简单高效的LDPC码加权比特翻转译码算法.pdf

第 44 卷第 4 期电子科技大学学报 2015 年 7 月 Journal of University of Electronic Science and Technology of China Jul. 2015 简单高效的 LDPC 码加权比特翻转译码算法张高远,周亮,文红( 电子科技大学通信与抗干扰技术国家重点实验室成都 611731) 【摘要】现有的两种低密度奇偶校验(LDPC) 码加权比特翻转(WBF) 译码算法虽然具有较低的实现复杂度,但纠错性能并不理想。该文基于对两种 WBF 算法的物理意义和它们之间内在联系的详细理论分析,提出一种可靠度外信息修正(ERA) 方案。该方案显著提高了现有两种低复杂度译码算法校验方程可靠度的准确性,进而提高了翻转效率。仿真结果表明,在 AWGN 信道条件下, ERA 方案能显著提高现有两种 WBF 算法的译码性能,获得显著译码增益,从而实现了译码复杂度和性能间的良好折中。关键词比特翻转; 可靠度外信息修正; LDPC 码; 最大后验概率中图分类号 文献标志码 A doi:.1001- Simple and Efficient Weighted Bit-Flipping Decoding Algorithm for LDPC Codes ZHANG Gao-yuan, ZHOU Liang, and WEN Hong (National Key Laboratory of Science and Technology munications, University of Electronic Science and Technology of China Chengdu 611731) Abstract An extrinsic reliability adjustment (ERA) sche me of low-density parity-check (LDPC) codes is proposed in this paper based on theoretical analysis of the physical significance for two previous weighted bit-flipping (WBF) algorithms, which have plexity with poor error correcting performance. The novel scheme significantly improves the check-node realiability accuracy of the two previous WBF algorithms. Therefore, the flipping efficiency of the novel decoding algorithm is increased. The extensive simulations prove that th