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arXiv 1704.03286cs.ITmath.IT
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稀疏Wirtinger流相位恢复

Phase Retrieval via Sparse Wirtinger Flow

Ziyang Yuan, Qi Wang, Hongxia Wang

摘要:

相位恢复(PR)问题是一种病态反问题,在许多应用中都存在。在Wirtinger流方法的基础上,利用稀疏优先级,提出了一种稀疏Wirtinger流算法。该算法首先恢复信号的支持度,然后通过一个精心设计的初始化,用硬阈值方法更新估计值。理论分析表明,对于采样复杂度为$\mathcal{O}(k^2\mathrm{log}n)$的任意$k$稀疏$n$长度信号,该算法具有几何收敛性.为了得到$\varepsilon$的精度,迭代的计算复杂性为$\mathcal{O}(k^3n\mathrm{log}n\mathrm{log}\frac{1}{\varepsilon})$。数值试验还表明,ESTA执行更好的比国家的最先进的方法,特别是当我们没有先验知识的稀疏$k$。此外,该算法对噪声也具有较强的鲁棒性

英文摘要:

Phase retrieval(PR) problem is a kind of ill-condition inverse problem which can be found in various of applications. Utilizing the sparse priority, an algorithm called SWF(Sparse Wirtinger Flow) is proposed in this paper to deal with sparse PR problem based on the Wirtinger flow method. SWF firstly recovers the support of the signal and then updates the evaluation by hard thresholding method with an elaborate initialization. Theoretical analyses show that SWF has a geometric convergence for any $k$ sparse $n$ length signal with the sampling complexity $\mathcal{O}(k^2\mathrm{log}n)$. To get $\varepsilon$ accuracy, the computational complexity of SWF is $\mathcal{O}(k^3n\mathrm{log}n\mathrm{log}\frac{1}{\varepsilon})$. Numerical tests also demonstrate that SWF performs better than state-of-the-art methods especially when we have no priori knowledge about sparsity $k$. Moreover, SWF is also robust to the noise

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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