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• W2951447401 abstract "We study the compressed sensing (CS) signal estimation problem where an input signal is measured via a linear matrix multiplication under additive noise. While this setup usually assumes sparsity or compressibility in the input signal during recovery, the signal structure that can be leveraged is often not known a priori. In this paper, we consider universal CS recovery, where the statistics of a stationary ergodic signal source are estimated simultaneously with the signal itself. Inspired by Kolmogorov complexity and minimum description length, we focus on a maximum a posteriori (MAP) estimation framework that leverages universal priors to match the complexity of the source. Our framework can also be applied to general linear inverse problems where more measurements than in CS might be needed. We provide theoretical results that support the algorithmic feasibility of universal MAP estimation using a Markov chain Monte Carlo implementation, which is computationally challenging. We incorporate some techniques to accelerate the algorithm while providing comparable and in many cases better reconstruction quality than existing algorithms. Experimental results show the promise of universality in CS, particularly for low-complexity sources that do not exhibit standard sparsity or compressibility." @default.
• W2951447401 created "2019-06-27" @default.
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• W2951447401 date "2012-04-12" @default.
• W2951447401 modified "2023-09-24" @default.
• W2951447401 title "Recovery from Linear Measurements with Complexity-Matching Universal Signal Estimation" @default.
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• W2951447401 doi "https://doi.org/10.48550/arxiv.1204.2611" @default.
• W2951447401 hasPublicationYear "2012" @default.
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