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arXiv 1306.5037math.FA
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非平稳Gabor框架及其对偶系统的结构

Structure of nonstationary Gabor frames and their dual systems

Nicki Holighaus

摘要:

研究了非平稳Gabor框架对偶系统的结构性质。特别是,我们证明了一些逆非平稳Gabor框架运营商承认核桃样表示,即运营商作用于一个功能可以描述该功能的加权平移,即使当原来的框架运营商不是对角。在这种情况下,这只发生在使用compatible支持的窗口函数时,规范的对偶框架部分继承了原始框架的结构,我们详细描述了差异。此外,我们还确定了一对非平稳Gabor框架构成对偶框架的充分条件。在一些弱的限制条件下,证明了该条件与所涉及系统的对偶性的等价性。然后在一个简单的设置,证明了存在的对偶对的非对角框架算子的非平稳Gabor系统。讨论的结果,仅限于经典的情况下,经常Gabor系统,之前的声明的一般结果。在这里,我们还探讨了与Christensen,Kim和Kim最近在Gabor框架上的工作的联系,这些框架具有compatible支持的窗口函数。

英文摘要:

We investigate the structural properties of dual systems for nonstationary Gabor frames. In particular, we prove that some inverse nonstationary Gabor frame operators admit a Walnut-like representation, i.e. the operator acting on a function can be described by weighted translates of that function, even when the original frame operator is not diagonal. In this case, which only occurs when compactly supported window functions are used, the canonical dual frame partially inherits the structure of the original frame, with differences that we describe in detail. Moreover, we determine a sufficient condition for a pair of nonstationary Gabor frames to form dual frames. The equivalence of this condition to the duality of the involved systems is shown under some weak restrictions. It is then applied in a simple setup, to prove the existence of dual pairs of nonstationary Gabor systems with non-diagonal frame operator. A discussion of the results, restricted to the classical case of regular Gabor systems, precedes the statement of the general results. Here, we also explore a connection to recent work of Christensen, Kim and Kim on Gabor frames with compactly supported window function.

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