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1. 发明申请

US20070234185A1 Fault Tolerant Decoding Method and Apparatus 有权
标题翻译：容错解码方法和装置
公开(公告)号：US20070234185A1
公开(公告)日：2007-10-04
申请号：US11761662
申请日：2007-06-12
申请人： Michael Maiuzzo , Jesse Warner , Theodore Harwood , John Smith
发明人： Michael Maiuzzo , Jesse Warner , Theodore Harwood , John Smith
IPC分类号： H03M13/03
CPC分类号： H03M13/2936 , H03M13/154 , H03M13/3738 , H03M13/4138
摘要： Units of forward error correction (FEC) encoded bits each represent a one-bit data value and include correctness bits that together reflect a probability that the one-bit data value represented by the unit is correct. The units of FEC encoded bits are decoded by using the correctness bits to perform soft-decision convolution decoding on the units of FEC bits. Block code symbols that are prone to having been erroneously decoded via soft-decision convolution decoding are identified by determining whether the convolutional decoder “changes its mind” as indicated by a trellis decode path change during the convolutional decoding such that the last state of a lowest cost path after the path change does not agree with the penultimate state of a lowest cost path immediately prior to the path change. Such a path change indicates that the data input to the convolutional decoder is so corrupted so as to be substantially unlikely to be correctly decoded by the convolutional decoder. Distribution of quality of bits being below a threshold level of quality is used as an adjunct for determining if additional symbols are to be identified as likely erroneously convolutionally decoded. Cost factor during convolutional decode is also taken into account as a further adjunct for determining if additional symbols are to be identified as likely erroneously convolutionally decoded. Among the symbols produced for block decoding, symbols identified as likely erroneously convolutionally decoded are tagged for erasure during subsequent soft-decision block decoding.
摘要翻译：前向纠错（FEC）编码位的单位各自表示一位数据值，并包括一起反映由该单元表示的一位数据值正确的概率的正确性位。通过使用正确比特对FEC编码比特的单位进行解码，以对FEC比特的单位执行软判决卷积解码。通过软判决卷积解码容易被错误解码的块代码符号通过确定卷积解码器是否改变其思想来识别，如卷积解码期间的网格解码路径改变所指示的，使得最低状态的最后状态路径更改后的成本路径与路径更改之前的最低成本路径的倒数第二个状态不一致。这样的路径改变指示输入到卷积解码器的数据被如此破坏，从而不可能被卷积解码器正确地解码。使用低于质量水平的比特质量的分布被用作确定附加符号是否被错误卷积解码的可能性的附件。也考虑卷积解码期间的成本因素作为用于确定是否将附加符号识别为可能被错误卷积解码的另外的附件。在为块解码产生的符号中，在随后的软判决块解码期间，将被识别为可能被错误卷积解码的符号标记为擦除。

2. 发明申请

US20070234171A1 Fault Tolerant Decoding Method and Apparatus Including Use of Quality Information 有权
标题翻译：包含使用质量信息的容错解码方法和设备
公开(公告)号：US20070234171A1
公开(公告)日：2007-10-04
申请号：US11761671
申请日：2007-06-12
申请人： Michael Maiuzzo , Jesse Warner , Theodore Harwood , John Smith
发明人： Michael Maiuzzo , Jesse Warner , Theodore Harwood , John Smith
IPC分类号： H03M13/00
CPC分类号： H03M13/4138 , H03M13/154 , H03M13/2936 , H03M13/3738 , H03M13/45 , H03M13/6325
摘要： Units of forward error correction (FEC) encoded bits each represent a one-bit data value and include correctness bits that together reflect a probability that the one-bit data value represented by the unit is correct. The units of FEC encoded bits are decoded by using the correctness bits to perform soft-decision convolution decoding on the units of FEC bits. Block code symbols that are prone to having been erroneously decoded via soft-decision convolution decoding are identified by determining whether the convolutional decoder “changes its mind” as indicated by a trellis decode path change during the convolutional decoding such that the last state of a lowest cost path after the path change does not agree with the penultimate state of a lowest cost path immediately prior to the path change. Such a path change indicates that the data input to the convolutional decoder is so corrupted so as to be substantially unlikely to be correctly decoded by the convolutional decoder. Distribution of quality of bits being below a threshold level of quality is used as an adjunct for determining if additional symbols are to be identified as likely erroneously convolutionally decoded. Cost factor during convolutional decode is also taken into account as a further adjunct for determining if additional symbols are to be identified as likely erroneously convolutionally decoded. Among the symbols produced for block decoding, symbols identified as likely erroneously convolutionally decoded are tagged for erasure during subsequent soft-decision block decoding.
摘要翻译：前向纠错（FEC）编码位的单位各自表示一位数据值，并包括一起反映由该单元表示的一位数据值正确的概率的正确性位。通过使用正确比特对FEC编码比特的单位进行解码，以对FEC比特的单位执行软判决卷积解码。通过软判决卷积解码容易被错误解码的块代码符号通过确定卷积解码器是否改变其思想来识别，如卷积解码期间的网格解码路径改变所指示的，使得最低状态的最后状态路径更改后的成本路径与路径更改之前的最低成本路径的倒数第二个状态不一致。这样的路径改变指示输入到卷积解码器的数据被如此破坏，从而不可能被卷积解码器正确地解码。使用低于质量水平的比特质量的分布被用作确定附加符号是否被错误卷积解码的可能性的附件。也考虑卷积解码期间的成本因素作为用于确定是否将附加符号识别为可能被错误卷积解码的另外的附件。在为块解码产生的符号中，在随后的软判决块解码期间，将被识别为可能被错误卷积解码的符号标记为擦除。

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