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arXiv 1201.0409cs.ITmath.IT
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带噪声Slepian-Wolf问题的编码设计

Code Design for the Noisy Slepian-Wolf Problem

Arvind Yedla, Henry D. Pfister, Krishna R. Narayanan

摘要:

我们考虑一个嘈杂的Slepian-Wolf问题,其中两个相关的源分别编码(使用固定速率的代码),并通过两个独立的二进制无记忆对称信道传输。每个信道的容量由在发射机处未知的单个参数表征。我们的目标是设计系统,保持接近最佳的性能,而无需在发射机的信道知识。据证实,可能很难设计出在对称信道条件下性能良好的码。在这项工作中,我们提出了一个可证明的容量实现序列的LDGM合奏的擦除Slepian-Wolf问题与对称信道条件。我们还介绍了一个交错的结构,使单用户信道优化的代码执行良好的对称信道条件。我们提供了一个通用的框架,用于分析联合迭代解码的性能,使用密度进化。使用差分进化,我们设计打孔系统LDPC码,以最大限度地提高可实现的信道条件的区域。然后,交错所得到的代码,以进一步增加可实现的参数的区域。本文的主要贡献是证明,适当设计的不规则LDPC码可以同时在很宽的信道参数范围内执行。

英文摘要:

We consider a noisy Slepian-Wolf problem where two correlated sources are separately encoded (using codes of fixed rate) and transmitted over two independent binary memoryless symmetric channels. The capacity of each channel is characterized by a single parameter which is not known at the transmitter. The goal is to design systems that retain near-optimal performance without channel knowledge at the transmitter. It was conjectured that it may be hard to design codes that perform well for symmetric channel conditions. In this work, we present a provable capacity-achieving sequence of LDGM ensembles for the erasure Slepian-Wolf problem with symmetric channel conditions. We also introduce a staggered structure which enables codes optimized for single user channels to perform well for symmetric channel conditions. We provide a generic framework for analyzing the performance of joint iterative decoding, using density evolution. Using differential evolution, we design punctured systematic LDPC codes to maximize the region of achievable channel conditions. The resulting codes are then staggered to further increase the region of achievable parameters. The main contribution of this paper is to demonstrate that properly designed irregular LDPC codes can perform well simultaneously over a wide range of channel parameters.

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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