离散向量值非均匀Gabor框架
Discrete Vector-Valued Nonuniform Gabor Frames
摘要：
Gabor框架因其在时频分析，特别是信号处理中的潜在应用而引起了许多数学家和物理学家的兴趣。Gabor系统是通过将调制和移位算子应用于信号空间中的非零函数而获得的向量的集合。在许多应用中，例如，与Gabor系统相关的信号处理，对应的移位可能不是均匀的。也就是说，与移位相关联的集合可能不是通常加法下的群。在离散向量值非均匀信号空间中分析离散向量值非均匀Gabor框架（简称DVNUG框架），其中与移位相关的索引集可能不是通常加法下的实数子群，而是基于谱偶理论的谱.首先，我们给出了离散向量值非均匀信号空间中DVNUG Bessel序列存在的充要条件。我们提供了离散向量值非均匀信号空间中DVNUG框架的一个特征。证明了离散向量值非均匀Gabor系统的DVNUG框架在窗口序列的小扰动下是稳定的。我们观察到，算术平均序列与一个给定的DVNUG框架的窗口序列共同构成一个离散的非均匀的Gabor框架。最后，我们讨论了DVNUG系统的窗口序列和它们对应的坐标之间的相互作用。
英文摘要：
Gabor frames have interested many mathematicians and physicists due to their potential applications in time-frequency analysis, in particular, signal processing. A Gabor system is a collection of vectors which is obtained by applying modulation and shift operators to non-zero functions in signal spaces. In many applications, for example, signal processing related to Gabor systems, the corresponding shifts may not be uniform. That is, the set associated with shifts may not be a group under usual addition. We analyze discrete vector-valued nonuniform Gabor frames (DVNUG frames, in short) in discrete vector-valued nonuniform signal spaces, where the indexing set associated with shifts may not be a subgroup of real numbers under usual addition, but a spectrum which is based on the theory of spectral pairs. First, we give necessary and sufficient conditions for the existence of DVNUG Bessel sequences in discrete vector-valued nonuniform signal spaces in terms of Fourier transformations of the modulated window sequences. We provide a characterization of DVNUG frames in discrete vector-valued nonuniform signal spaces. It is shown that DVNUG frames are stable under small perturbation of window sequences associated with given discrete vector-valued nonuniform Gabor systems. We observed that the arithmetic mean sequences associated with window sequences of a given DVNUG frame collectively constitutes a discrete nonuniform Gabor frame. Finally, we discuss an interplay between window sequences of DVNUG systems and their corresponding coordinates.
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