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    LOW DENSITY PARITY CHECK (LDPC) DECODER USING BROADCAST MESSAGING
    7.
    发明申请
    LOW DENSITY PARITY CHECK (LDPC) DECODER USING BROADCAST MESSAGING 有权
    低密度奇偶校验（LDPC）解码器使用广播消息传递

    公开(公告)号：US20100031114A1

    公开(公告)日：2010-02-04

    申请号：US12182575

    申请日：2008-07-30

    申请人： Kim B. Roberts ,  Manoj Verghese ,  James Harley ,  David Damian Nicholas Bevan

    发明人： Kim B. Roberts ,  Manoj Verghese ,  James Harley ,  David Damian Nicholas Bevan

    IPC分类号： H03M13/11 ,  G06F11/00 ,  G06F11/10

    CPC分类号： H03M13/1134 ,  H03M13/1114 ,  H04L1/0052 ,  H04L1/0057

    摘要： In a decoder implementing a belief propagation algorithm for iteratively decoding a Low Density Parity Check (LDPC) encoded data block, a method of computing messages to be sent by a first node of the decoder to at least one neighbour node of the decoder. The method comprises: processing messages received by the first node to remove an echo of a previous message sent by the first node to the at least one neighbour node in a previous iteration, to yield corresponding modified messages; computing a message for a current iteration using the modified messages; and broadcasting the computed message for the current iteration to each of the at least one neighbour nodes.

    摘要翻译： 在实现用于对低密度奇偶校验（LDPC）编码数据块进行迭代解码的置信传播算法的解码器中，一种计算将要由解码器的第一节点发送到解码器的至少一个相邻节点的消息的方法。 该方法包括：处理由第一节点接收的消息，以将先前迭代中的第一节点发送的先前消息的回波消除到至少一个相邻节点，以产生相应的修改消息; 使用修改的消息计算当前迭代的消息; 以及将针对当前迭代的所计算的消息广播到所述至少一个相邻节点中的每一个。

    Staggered parity
    8.
    发明授权
    Staggered parity 有权

    公开(公告)号：US09831987B2

    公开(公告)日：2017-11-28

    申请号：US15378834

    申请日：2016-12-14

    申请人： Shahab Oveis Gharan ,  James Harley ,  Kim B. Roberts

    发明人： Shahab Oveis Gharan ,  James Harley ,  Kim B. Roberts

    IPC分类号： H04L1/00 ,  G06F11/10 ,  H03M13/15 ,  H03M13/29

    CPC分类号： H04L1/0063 ,  G06F11/10 ,  H03M13/152 ,  H03M13/2915 ,  H03M13/2918 ,  H03M13/2921 ,  H03M13/2945 ,  H03M13/2963 ,  H04L1/0045

    摘要： Forward Error Correction technique: parity vectors are computed such that each parity vector spans multiple FEC frames; in a given FEC frame, a first set of syndrome bits are due to the parity vectors, and a second set of syndrome bits satisfy FEC equations that involve bits of the given FEC frame including the first set of syndrome bits; and the parity vectors are staggered with respect to any sequence in which the FEC frames are processed. Values of decoded bits of a first frame are deduced from known bits of a first parity vector having an effective length of one frame. For parity vectors having an effective length greater than one frame, a Log Likelihood Ratio of each unknown bit associated with the first frame is updated based on known and unknown bits of each parity vector. First frame is decoded using deduced bit values and updated LLR values.

    Staggered parity
    9.
    发明授权
    Staggered parity 有权
    交错平价

    公开(公告)号：US09537608B2

    公开(公告)日：2017-01-03

    申请号：US14564195

    申请日：2014-12-09

    申请人： Shahab Oveis Gharan ,  James Harley ,  Kim B. Roberts

    发明人： Shahab Oveis Gharan ,  James Harley ,  Kim B. Roberts

    IPC分类号： G06F11/00 ,  H03M13/00 ,  H04L1/00 ,  G06F11/10 ,  H03M13/29 ,  H03M13/15

    CPC分类号： H04L1/0063 ,  G06F11/10 ,  H03M13/152 ,  H03M13/2915 ,  H03M13/2918 ,  H03M13/2921 ,  H03M13/2945 ,  H03M13/2963 ,  H04L1/0045

    摘要： In a Forward Error Correction (FEC) technique, parity vectors are computed such that: each parity vector spans a set of frames; a subset of bits of each frame is associated with parity bits in each parity vector; and a location of parity bits associated with one frame in one parity vector is different from that of parity bits associated with the frame in another parity vector. Values of decoded bits of a first frame are deduced from known parity bits of a first parity vector having an effective length of one frame. For parity vectors having, an effective length greater than one frame, a Log Likelihood Ratio of each unknown parity bit associated with the first frame is updated based on known and unknown parity bits of each parity vector. The first frame is decoded using the deduced bit values and the updated LLR values.

    摘要翻译： 在前向纠错（FEC）技术中，计算奇偶校验向量，使得：每个奇偶校验向量跨越一组帧; 每个帧的比特的子集与每个奇偶校验向量中的奇偶校验位相关联; 并且与一个奇偶校验向量中的一帧相关联的奇偶校验位的位置与在另一个奇偶校验向量中与该帧相关联的奇偶校验位的位置不同。 从具有一帧的有效长度的第一奇偶校验向量的已知奇偶校验位推导第一帧的解码比特的值。 对于具有大于一帧的有效长度的奇偶校验向量，基于每个奇偶校验向量的已知和未知奇偶校验位来更新与第一帧相关联的每个未知奇偶校验位的对数似然比。 使用推导的比特值和更新的LLR值对第一帧进行解码。

    Preconfiguring compensation of optical path impairments
    10.
    发明授权
    Preconfiguring compensation of optical path impairments 有权
    预先配置光路损伤的补偿

    公开(公告)号：US07558478B1

    公开(公告)日：2009-07-07

    申请号：US11362912

    申请日：2006-02-28

    申请人： James Harley ,  Kim B. Roberts ,  Michel Belanger

    发明人： James Harley ,  Kim B. Roberts ,  Michel Belanger

    IPC分类号： H04B10/08 ,  H04B10/00

    CPC分类号： H04B10/0793

    摘要： A method of controlling optical signal traffic in an optical network between a transmitter and a plurality of receivers, where the transmitter is adapted to compensate optical impairments based on at least one optical parameter, includes steps of identifying each path between the transmitter and the plurality of receivers, determining a respective optical parameter for each path, selecting one of the receivers for receiving an optical signal from the transmitter, and enabling the transmitter to generate the optical signal using the respective optical parameter of the path between the transmitter and the selected receiver. By preconfiguring compensation parameters for the various paths in the network, an all-optical network can be implemented wherein optical signals can be switched, added or dropped without having to match dispersion maps or perform optical-electrical-optical regeneration.

    摘要翻译： 一种控制发射机和多个接收机之间的光网络中的光信号业务的方法，其中所述发射机适于基于至少一个光参数来补偿光学损伤，包括识别所述发射机与所述多个接收机之间的每个路径的步骤 接收机，为每个路径确定相应的光学参数，选择接收机之一以从发射机接收光信号，以及使发射机能够使用发射机和所选接收机之间的路径的相应光学参数来生成光信号。 通过预配置网络中各种路径的补偿参数，可以实现全光网络，其中光信号可被切换，添加或丢弃，而不必匹配色散图或进行光电光再生。