On criteria for periodic wavelet frame

Abstract

We provide constructive necessary and sufficient conditions for a family of periodic wavelets to be a Parseval wavelet frame. The criterion generalizes unitary and oblique extension principles. It may be very useful for applications to signal processing because it allows to design any wavelet frame explicitly starting with refinable functions. The practically important case of one wavelet generator and refinable functions being trigonometric polynomials is discussed in details. As an application we study approximation properties of frames and give conditions for a coincidence of approximation orders provided by periodic multiresolution analysis and by a wavelet frame in terms of our criterion.