[发明专利]LDPC码字的交织和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码字按列顺序写入存储空间并按行顺序从该存储空间内读出，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320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57600比特、码率为5/6；

码表为：

相应的比特交换图案为：

1401417128816710114316001125573619924231334912228501181133034126197863181469339145128487511301328672139124177581371629180444094571351112389459510411115417129261342710423368315617255698741531615065851166614417114471216616362157974815276155136202521541164701053157710822961739214813153102109815910617414732767946138793517959100175149107151178821106816517090168125129115411581201311937816917638127121601037552161117141421693684643143

相应的星座图为：

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