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Trellis encoding technique for PCM modems

  • US 6,848,073 B2
  • Filed: 10/08/2001
  • Issued: 01/25/2005
  • Est. Priority Date: 06/09/1997
  • Status: Expired due to Fees
First Claim
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1. A method of performing four-dimensional error reduction/correction on a stream of one dimensional transmit symbols, comprising:

  • assigning a transmit output to a transmit symbol;

    concurrently assigning a one-dimensional subset label to said transmit symbol;

    storing three one-dimensional subset labels for three transmit symbols; and

    forming fourth transmit symbol such that an associated fourth one-dimensional subset label is partially determined by a combination of an output of an error reduction/correction algorithm and said three stored one-dimensional subset labels, wherein forming the fourth transmit symbol comprises;

    mapping respective pairs of one-dimensional subset labels selected from said fourth one-dimensional subset label and said three stored one-dimensional subset labels to produce first and second two-dimensional subset labels;

    mapping said first and second two-dimensional subset labels to produce a four-dimensional subset label; and

    providing said four-dimensional subset label as input to said error reduction/correction algorithm.

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