Given a simply connected nilpotent Lie group having unitary irreducible representations that are square-integrable modulo the center, we use operator-valued periodization to give a range-function type characterization of shift-invariant spaces of function on the group. We then give characterizations of frame and Riesz families for shift-invariant spaces.
机构:
Sun Yat Sen Zhongshan Univ, Dept Math, Guangzhou 510275, Guangdong, Peoples R ChinaSun Yat Sen Zhongshan Univ, Dept Math, Guangzhou 510275, Guangdong, Peoples R China
Xian, Jun
Sun, Wenchang
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机构:
Nankai Univ, Dept Math, Tianjin 300071, Peoples R China
Nankai Univ, LPMC, Tianjin 300071, Peoples R ChinaSun Yat Sen Zhongshan Univ, Dept Math, Guangzhou 510275, Guangdong, Peoples R China