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arXiv 0808.2659cs.ITmath.IT
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基于阿贝尔群码的分布式信源编码

Distributed Source Coding using Abelian Group Codes

Dinesh Krithivasan, S. Sandeep Pradhan

摘要:

在这项工作中,我们考虑一个分布式的信源编码问题的联合失真标准取决于源和重建。这包括作为特殊情况的计算源的函数的问题,在一定的失真,也是经典的Slepian-Wolf问题,Berger-Tung问题,Wyner-Ziv问题,Yeung-Berger问题和Ahlswede-Korner-Wyner问题。虽然信息论中的流行趋势是使用香农随机编码参数来证明可扩展性结果,但是对于许多问题,使用结构化随机码提供了比非结构化随机码更高的速率增益。出于这一动机,我们提出了一个新的可实现的率失真区域,这个问题的离散无记忆源的基础上建立在阿贝尔群的“好”的结构随机嵌套代码。我们证明了这个问题的收益率超过传统的编码方案,使用随机非结构化代码。对于某些源和失真函数,新的速率区域严格大于Berger-Tung速率区域,Berger-Tung速率区域是迄今为止该问题最知名的可实现速率区域。此外,不存在已知的实现这些速率增益的非结构化随机编码方案。作为主要编码定理证明的一部分,还得到了使用阿贝尔群码的单用户信源编码的可扩展性能极限。作为推论,我们还证明了嵌套线性码实现香农率失真界的单用户设置。

英文摘要:

In this work, we consider a distributed source coding problem with a joint distortion criterion depending on the sources and the reconstruction. This includes as a special case the problem of computing a function of the sources to within some distortion and also the classic Slepian-Wolf problem, Berger-Tung problem, Wyner-Ziv problem, Yeung-Berger problem and the Ahlswede-Korner-Wyner problem. While the prevalent trend in information theory has been to prove achievability results using Shannon's random coding arguments, using structured random codes offer rate gains over unstructured random codes for many problems. Motivated by this, we present a new achievable rate-distortion region for this problem for discrete memoryless sources based on "good" structured random nested codes built over abelian groups. We demonstrate rate gains for this problem over traditional coding schemes using random unstructured codes. For certain sources and distortion functions, the new rate region is strictly bigger than the Berger-Tung rate region, which has been the best known achievable rate region for this problem till now. Further, there is no known unstructured random coding scheme that achieves these rate gains. Achievable performance limits for single-user source coding using abelian group codes are also obtained as parts of the proof of the main coding theorem. As a corollary, we also prove that nested linear codes achieve the Shannon rate-distortion bound in the single-user setting.

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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