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H{sub}∞ reduced-order approximation of 2-D digital filters

机译:H{sub}∞二维数字滤波器的降阶近似

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摘要

This paper considers the H{sub}∞ reduced-order approximation of two-dimensional (2-D) digital filters using the linear matrix inequality (LMI) approach. The 2-D digital filter is described by the 2-D Roesser model. We shall first establish LMI conditions for which a 2-D system is bounded real. This bounded realness property then allows us to derive solvability conditions for the 2-D H{sub}∞ reduced-order approximation which in general involves a nonconvex matrix rank minimization subject to LMI constraints. A numerical procedure is proposed to obtain a reduced-order H{sub}∞ approximation of the given 2-D filter using alternating projections. In particular, when a zeroth-order 2-D H{sub}∞ approximation is desired, it is shown that the approximation problem boils down to a convex LMI optimization problem. Numerical examples are given to demonstrate the proposed 2-D H{sub}∞ reduced-order approximation approach.
机译:本文考虑了使用线性矩阵不等式 (LMI) 方法对二维 (2-D) 数字滤波器进行 H{sub∞} 降阶近似。二维数字滤波器由二维 Roesser 模型描述。我们将首先建立 LMI 条件,其中二维系统是有界的实数。然后,这种有界真实性属性允许我们推导出二维 H{sub}∞ 降阶近似的可解性条件,这通常涉及受 LMI 约束的非凸矩阵秩最小化。提出了一种数值程序,利用交替投影获得给定二维滤波的降阶H{sub}∞近似值。特别是,当需要零阶二维 H{sub}∞ 近似时,表明近似问题归结为凸 LMI 优化问题。通过数值算例验证了所提出的二维H{sub}∞降阶逼近方法。

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