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Coding for digital transmission

  • US 5,164,963 A
  • Filed: 11/07/1990
  • Issued: 11/17/1992
  • Est. Priority Date: 11/07/1990
  • Status: Expired due to Term
First Claim
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1. A method for communicating television information comprising the steps ofgenerating a digital signal representing the television information, the digital signal being comprised of at least first and second data streams of data elements,channel mapping the digital signal, andtransmitting the mapped signal over a communication channel,the mapping step being such that the probability of channel-induced error for the data elements of the first data stream is less than the probability of channel-induced error for the data elements of the second data stream,the mapping step comprising the step ofselecting a sequence of signal points from a predefined constellation of signal points to represent the data elements, the constellation being such that the minimum distance between signal points representing different values of the data elements of said first data stream is greater than the minimum distance between signal points representing the different values of the data elements of said second data stream.

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