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arXiv 2105.03345eess.SP
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基于原子范数最小化的稀疏时频表示

Sparse time-frequency representation via atomic norm minimization

Tsubasa Kusano, Kohei Yatabe, Yasuhiro Oikawa

摘要:

非平稳信号的分析和处理通常在时频域进行,而时频域是通过离散Gabor变换(DGT)得到的。由于加窗的影响,DGT得到的T-F表示会发生扩展,从而降低T-F域分析和处理的性能。为了得到一个良好的局部化的T-F表示,稀疏意识的方法,使用$\ell_1$ -范数进行了研究。然而,他们需要将连续参数离散化到网格上,这会导致模型不匹配。在本文中,我们提出了一种方法来估计稀疏的T-F表示使用原子范数。原子范数使得稀疏优化无需连续参数的离散化。数值实验表明,该方法得到的T-F表示比传统方法更稀疏。

英文摘要:

Nonstationary signals are commonly analyzed and processed in the time-frequency (T-F) domain that is obtained by the discrete Gabor transform (DGT). The T-F representation obtained by DGT is spread due to windowing, which may degrade the performance of T-F domain analysis and processing. To obtain a well-localized T-F representation, sparsity-aware methods using $\ell_1$-norm have been studied. However, they need to discretize a continuous parameter onto a grid, which causes a model mismatch. In this paper, we propose a method of estimating a sparse T-F representation using atomic norm. The atomic norm enables sparse optimization without discretization of continuous parameters. Numerical experiments show that the T-F representation obtained by the proposed method is sparser than the conventional methods.

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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