摘要:
In accordance with one or more embodiments, a decoder may determine whether a lowest reliability value of a plurality of codeword bits that correspond to a particular output reliability value for a particular constraint node of a parity-check matrix is greater than a threshold value (e.g., an offset), and if so, selectively applies a modified min-sum approximation constraint node update with a reliability value modification (e.g., an offset or normalized min-sum approximation).
摘要:
A detector includes a Viterbi based detector and an erasure detector that detects as erasures one or more bits associated with a decoding window in which survivor paths do not merge within the decoding window.
摘要:
A soft decision value output detector includes a plurality of maximum a posteriori (MAP) detectors. The MAP detectors are connected in parallel, and configured to simultaneously generate state metrics for portions of a sampled data sequence, and to generate soft decision values based on the generated state metrics. The MAP detectors may generate soft decision values in a fixed latency manner and without buffering the sampled data sequence for a whole sector of a disk in a disk drive. The MAP detectors may generate soft decision values for portions of the sampled data sequence at least at a rate at which the portions of the sampled data sequence are input to the MAP detectors.
摘要:
In accordance with one or more embodiments, a decoder may determine whether a lowest reliability value of a plurality of codeword bits that correspond to a particular output reliability value for a particular constraint node of a parity-check matrix is greater than a threshold value (e.g., an offset), and if so, selectively applies a modified min-sum approximation constraint node update with a reliability value modification (e.g., an offset or normalized min-sum approximation).