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    • 4. 发明授权
    • Low complexity finite precision decoders and apparatus for LDPC codes
    • 低复杂度有限精度解码器和LDPC码装置
    • US08458556B2
    • 2013-06-04
    • US12900584
    • 2010-10-08
    • Shiva K. PlanjeryShashi Kiran ChilappagariBane VasicDavid Declercq
    • Shiva K. PlanjeryShashi Kiran ChilappagariBane VasicDavid Declercq
    • H03M13/00
    • H03M13/1171H03M13/1117H03M13/1137H03M13/114H03M13/1142H03M13/3707H03M13/6577H04L1/005H04L1/0057
    • In this invention, a new class of finite precision multilevel decoders for low-density parity-check (LDPC) codes is presented. These decoders are much lower in complexity compared to the standard belief propagation (BP) decoder. Messages utilized by these decoders are quantized to certain levels based on the number of bits allowed for representation in hardware. A message update function specifically defined as part of the invention, is used to determine the outgoing message at the variable node, and the simple min operation along with modulo 2 sum of signs is used at the check node. A general methodology is provided to obtain the multilevel decoders, which is based on reducing failures due to trapping sets and improving the guaranteed error-correction capability of a code. Hence these decoders improve the iterative decoding process on finite length graphs and have the potential to outperform the standard floating-point BP decoder in the error floor region. The description and apparatus of 3-bit decoders for column-weight three LDPC codes is also presented.
    • 在本发明中,提出了一种新型的用于低密度奇偶校验(LDPC)码的有限精度多级解码器。 与标准置信传播(BP)解码器相比,这些解码器的复杂度要低得多。 由这些解码器使用的消息基于允许在硬件中表示的比特数被量化到某个等级。 特定定义为本发明一部分的消息更新功能用于确定可变节点处的传出消息,并且在校验节点处使用简单最小操作以及模2符号和。 提供了一种通用的方法来获得多级解码器,该解码器基于减少陷阱集合造成的故障并提高代码的有保障的纠错能力。 因此,这些解码器改进了有限长度图上的迭代解码过程,并且具有在误差区域中优于标准浮点BP解码器的潜力。 还提出了用于列重三个LDPC码的3位解码器的描述和装置。