Abstract
This paper addresses the theory of multi-window subspace Gabor frame with rational time-frequency parameter products. With the help of a suitable Zak transform matrix, we characterize multi-window subspace Gabor frames, Riesz bases, orthonormal bases and the uniqueness of Gabor duals of type I and type II. Using these characterizations we obtain a class of multi-window subspace Gabor frames, Riesz bases, orthonormal bases, and at the same time we derive an explicit expression of their Gabor duals of type I and type II. As an application of the above results, we obtain characterizations of multi-window Gabor frames, Riesz bases and orthonormal bases for L 2(ℝ), and derive a parametric expression of Gabor duals for multi-window Gabor frames in L 2(ℝ).
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Zhang, Y., Li, Y. Rational time-frequency multi-window subspace Gabor frames and their Gabor duals. Sci. China Math. 57, 145–160 (2014). https://doi.org/10.1007/s11425-013-4610-4
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DOI: https://doi.org/10.1007/s11425-013-4610-4