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arXiv 0912.3907cs.ITmath.IT
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HDPC码的高效线性规划译码

Efficient Linear Programming Decoding of HDPC Codes

Alex Yufit, Asi Lifshitz, Yair Be'ery

摘要:

提出了几种改进的高密度奇偶检验(HDPC)码的线性规划(LP)译码算法。首先,我们使用一个代码的自同构群来创建奇偶校验矩阵的多样性,并从冗余的奇偶检验产生有效的削减。其次,我们提出了一个有效的混合整数解码器,利用分支定界方法。我们进一步提高建议的解码器,通过删除非活动的约束,并通过适应奇偶检验矩阵之前,根据信道的观察解码。基于仿真结果,所提出的解码器实现接近ML的性能与合理的复杂度。

英文摘要:

We propose several improvements for Linear Programming (LP) decoding algorithms for High Density Parity Check (HDPC) codes. First, we use the automorphism groups of a code to create parity check matrix diversity and to generate valid cuts from redundant parity checks. Second, we propose an efficient mixed integer decoder utilizing the branch and bound method. We further enhance the proposed decoders by removing inactive constraints and by adapting the parity check matrix prior to decoding according to the channel observations. Based on simulation results the proposed decoders achieve near-ML performance with reasonable complexity.

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