Multidimensional, convolutionally coded communication systems
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United States of America Patent
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Dec 15, 1987
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N/A
app pub date -
Apr 25, 1985
filing date -
Apr 25, 1985
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Expired
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Abstract
A family of multi-dimensional convolutionally coded modulation systems achieves enlarged minimum distance between possible sequences of signal points, reduced number of error events with the minimum distance, acceptable peak-to-average power ratio, reduced number of signal points in each constituent two-dimensional constellation, immunity to rapid carrier phase changes, and reduced complexity, resulting in a reduced error probability when maximum likelihood decoding is used. These advantages are achieved by the construction and by the partitioning into subsets of the multi-dimensional constellation, by the design of convolutional codes using those multi-dimensional subsets, by using a bit converter and a block encoder to convert a multi-dimensional constellation mapping into multiple two-dimensional constellations mappings, and by a simplified decoding technique.
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