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    • 6. 发明申请
    • FAST CONVERGENCE LDPC DECODING USING BCJR ALGORITHM AT THE CHECK NODES
    • 使用BCJR算法的快速融合LDPC解码在检查NODES
    • WO2007110436A1
    • 2007-10-04
    • PCT/EP2007/052986
    • 2007-03-28
    • STMICROELECTRONICS N.V.KIENLE, FranckWEHN, NorbertBRACK, Torben
    • KIENLE, FranckWEHN, NorbertBRACK, Torben
    • H03M13/11
    • H03M13/3905H03M13/1165H03M13/1197H03M13/3972
    • Method of decoding LDPC codes such as IRA codes used in the DVB-S2 standard, the code graph comprising first variable nodes (systematic), second variable nodes (parity) having a degree two, and check nodes connected to second variable nodes by a zigzag connectivity, the method comprising a) grouping the check nodes into at least one group, the check nodes of each group being connected by variable nodes called internal variable nodes, b) performing for each group (GR j ) the following sub-steps b1) and b2): b1) jointly updating (71) all the check nodes of said group by using an algorithm of the Maximum-A-Posteriori (MAP) type on a two-state trellis, b2) updating (72, 73) all the first variable nodes and all the second variable nodes (PN i-1,i ; PN i,i+1 ) connected to said group except said at least one internal second variable node, c) iteratively repeating step b). When using a plurality of groups, a corresponding plurality of trellis windows are LogMAP decoded without training period since connecting parity nodes are updated according to the sum-product algorithm.
    • 对DVB-S2标准中使用的诸如IRA代码的LDPC码进行解码的方法,包括具有度2的第一可变节点(系统),第二可变节点(奇偶校验)的代码图,以及通过Z字形连接到第二可变节点的校验节点 所述方法包括:a)将所述校验节点分组为至少一个组,每个组的校验节点由被称为内部变量节点的变量节点连接,b)对每个组执行(GR 以下子步骤b1)和b2):b1)通过使用两状态网格上的最大后验(MAP)类型的算法来共同更新(71)所述组的所有校验节点,b2)更新 (72,73)连接到所述组的所有第一可变节点和所有第二可变节点(PN 1,i>,N i,i + 1)除 所述至少一个内部第二可变节点,c)迭代地重复步骤b)。 当使用多个组时,由于连接奇偶校验节点根据和积算法被更新,所以对应的多个网格窗口不进行训练周期的LogMAP解码。