收录:
摘要:
The notion of vector-valued frame (also called superframe) was first introduced by Balan in the context of multiplexing. It has significant applications in mobile communication, satellite communication, and computer area network. For vector-valued Gabor analysis, existent literatures mostly focus on L-2 (R, C-L) instead of its subspace. Let a > 0, and S be an aZ-periodic measurable set in R (i.e. S + aZ = S). This paper addresses Gabor frames in L-2 (S,C-L) with rational time-frequency product. They can model vector-valued signals to appear periodically but intermittently. And the projections of Gabor frames in L-2 (R,C-L) onto L-2 (S,C-L) cannot cover all Gabor frames in L-2 (S,C-L) if S not equal R. By introducing a suitable Zak transform matrix, we characterize completeness and frame condition of Gabor systems, obtain a necessary and sufficient condition on Gabor duals of type I (resp. II) for a general Gabor frame, and establish a parametrization expression of Gabor duals of type I (resp. II). All our conclusions are closely related to corresponding Zak transform matrices. This allows us to easily realize these conclusions by designing the corresponding matrix-valued functions. An example theorem is also presented to illustrate the efficiency of our method. (C) 2014 Elsevier Inc. All rights reserved.
关键词:
通讯作者信息:
电子邮件地址: