Receiver for a trellis coded digital television signal

  • US 5,636,251 A
  • Filed: 01/29/1996
  • Issued: 06/03/1997
  • Est. Priority Date: 07/08/1994
  • Status: Expired due to Term
First Claim
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1. A data receiver comprising:

  • means for developing a received data signal comprising a plurality of regularly spaced one-dimensional symbols of a phase variant symbol constellation, each of said symbols representing 3-bits Z0, Z1, Z2 produced by coding a first data bit X1 using a multi-state convolution coder to derive bits Z0, Z1 and a second data bit X2 using a modulo - 2 precoder to derive bit Z2, wherein bits Z0, Z1 identify respective subsets (a-d) of said symbols, each of said subsets (a-d) comprising two equally spaced symbol values, and bits Z1, Z2 identify respective pairs of said symbols each comprising two adjacent symbol values;

    decoder means for estimating data bit X1 and a bit Y1 from the received data signal; and

    a postcoder for generating an estimation of data bit X2 in response to estimated bit Y2.

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