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arXiv 2103.01551cs.ITeess.SPmath.IT
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从其高阶谱的几次线性测量中恢复信号

Signal recovery from a few linear measurements of its high-order spectra

Tamir Bendory, Dan Edidin, Shay Kreymer

摘要:

$q$阶谱是信号$x\in\mathbb{C}^N$的条目中的次数为$q$的多项式,其在信号的循环移位下是不变的。对于$q\geq 3$,该多项式唯一地确定信号,直到循环移位,并且被称为高阶谱。高阶谱,特别是双谱($q=3$)和三谱($q=4$),在各种统计信号处理和成像应用中,例如相位恢复和单粒子重建中起着重要作用。然而,$q$阶谱的维数是$N^{q-1}$,远远超过了$x$的维数,导致计算负荷和存储要求增加.在这项工作中,我们表明,它是不必要的存储和处理的全部高阶谱:信号可以被描述为唯一的,对称性,从只有$N+1$线性测量其高阶谱。证明依赖于代数几何的工具,并通过数值实验得到证实。

英文摘要:

The $q$-th order spectrum is a polynomial of degree $q$ in the entries of a signal $x\in\mathbb{C}^N$, which is invariant under circular shifts of the signal. For $q\geq 3$, this polynomial determines the signal uniquely, up to a circular shift, and is called a high-order spectrum. The high-order spectra, and in particular the bispectrum ($q=3$) and the trispectrum ($q=4$), play a prominent role in various statistical signal processing and imaging applications, such as phase retrieval and single-particle reconstruction. However, the dimension of the $q$-th order spectrum is $N^{q-1}$, far exceeding the dimension of $x$, leading to increased computational load and storage requirements. In this work, we show that it is unnecessary to store and process the full high-order spectra: a signal can be characterized uniquely, up to symmetries, from only $N+1$ linear measurements of its high-order spectra. The proof relies on tools from algebraic geometry and is corroborated by numerical experiments.

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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