Trellis shaping for modulation systems
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United States of America Patent
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Sep 22, 1992
Issued Date -
N/A
app pub date -
Oct 13, 1989
filing date -
Feb 16, 1989
priority date (Note) -
Expired
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Abstract
A digital data sequence is mapped into a signal point sequence for transmission, by selecting the signal point sequence from a subset of all possible signal point sequences based on the digital data sequence, all possible signal point sequences in the subset lying in a fundamental region of a trellis code, the fundamental region being other than a simple Cartesian product of finite-dimensional regions. In another aspect, a digital data sequence is mapped into a sequence of signal points for transmission, by specifying a class of possible sequences based on the digital data, and selecting the signal point sequence from the class, the selection being based on the respective average powers of the possible sequences of the class, the selection being based on not only a fixed-length block of the digital data.
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