Log-likelihood ratio (LLR) dampening in low-density parity-check (LDPC) decoders

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United States of America Patent

PATENT NO 9337865
APP PUB NO 20140143637A1
SERIAL NO

13934999

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Abstract

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Described embodiments provide a media controller to read data stored in a media. The media controller determines a value for each bit of a shortened codeword from the media. The shortened codeword includes a plurality of non-shortened bits of a full codeword, where the full codeword includes the plurality of non-shortened bits and one or more shortened bits. Shortened bits correspond to bits unused in the shortened codeword. The media controller converts the determined values for each bit of the shortened codeword into a first set of log-likelihood ratio (LLR) values. The full codeword is decoded using the first set of LLR values for the shortened codeword. The media controller dampens one or more LLR values corresponding to non-shortened bits of the codeword to produce a second set of LLR values and decodes the second set of LLR values.

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Patent Owner(s)

  • SEAGATE TECHNOLOGY LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Alhussien, Abdel-Hakim S Milpitas, US 7 90
Cohen, Earl T Oakland, US 158 7178
Haratsch, Erich F San Jose, US 166 2897

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