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arXiv 0901.4386math.FAmath-phmath.MP
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多解析函数Bargmann-Fock空间的采样与插值

Sampling and interpolation in Bargmann-Fock spaces of polyanalytic functions

Luis Daniel Abreu

摘要:

利用Gabor分析,我们给出了多解析函数Fock空间中所有格点采样和插值序列的一个完整刻画,并显示出随空间的多解析度$n$而增加的“Nyquist速率”.这些条件等价于某些向量值Gabor系统的锐格密度条件,即超框架和带Hermite窗的Gabor超Riesz序列,在超框架的情况下,它们最近由Gröchenig和Lyubarskii研究。我们的主要结果的证明使用的Janssen-Ron-Shen对偶原理的变化,并揭示了一个二元之间的采样和插值的多解析空间,多重插值和采样的解析空间。为了连接这些主题,我们引入了\emph{polyanalytic Bargmann transform},向量值希尔伯特空间和多解析Fock空间之间的酉映射,它将Bargmann变换扩展到多解析空间。出于这种联系,我们讨论了向量值版本的Gabor变换。这些想法在信号多路复用的上下文中具有自然的应用。我们还指出,Balan,Casazza和Landau关于Gabor框架密度的一个最近结果,对带Hermite窗的Gabor框架密度的Gröchenig-Lyubarskii猜想有重要的影响.

英文摘要:

Using Gabor analysis, we give a complete characterization of all lattice sampling and interpolating sequences in the Fock space of polyanalytic functions, displaying a "Nyquist rate" which increases with $n$, the degree of polyanaliticity of the space. Such conditions are equivalent to sharp lattice density conditions for certain vector-valued Gabor systems, namely superframes and Gabor super-Riesz sequences with Hermite windows, and in the case of superframes they were studied recently by Gröchenig and Lyubarskii. The proofs of our main results use variations of the Janssen-Ron-Shen duality principle and reveal a duality between sampling and interpolation in polyanalytic spaces, and multiple interpolation and sampling in analytic spaces. To connect these topics we introduce the\emph{polyanalytic Bargmann transform}, a unitary mapping between vector valued Hilbert spaces and polyanalytic Fock spaces, which extends the Bargmann transform to polyanalytic spaces. Motivated by this connection, we discuss a vector-valued version of the Gabor transform. These ideas have natural applications in the context of multiplexing of signals. We also point out that a recent result of Balan, Casazza and Landau, concerning density of Gabor frames, has important consequences for the Gröchenig-Lyubarskii conjecture on the density of Gabor frames with Hermite windows.

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