Method for low complexity decision metric compression of higher-order square-QAM constellation

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United States of America Patent

PATENT NO 9503305
SERIAL NO

14849281

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It is possible to compress log likelihood ratios (LLRs) by exploiting the mapping symmetry between bits in the same symbol. For example, two LLRs corresponding to the same dimension of a square Quadrature Amplitude Modulation (QAM) symbol can be compressed into a single compressed LLR that excludes the magnitude bits of one of the LLRs because the magnitude component of LLRs for bits corresponding to the same dimension of a square QAM symbol exhibit a piecewise linear relationship with one another. Similar techniques can be used to exploit piecewise linear relationships between a subset of constellation points in a non-square QAM constellation.

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Patent Owner(s)

  • HUAWEI TECHNOLOGIES CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mitra, Jeebak Ottawa, CA 23 102
Zhang, Zhuhong Ottawa, CA 73 469

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