-LDPC -LLR LOG-LIKELIHOOD RATIOLLR DAMPENING IN LOW-DENSITY PARITY-CHECKLDPC DECODERS

摘要

The described embodiments provide a media controller for reading data stored on the media. The media controller determines a value for each bit of the shortened codeword from the media. The shortened codeword comprises a plurality of unshortened bits of the complete codeword, and the complete codeword comprises a plurality of unshortened bits and one or more shortened bits. The shortened bits correspond to unused bits 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 complete codeword is decoded using the first set of LLR values for the shortened codeword. The media controller attenuates 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.