Computer Science > Information Theory
[Submitted on 5 Dec 2016 (v1), last revised 23 Oct 2018 (this version, v3)]
Title:Approximate Support Recovery of Atomic Line Spectral Estimation: A Tale of Resolution and Precision
View PDFAbstract:This work investigates the parameter estimation performance of super-resolution line spectral estimation using atomic norm minimization. The focus is on analyzing the algorithm's accuracy of inferring the frequencies and complex magnitudes from noisy observations. When the Signal-to-Noise Ratio is reasonably high and the true frequencies are separated by $O(\frac{1}{n})$, the atomic norm estimator is shown to localize the correct number of frequencies, each within a neighborhood of size $O(\sqrt{{\log n}/{n^3}} \sigma)$ of one of the true frequencies. Here $n$ is half the number of temporal samples and $\sigma^2$ is the Gaussian noise variance. The analysis is based on a primal-dual witness construction procedure. The obtained error bound matches the Cramér-Rao lower bound up to a logarithmic factor. The relationship between resolution (separation of frequencies) and precision or accuracy of the estimator is highlighted. Our analysis also reveals that the atomic norm minimization can be viewed as a convex way to solve a $\ell_1$-norm regularized, nonlinear and nonconvex least-squares problem to global optimality.
Submission history
From: Qiuwei Li [view email][v1] Mon, 5 Dec 2016 18:22:09 UTC (2,887 KB)
[v2] Mon, 24 Sep 2018 15:17:54 UTC (270 KB)
[v3] Tue, 23 Oct 2018 04:33:56 UTC (270 KB)
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