Robust stability and performance via fixed-order dynamic compensation: the discrete-time case

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Abstract
-discrete-time feedback control-design problem involving parametric uncertainty is considered. A quadratic bound suggested by recent work on discrete-time state space H, theory is utilized in con- junction with the guaranteed cost approach to guarantee robust stability with a robust performance bound. The principal result involves suffi- cient conditions for characterizing robust full- and reduced-order con- trollers with a worst case H2 performance bound.