Trellis coded modulation system for digital television signal
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United States of America Patent
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Feb 4, 1997
Issued Date -
N/A
app pub date -
Jan 16, 1996
filing date -
Jul 8, 1994
priority date (Note) -
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Abstract
A trellis coded modulation system comprises a first coder for convolutionally coding a first input data bit X.sub.1 for deriving first and second output bits Z.sub.0 and Z.sub.1. A second coder precodes a second input data bit X.sub.2 for deriving an output bit Z.sub.2. The output bits Z.sub.0, Z.sub.1 and Z.sub.2 are mapped into corresponding one-dimensional multi-value symbols, wherein the output bits Z.sub.0, Z.sub.1 identify respective subsets of the symbols, each of the subsets comprising two equally spaced symbol values, and the output bits Z.sub.1, Z.sub.2 identify respective pairs of the symbols, each of the pairs comprising two adjacent symbol values.
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