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arXiv 2008.07238math.FA
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基于格点测量的Gabor相位恢复的内射性

Injectivity of Gabor phase retrieval from lattice measurements

Philipp Grohs, Lukas Liehr

摘要:

我们建立了新的独特性结果的Gabor相位恢复问题:如果$\mathcal{G} : L^2(\mathbb{R}) \to L^2(\mathbb{R}^2)$表示的Gabor变换,然后每个$f \in L^4[-\tfrac{c}{2},\tfrac{c}{2}]$确定到一个全球性的相位值$|\mathcal{G}f(x,ω)|$其中$(x,ω)$是点的晶格$b^{-1}\mathbb{Z} \times (2c)^{-1}\mathbb{Z}$和$b>0$是一个任意的正常数。这是第一次表明,紧支撑,复值函数可以唯一地重建从格样本的频谱图。此外,利用Gröchenig,Romero和Stöckler关于移位不变空间中采样的最新发展,我们证明了具有高斯生成元的移位不变空间中函数的类似唯一性结果.非均匀采样的推广。最后,我们比较我们的结果的情况下,所考虑的信号被假定为实值。

英文摘要:

We establish novel uniqueness results for the Gabor phase retrieval problem: if $\mathcal{G} : L^2(\mathbb{R}) \to L^2(\mathbb{R}^2)$ denotes the Gabor transform then every $f \in L^4[-\tfrac{c}{2},\tfrac{c}{2}]$ is determined up to a global phase by the values $|\mathcal{G}f(x,ω)|$ where $(x,ω)$ are points on the lattice $b^{-1}\mathbb{Z} \times (2c)^{-1}\mathbb{Z}$ and $b>0$ is an arbitrary positive constant. This for the first time shows that compactly-supported, complex-valued functions can be uniquely reconstructed from lattice samples of their spectrogram. Moreover, by making use of recent developments related to sampling in shift-invariant spaces by Gröchenig, Romero and Stöckler, we prove analogous uniqueness results for functions in shift-invariant spaces with Gaussian generator. Generalizations to nonuniform sampling are also presented. Finally, we compare our results to the situation where the considered signals are assumed to be real-valued.

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