System and method for reducing the peak power in multi-carrier modulation
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United States of America Patent
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Dec 19, 2006
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app pub date -
Aug 23, 2002
filing date -
Aug 23, 2001
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Abstract
A multi-tone modulation method is provided which reduces a peak average power ratio. The method involves defining a respective signal constellation for each center frequencies having redundant mappings for each set of input elements, and then selecting a particular permutation of mappings having a reduced peak power for the multi-tone signal. A method of shaping is also employed in which a hierarchy of blocks are defined, each layer having fewer blocks than each previous layer. The hierarchy is used to select a particular subset of an expanded constellation.
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