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arXiv 0905.4164cs.ITmath.IT
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基于随机边局部补的多重Tanner图迭代译码

Iterative Decoding on Multiple Tanner Graphs Using Random Edge Local Complementation

Joakim Grahl Knudsen, Constanza Riera, Lars Eirik Danielsen, Matthew G. Parker, Eirik Rosnes

摘要:

在本文中,我们提出了提高性能的和积算法(SPA)交错SPA迭代与随机局部图更新规则。这个规则被称为边缘局部互补(edge local complementation,ELC),它的作用是在保留代码的同时修改Tanner图。我们以前已经展示了如何ELC操作可以用来实现迭代置换组解码器(SPA-PD)-最成功的迭代软判决解码策略之一,在小块长度。在这项工作中,我们利用的事实,ELC也可以给结构不同的奇偶校验矩阵相同的代码。我们的目的是描述一个简单的迭代解码器,运行SPA-PD不同的结构,完全基于随机使用的ELC操作。这称为SPA-ELC,我们重点关注具有强代数结构的小块长度代码。特别是,我们看看扩展Golay码和两个扩展的二次剩余码。无论是出错率性能和平均解码复杂度,在解码中所需的消息的平均总数来衡量,显着优于那些标准SPA,并与SPA-PD比较。然而,与SPA-PD相比,它需要对Tanner图进行全局操作,我们仅通过局部操作获得性能改善。这样的本地化算法本身具有数学意义,但也适合于并行/分布式实现。

英文摘要:

In this paper, we propose to enhance the performance of the sum-product algorithm (SPA) by interleaving SPA iterations with a random local graph update rule. This rule is known as edge local complementation (ELC), and has the effect of modifying the Tanner graph while preserving the code. We have previously shown how the ELC operation can be used to implement an iterative permutation group decoder (SPA-PD)--one of the most successful iterative soft-decision decoding strategies at small blocklengths. In this work, we exploit the fact that ELC can also give structurally distinct parity-check matrices for the same code. Our aim is to describe a simple iterative decoder, running SPA-PD on distinct structures, based entirely on random usage of the ELC operation. This is called SPA-ELC, and we focus on small blocklength codes with strong algebraic structure. In particular, we look at the extended Golay code and two extended quadratic residue codes. Both error rate performance and average decoding complexity, measured by the average total number of messages required in the decoding, significantly outperform those of the standard SPA, and compares well with SPA-PD. However, in contrast to SPA-PD, which requires a global action on the Tanner graph, we obtain a performance improvement via local action alone. Such localized algorithms are of mathematical interest in their own right, but are also suited to parallel/distributed realizations.

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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