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arXiv 1108.6239cs.ITcond-mat.stat-mechmath.IT
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基于有限域上码的统计物理的高效数据压缩

Efficient data compression from statistical physics of codes over finite fields

Alfredo Braunstein, Farbod Kayhan, Riccardo Zecchina

摘要:

本文讨论了一种新的基于q阶伽罗瓦域上腔方法的二元对称信源的数据压缩技术。我们提出了一个低复杂度和接近最佳的经验性能的计划。压缩步骤基于GF(q)上稀疏低密度奇偶检验码的减少,并且通过所谓的增强置信传播方程来完成。这些减少的代码似乎有一个非平凡的几何修改的空间的码字,使这种压缩计算上可行的。每次迭代的计算复杂性为O(d.n.q.log(q)),其中d是校验节点的平均度,n是位数。对于我们的代码集成,解压缩可以在一个时间线性的代码的长度通过一个简单的叶删除算法。

英文摘要:

In this paper we discuss a novel data compression technique for binary symmetric sources based on the cavity method over a Galois Field of order q (GF(q)). We present a scheme of low complexity and near optimal empirical performance. The compression step is based on a reduction of sparse low density parity check codes over GF(q) and is done through the so called reinforced belief-propagation equations. These reduced codes appear to have a non-trivial geometrical modification of the space of codewords which makes such compression computationally feasible. The computational complexity is O(d.n.q.log(q)) per iteration, where d is the average degree of the check nodes and n is the number of bits. For our code ensemble, decompression can be done in a time linear in the code's length by a simple leaf-removal algorithm.

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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