MODULATION-ASSISTED PREPROCESSING FOR NON-BINARY LDPC DECODING
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United States of America Patent
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Issued Date -
May 7, 2015
app pub date -
Nov 4, 2013
filing date -
Nov 4, 2013
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Abandoned
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Abstract
A modulation-assisted preprocessing scheme for non-binary LDPC reduces the computational complexity of non-binary LDPC decoding. A received signal is directly mapped onto a truncated symbol vector through a table lookup. The mapping table is built off-line based on the characteristics of a constellation structure. The receiver calculates and, if necessary, ranks the reliability of the symbols in the truncated vectors. This avoids unnecessary reliability calculation and ranking during on-line operation. The disclosed preprocessing methods offer lower computational complexity in terms of ranking and addition operations while offering the same error rate performance as conventional EMS preprocessing.
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