[发明专利]LDPC码字的交织映射方法及解交织解映射方法

权利要求书

1.一种LDPC码字的交织映射方法，其特征在于，包括如下步骤：

将所述LDPC码字中的校验部分进行第一次比特交织以得到校验比特流；

将所述LDPC码字中的信息比特部分与所述校验比特流拼接成第一次比特交织后的LDPC码字；

将所述第一次比特交织后的LDPC码字按预定长度分成连续的多个比特子块，并按照相应的比特交换图案变换所述比特子块的排列顺序以形成第二次比特交织后的LDPC码字；

将所述第二次比特交织后的LDPC码字分成第一部分和第二部分，将这两部分都按列顺序写入存储空间并按行顺序从该存储空间内读出以得到第三次比特交织后的LDPC码字；

对所述第三次比特交织后的LDPC码字依照相应的星座图进行星座映射以得到符号流；其中，所述比特交换图案和所述星座图都与不同码率的LDPC码表相对应。

2.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，将所述LDPC码字中的校验部分进行第一次比特交织以得到校验比特流包括：

将所述LDPC码字中的校验部分按列顺序写入存储空间并按行顺序从该存储空间内读出以得到校验比特流。

3.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，所述预定长度为360比特。

4.如权利要求1所述的LDPC码字的交织映射方法，其特征在于，

所述LDPC码表中LDPC码字的码长为64800比特、码率为9/15；

码表为：

相应的比特交换图案为：

49   3   37   148   166   153   119   140   40   124   60   84   5   2   141   127   92   10   32   172   12   130   9   103   58   90   168   81   107   64   28   2   75   19   41   7   62   66  149   160   132   20   78   47   139   27   100   23   116   45   157   77   35   74   14   134   131   86   179   156   56   94   54   110   101   51   24   120   161   88   31155   145   112   46   150   173   53   138   8   164   38   109   55   67   25   147   144   178   96   13   4   79   174  146  95   175  18   152  123  159  102  171  128  63   111  91   42   61   65   142  82   7222   16   105  68   99   17   26   69   1   34   39   17789   118  85   21   117  158  80   126  167  133  104  125  137  76   5   0   71   48  169  29   176  121  162  6   11  70   93   36   129  50   170  108  33   43   114  151  73   87  59   135  163  15   83   154  113  165  122  44   136  106  115   143  30   97   98   57

相应的星座图为：

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