plurality of difference values computed by the absolute value circuit, wherein the second difference value was previously computed;

    a controller configured to facilitate repeating of the subtracting in the subtractor and accumulating in the accumulator over at most a factor of a symbol length;

    an estimator configured to estimate noise due to inter-carrier and inter-symbol interference for at least one of the plurality of different potential symbol timing boundaries; and

    a comparator configured to select, based on the accumulated difference value produced by the accumulator, a choice of symbol boundary timing with substantially a least estimated noise due to inter-carrier and inter-symbol interference.

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