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    • 4. 发明申请
    • Decoding method and apparatus
    • 解码方法和装置
    • US20030192001A1
    • 2003-10-09
    • US10116132
    • 2002-04-05
    • IIT Research Institute
    • Michael Anthony MaiuzzoKenneth Kahle Roberts
    • H03M013/00
    • H03M13/2936H03M13/154H03M13/45H03M13/6325
    • A method and apparatus for decoding forward error correction (FEC) encoded data. A stream of units of FEC encoded bits are received, where the units are derived from a transmitted signal, where each unit represents a one-bit data value, and where each unit includes correctness bits that together reflect a level of probability that the one-bit data value represented by the unit differs from corresponding bits in the signal before it was transmitted. The stream of units of FEC encoded bits are decoded by using the quality level of bits to perform soft-decision convolution decoding on the stream of units of FEC bits, where the soft-decision convolution decoding produces, for block decoding, a stream of symbols made up of bits. In the stream of units of FEC bits, subsequences of units that are prone to erroneous soft-decision convolution decoding are detected by determining, for the sub-sequences whether the distribution of quality bits indicate the units are below a threshold level of correctness, and by comparing characteristics of that distribution to a given set of characteristics predetermined to be prone to result in incorrect decoding. Among the symbols produced for block decoding, symbols containing one or more bits that correspond to units that were in subsequences detected to be prone to erroneous soft-decision convolution decoding are flagged or tagged, and thereby, errors in the stream of symbols may be soft-decision block decoded by erasing the flagged symbols.
    • 用于解码前向纠错(FEC)编码数据的方法和装置。 接收FEC编码比特流的流,其中单位是从发送信号导出的,其中每个单位表示一比特数据值,并且其中每个单元包括一起反映一次性概率水平的正确比特, 由单元表示的位数据值与发送前的信号中的相应位不同。 通过使用比特质量级对FEC编码比特的单位流进行解码,以对FEC比特单元流进行软判决卷积解码,其中软判决卷积解码产生用于块解码的符号流 由位组成。 在FEC比特单元流中,通过对于子序列确定质量比特的分配是否指示单位的阈值水平低于正确性的阈值来检测容易出现错误的软判决卷积解码的单元的子序列,以及 通过将该分布的特征与预定为容易导致不正确解码的给定特征集进行比较。 在为块解码产生的符号中,包含与被检测为容易出现错误的软判决卷积解码的子序列中的单元相对应的一个或多个位的符号被标记或标记,从而符号流中的错误可能是软的 - 通过擦除标记的符号来解码块。