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arXiv 1610.04067math.FA
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$L^2(\mathbb{R})$中广义移不变系统的显式构造和性质

Explicit constructions and properties of generalized shift-invariant systems in $L^2(\mathbb{R})$

Ole Christensen, Marzieh Hasannasab, Jakob Lemvig

摘要:

广义移不变系统(GSI)最初由Hernández,Labate & Weiss和Ron & Shen提出,为分析Gabor系统,小波系统,波包系统和其他类型的结构函数系统提供了一个通用的框架。在本文中,我们分析了这种系统的三个重要方面。首先,在对比的情况下,已知的Gabor框架和小波框架,我们表明,GSI系统形成一个框架,Calderón和不一定是有界的框架下界。我们确定了一个技术条件,这意味着卡尔德龙和有界的下框架界,并表明,在一个弱的假设下,该条件是等价的局部可积性条件介绍了埃尔南德斯等人。第二,我们提供明确的和一般的结构框架和对偶对框架的GSI结构。特别是,该设置适用于波包系统,并在文献中的结构相反,这些结构不是基于在傅立叶域中的特征函数。第三,我们的结果提供了深入了解局部可积性条件(LIC)。

英文摘要:

Generalized shift-invariant (GSI) systems, originally introduced by Hernández, Labate & Weiss and Ron & Shen, provide a common frame work for analysis of Gabor systems, wavelet systems, wave packet systems, and other types of structured function systems. In this paper we analyze three important aspects of such systems. First, in contrast to the known cases of Gabor frames and wavelet frames, we show that for a GSI system forming a frame, the Calderón sum is not necessarily bounded by the lower frame bound. We identify a technical condition implying that the Calderón sum is bounded by the lower frame bound and show that under a weak assumption the condition is equivalent with the local integrability condition introduced by Hernández et al. Second, we provide explicit and general constructions of frames and dual pairs of frames having the GSI-structure. In particular, the setup applies to wave packet systems and in contrast to the constructions in the literature, these constructions are not based on characteristic functions in the Fourier domain. Third, our results provide insight into the local integrability condition (LIC).

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