Selectively applied hybrid min-sum approximation for constraint node updates of LDPC decoders
    1.
    发明授权
    Selectively applied hybrid min-sum approximation for constraint node updates of LDPC decoders 有权
    对LDPC解码器的约束节点更新进行选择性应用的混合最小和近似

    公开(公告)号:US08156409B2

    公开(公告)日:2012-04-10

    申请号:US12040230

    申请日:2008-02-29

    IPC分类号: H03M13/00

    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).

    摘要翻译: 根据一个或多个实施例,解码器可以确定对应于奇偶校验矩阵的特定约束节点的特定输出可靠性值的多个码字比特的最低可靠性值是否大于阈值(例如, ,偏移),如果是,则选择性地应用具有可靠性值修改(例如,偏移或归一化最小和近似)的经修改的最小和近似约束节点更新。

    Parallel maximum a posteriori detectors that generate soft decisions for a sampled data sequence
    4.
    发明授权
    Parallel maximum a posteriori detectors that generate soft decisions for a sampled data sequence 有权
    并行最大后验检测器,为采样数据序列产生软判决

    公开(公告)号:US07555070B1

    公开(公告)日:2009-06-30

    申请号:US11045632

    申请日:2005-01-28

    IPC分类号: H04L27/06 H03M13/00

    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.

    摘要翻译: 软判决值输出检测器包括多个最大后验(MAP)检测器。 MAP检测器并联连接,并且被配置为同时生成采样数据序列的部分的状态度量,并且基于生成的状态度量来生成软判决值。 MAP检测器可以以固定的等待时间方式生成软判决值,并且不缓冲磁盘驱动器中盘的整个扇区的采样数据序列。 MAP检测器可以至少以将采样数据序列的部分输入到MAP检测器的速率对采样数据序列的部分产生软判决值。

    SELECTIVELY APPLIED HYBRID MIN-SUM APPROXIMATION FOR CONSTRAINT NODE UPDATES OF LDPC DECODERS
    5.
    发明申请
    SELECTIVELY APPLIED HYBRID MIN-SUM APPROXIMATION FOR CONSTRAINT NODE UPDATES OF LDPC DECODERS 有权
    LDPC解码器的约束节点更新的选择性混合最小最小似然估计

    公开(公告)号:US20090222710A1

    公开(公告)日:2009-09-03

    申请号:US12040230

    申请日:2008-02-29

    IPC分类号: H03M13/00

    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).

    摘要翻译: 根据一个或多个实施例,解码器可以确定对应于奇偶校验矩阵的特定约束节点的特定输出可靠性值的多个码字比特的最低可靠性值是否大于阈值(例如, ,偏移),如果是,则选择性地应用具有可靠性值修改(例如,偏移或归一化最小和近似)的经修改的最小和近似约束节点更新。