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Method and apparatus for improved high-speed FEC adaptive equalization

  • US 7,158,567 B2
  • Filed: 03/26/2004
  • Issued: 01/02/2007
  • Est. Priority Date: 09/11/2001
  • Status: Expired due to Term
First Claim
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1. A method for performing adaptive equalization comprising:

  • receiving a Forward Error Correction (FEC) encoded signal from a channel;

    filtering the received FEC encoded signal using a filter according to at least one adjustable filter coefficient to produce a filtered signal;

    evaluating the filtered signal to generate a signal error output;

    adjusting the at least one adjustable filter coefficient in response to the signal error output;

    performing FEC decode processing dependent on the filtered signal to generate an FEC output;

    adjusting the at least one adjustable filter coefficient in response to the FEC output;

    wherein the at least one adjustable filter coefficient is first adjusted in response to the signal error output, then adjusted in response to the FEC output;

    wherein the at least one adjustable filter coefficient is first adjusted in response to the signal error output until a specified condition is met, then adjusted in response to the FEC output; and

    wherein the specified condition relates to an error measure varying less than a predetermined amount in N iterations of adjusting the at least one adjustable filter coefficient, where N is a positive integer.

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