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arXiv 1012.0602cs.ITcs.NAmath.ITmath.NA
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用于压缩感知的LDPC码

LDPC Codes for Compressed Sensing

University of Southern California(南加州大学);San Diego State University(圣地亚哥州立大学);Hewlett–Packard Laboratories(惠普实验室)

Alexandros G. Dimakis, Roxana Smarandache, Pascal O. Vontobel

AI总结:

本文建立了信道编码线性规划解码(CC-LPD)与压缩感知线性规划解码(CS-LPD,即基追踪)之间的数学联系,证明好的信道码的校验矩阵可作为好的压缩感知测量矩阵,并利用Gallager构造的高围长LDPC码首次实现了行数阶最优的确定性测量矩阵。

摘要:

我们提出了信道编码与压缩感知之间的数学联系。具体地,一方面将信道编码线性规划解码(CC-LPD)(一种针对二元线性码的最大似然信道解码的著名松弛)与另一方面压缩感知线性规划解码(CS-LPD)(也称为基追踪,一种广泛用于求解欠定线性方程组最稀疏解的线性规划松弛)联系起来。更确切地说,我们建立了基于实数域上零一测量矩阵的CS-LPD与将该测量矩阵视为二元奇偶校验矩阵所得到的二元线性信道码的CC-LPD之间的紧密联系。这种联系允许将一个设置下的性能保证转换到另一个设置。本文的主要信息是:“好”信道码的奇偶校验矩阵可以作为基追踪下可证明的“好”测量矩阵。特别地,我们利用Gallager构造的高围长低密度奇偶校验(LDPC)码,首次提供了具有阶最优行数的压缩感知测量矩阵的确定性构造。

英文摘要:

We present a mathematical connection between channel coding and compressed sensing. In particular, we link, on the one hand, \emph{channel coding linear programming decoding (CC-LPD)}, which is a well-known relaxation o maximum-likelihood channel decoding for binary linear codes, and, on the other hand, \emph{compressed sensing linear programming decoding (CS-LPD)}, also known as basis pursuit, which is a widely used linear programming relaxation for the problem of finding the sparsest solution of an under-determined system of linear equations. More specifically, we establis a tight connection between CS-LPD based on a zero-one measurement matrix over the reals and CC-LPD of the binary linear channel code that is obtained by viewing this measurement matrix as a binary parity-check matrix. This connection allows the translation of performance guarantees from one setup to the other. The main message of this paper is that parity-check matrices of "good" channel codes can be used as provably "good" measurement matrices under basis pursuit. In particular, we provide the first deterministic construction of compressed sensing measurement matrices with an order-optimal number of rows using high-girth low-density parity-check (LDPC) codes constructed by Gallager.

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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