Shaped signal spaces in a simultaneous voice and data system
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United States of America Patent
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Dec 12, 1995
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N/A
app pub date -
Jun 14, 1993
filing date -
Jun 14, 1993
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Abstract
In a simultaneous voice and data communications system, a voice signal is mapped into an N-dimensional signal space constellation as a vector, and added to a reference signal point, i.e., a data symbol, where the data symbol is selected from a constellation of data symbols every signaling interval as a function of a data signal. The constellation signal space is further divided into a number of shaped regions, where each region is associated with a different one of the data symbols. The shape of each region is selected as a function of the characteristics of the voice, or audio, signal. In particular, each region illustratively has a rectangular shape.
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