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A wavelet-like unconditional basis. (English) Zbl 0858.42020

Summary: We show that the orthogonal wavelet basis suitably normalized under the Wiener condition is an unconditional basis in \(L^p(\mathbb{R})\). This basis is a bounded Besselian basis in the space for \(1<p\leq 2\), and a bounded Hilbertian basis for \(2\leq p<\infty\). Under the Wiener condition, we show that the pre-wavelet basis with stable shift is a frame and we also construct the dual frame. We show that this frame provides an unconditional basis in \(L^p(\mathbb{R})\) \((1<p<\infty)\) using the Calderón-Zygmund operator.

MSC:

42C40 Nontrigonometric harmonic analysis involving wavelets and other special systems
46B04 Isometric theory of Banach spaces
46B15 Summability and bases; functional analytic aspects of frames in Banach and Hilbert spaces