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Method and system for decoding multilevel signals

  • US 20020196510A1
  • Filed: 03/28/2002
  • Published: 12/26/2002
  • Est. Priority Date: 04/04/2001
  • Status: Active Grant
First Claim
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1. An optical receiver for receiving and decoding a multilevel optical communication signal, comprising:

  • a plurality of first comparators for estimating a transmitted level based on the received multilevel signal;

    a decoder coupled to the first comparators;

    a second comparator connected in parallel with the first comparators, for indicating when the received signal exceeds a voltage;

    a filter coupled to the second comparator, for calculating a cumulative distribution function for the received multilevel signal;

    an analog-to-digital converter coupled to the filter for sampling a cumulative distribution function; and

    a microcontroller for processing the cumulative distribution function to determine threshold voltage values, for feeding the threshold voltage values to the first comparators for decoding the multilevel signal.

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