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Trellis encoding technique for PCM modems

  • US 6,301,683 B1
  • Filed: 06/09/1998
  • Issued: 10/09/2001
  • Est. Priority Date: 06/09/1997
  • Status: Expired due to Fees
First Claim
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1. A method of normalizing a receiver metric used by an error reduction/correction algorithm on a stream of symbols wherein said symbols are non-uniformly spaced, comprising:

  • determining a minimum distance (dmin) between two closest symbols in said stream;

    for each symbol in said stream, determining a minimum distance (dsym) between said each symbol in said stream and each of its adjacent neighboring symbols; and

    normalizing said receiver metric used by said error reduction/correction algorithm by the ratio dmin/dsym.

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