Trellis coding method and arrangement for fractional bit rates
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United States of America Patent
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Jul 10, 1990
Grant Date -
N/A
app pub date -
May 30, 1989
filing date -
May 30, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal coding technique for use with fractional bit rates is disclosed which, for a given dimensionality, allows the use of smaller constellations, and thus provides greater robustness in the presence of various impairments, than would otherwise be the case yet entails essentially no decoding delay penalty. In this technique, one or more of the input bits are trellis encoded and the trellis-encoded bits identify one of a predetermined plurality of subsets of the signal constellation and the particular symbols selected for transmission from two or more identified subsets are chosen by the non-trellis-encoded bits interdependently.
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