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arXiv 0907.1061cs.ITmath.IT
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布尔压缩感知与噪声群测试

Boolean Compressed Sensing and Noisy Group Testing

George Kamal Atia, Venkatesh Saligrama

摘要:

分组测试的基本任务是从大的总体中恢复一个小的可区分的项目子集,同时有效地减少测试(测量)的总数。本文的主要贡献是采用了一种新的信息理论的角度来看群体测试问题。我们制定的组测试问题作为一个信道编码/解码问题,并推导出一个单字母的表征用于识别缺陷集的测试总数。虽然本文的重点主要是在组测试,我们的主要结果是普遍适用于其他压缩感知模型。对于许多有趣的嘈杂组测试场景,单字母特征被证明是有序紧密的。具体来说,我们考虑一个加性伯努利($q$)噪声模型,我们表明,$N$项目和$K$缺陷,测试$T$的数量是$O(\frac{K\log N}{1-q})$任意小的平均错误概率和$O(\frac{K^2\log N}{1-q})$的最坏情况下的错误标准。我们还考虑了稀释效应,即阳性样本池中的缺陷项可能以$u$的概率被稀释,并可能被遗漏。在这种情况下,它表明,$T$是$O(\frac{K\log N}{(1-u)^2})$和$O(\frac{K^2\log N}{(1-u)^2})$的平均和最坏情况下的错误标准,分别。此外,我们的界限,使我们能够验证现有的已知界限,包括确定性的无噪声的情况下,无噪声组测试和近似重建有界失真。我们的可实现性证明是基于随机编码和最大似然检测器的分析,我们的信息论下限是基于法诺不等式。

英文摘要:

The fundamental task of group testing is to recover a small distinguished subset of items from a large population while efficiently reducing the total number of tests (measurements). The key contribution of this paper is in adopting a new information-theoretic perspective on group testing problems. We formulate the group testing problem as a channel coding/decoding problem and derive a single-letter characterization for the total number of tests used to identify the defective set. Although the focus of this paper is primarily on group testing, our main result is generally applicable to other compressive sensing models. The single letter characterization is shown to be order-wise tight for many interesting noisy group testing scenarios. Specifically, we consider an additive Bernoulli($q$) noise model where we show that, for $N$ items and $K$ defectives, the number of tests $T$ is $O(\frac{K\log N}{1-q})$ for arbitrarily small average error probability and $O(\frac{K^2\log N}{1-q})$ for a worst case error criterion. We also consider dilution effects whereby a defective item in a positive pool might get diluted with probability $u$ and potentially missed. In this case, it is shown that $T$ is $O(\frac{K\log N}{(1-u)^2})$ and $O(\frac{K^2\log N}{(1-u)^2})$ for the average and the worst case error criteria, respectively. Furthermore, our bounds allow us to verify existing known bounds for noiseless group testing including the deterministic noise-free case and approximate reconstruction with bounded distortion. Our proof of achievability is based on random coding and the analysis of a Maximum Likelihood Detector, and our information theoretic lower bound is based on Fano's inequality.

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