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arXiv 1105.4665cs.ITmath.IT
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基于受抑环的改进线性规划译码

Improved Linear Programming Decoding using Frustrated Cycles

Shrinivas Kudekar, Jason K. Johnson, Misha Chertkov

摘要:

我们考虑使用低密度奇偶校验码在二进制输入加性高斯白噪声信道上的传输。用于解码低密度奇偶校验码的最流行的技术之一是线性规划解码器。一般来说,线性规划解码器是次优的。即,字出错率高于最佳最大后验解码器。在本文中,我们提出了一个系统的方法来提高线性规划解码器。更准确地说,在线性规划输出分数解的情况下,我们给出了一个简单的算法来识别导致线性规划输出为分数解的受挫环。然后添加这些周期,自适应的基本线性规划,我们表现出改善的字出错率的性能。

英文摘要:

We consider transmission over a binary-input additive white Gaussian noise channel using low-density parity-check codes. One of the most popular techniques for decoding low-density parity-check codes is the linear programming decoder. In general, the linear programming decoder is suboptimal. I.e., the word error rate is higher than the optimal, maximum a posteriori decoder. In this paper we present a systematic approach to enhance the linear program decoder. More precisely, in the cases where the linear program outputs a fractional solution, we give a simple algorithm to identify frustrated cycles which cause the output of the linear program to be fractional. Then adding these cycles, adaptively to the basic linear program, we show improved word error rate performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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