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Coded modulation with unequal error protection

  • US 5,105,442 A
  • Filed: 11/07/1990
  • Issued: 04/14/1992
  • Est. Priority Date: 11/07/1990
  • Status: Expired due to Term
First Claim
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1. A method comprising the steps ofencoding a first group of data elements to generate a first expanded group of data elements,identifying one of a plurality of supersymbols of a predetermined channel symbol constellation in response to the first expanded group of data elements, each supersymbol being comprised of a respective plurality of symbols of the constellation,selecting an individual one of the symbols of the identified supersymbol at least in response to a second group of data elements, andapplying to a communication channel a signal representing the selected symbol,the minimum distance between at least ones of the symbols of at least one of the supersymbols being the same as the minimum distance between the symbols of the constellation as a whole.

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