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Technique for achieving the full coding gain of encoded digital signals

  • US 5,162,812 A
  • Filed: 10/11/1991
  • Issued: 11/10/1992
  • Est. Priority Date: 10/02/1989
  • Status: Expired due to Term
First Claim
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1. Apparatus for use in a communications system wherein transmitted data symbols can be represented by allowable signal points lying within a plurality of signal point subsets, said plurality of signal point subsets forming a signal constellation encompassing an associated region and the transmitted data symbol at each of a succession of times being represented by an allowable signal point in one signal point subset, said apparatus comprisingmeans for receiving the transmitted data symbol at each of said succession of times;

  • andmeans for assigning each received data symbol to a plurality of preferred signal points lying within an expanded constellation encompassing an expanded region and including said allowable signal points and at least one artificial signal point, each artificial signal point corresponding to a different allowable signal point and each preferred signal point in said plurality corresponding to a different one of said plurality of signal point subsets.

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