摘要： 基于RU算法校验矩阵的结构，提出一种准循环低密度奇偶校验(QC-LDPC)码构造方法，即合理选择各子阵，使 和 均为下双对角矩阵，从而实现复杂度为 的编码。仿真结果表明，构造的QC-LDPC码不但编码简单，而且在加性高斯白噪声信道中的纠错性能优于采用随机构造的QC-LDPC和实用化的Block-LDPC码。在误比特率为10-6时，可获得0.3 dB的信噪比增益。
关键词:
循环置换矩阵,
高效编码,
准循环低密度奇偶校验码,
信噪比增益
Abstract: Based on the structure of parity-check matrix of RU algorithm, a class of Quasi-cycle Low-density Parity-check (QC-LDPC) codes with complexity is constructed by selecting sub-matrices reasonably to restrict and consisting of lower dual diagonal matrices. Simulation results show that not only the proposed codes have lower complexity, but also the error-correcting performance is better than QC-LDPC codes randomly constructed and practical Block-LDPC codes in the additive white Gaussion noise channel. It can get 0.3 dB Signal to Noise Ratio(SNR) gain at a Bit Error Rate(BRE) of 10-6.
Key words:
circulant permutation matrix,
efficient encoding,
Quasi-cycle Low-density Parity-check(QC-LDPC) codes,
Signal to Noise Ratio (SNR) gain
中图分类号:
彭世章, 赵泽茂, 包建荣, 曹海燕. 一种低复杂度的准循环LDPC码构造[J]. 计算机工程, 2011, 37(13): 83-85,88.
BANG Shi-Zhang, DIAO Ze-Mao, BAO Jian-Rong, CAO Hai-Yan. Construction of Quasi-cycle Low-density Parity-check Codes with Low Complexity Degree[J]. Computer Engineering, 2011, 37(13): 83-85,88.