一种可快速编码的QC-LDPC码构造新方法

为解决LDPC码的编码复杂度问题，使其更易于硬件实现，提出了一种可快速编码的准 循环LDPC码构造方法。该方法以基于循环置换矩阵的准循环LDPC码为基础，通过适当的打孔 和行置换操作，使构造码的校验矩阵具有准双对角线结构，可利用校验矩阵直接进行快速编 码，有效降低了LDPC码的编码复杂度。仿真结果表明，与IEEE 802.16e中的LDPC码相比，新 方法构造的LDPC码在低编码复杂度的基础上获得了更好的纠错性能。

A new design method for quasi-cyclic LDPC codes with fast encoding ability

A new design of quasi cyclic (QC) LDPC codes with easier hardware implementatio n is proposed to lower the encoding complexity. Based on the QC LDPC codes with circulant permutation matrices, the masking method and line permutations are ut ilized to make the parity check matrix have the quasi dual diagonal structure, and the fast encoding algorithm directly from the parity check matrix can reduce the encoding complexity effectively. Simulation results show that compared with the QC LDPC codes from the IEEE 802.16e standard, the constructed codes have better performance while maintaining the low encoding complexity.