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一种可快速编码的QC-LDPC码构造新方法
刘原华,张美玲
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摘要:

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。

关键词: 低密度奇偶校验码准循环循环置换矩阵快速编码

DOI：

基金项目:国家自然科学基金资助项目(61001131，61201194，61172071)；陕西省教育厅专项科研计划项目（11JK1007）；西安邮电大学青年教师基金项目（0001286）

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

LIU Yuan-hua,ZHANG Mei-ling

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Abstract:

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.

Key words: low density parity check codes quasi cyclic circulant permutation matrix fast encoding