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arXiv 1402.2864eess.SYcs.SYstat.ML
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从受扰线性超定系统中稀疏估计

Sparse Estimation From Noisy Observations of an Overdetermined Linear System

Uppsala University(乌普萨拉大学)

Liang Dai, Kristiaan Pelckmans

AI总结:

本文提出一种高效估计有限未知参数的方法,通过线性规划恢复支持集并利用LSE进行去偏差,证明在样本量足够时估计结果等于真实参数支持集的LSE。

摘要:

本文研究了一种从受高斯噪声扰动的线性方程中高效估计有限未知参数的方法。当未知参数仅有少数非零元素时,所提估计器比传统方法更高效。该方法包含三个步骤:(1) 经典的最小二乘估计(LSE),(2) 通过线性规划优化问题恢复支持集,该问题可通过软阈值化步骤计算,(3) 使用LSE在估计的支持集上进行去偏差。本文的主要贡献是正式推导了最终估计的关联ORACLE性质。即当样本量足够大时,估计结果被证明等于基于真实参数支持集的LSE。

英文摘要:

This note studies a method for the efficient estimation of a finite number of unknown parameters from linear equations, which are perturbed by Gaussian noise. In case the unknown parameters have only few nonzero entries, the proposed estimator performs more efficiently than a traditional approach. The method consists of three steps: (1) a classical Least Squares Estimate (LSE), (2) the support is recovered through a Linear Programming (LP) optimization problem which can be computed using a soft-thresholding step, (3) a de-biasing step using a LSE on the estimated support set. The main contribution of this note is a formal derivation of an associated ORACLE property of the final estimate. That is, when the number of samples is large enough, the estimate is shown to equal the LSE based on the support of the {\em true} 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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