Multirate systems and filter banks
Multirate systems and filter banks
Robust and optimal control
Approximation of Large-Scale Dynamical Systems (Advances in Design and Control) (Advances in Design and Control)
Analysis of Second-Order Modes of Linear Discrete-Time Systems under Bounded-Real Transformations
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
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This paper proposes the Gramian-preserving frequency transformation for linear discrete-time state-space systems. In this frequency transformation, we replace each delay element of a discrete-time system with an allpass system that has a balanced realization. This approach can generate transformed systems that have the same controllability/observability Gramians as those of the original system. From this result, we show that the Gramian-preserving frequency transformation gives us transformed systems with different magnitude characteristics, but with the same structural property with respect to the Gramians as that of the original system. This paper also presents a simple method for realization of the Gramian-preserving frequency transformation. This method makes use of the cascaded normalized lattice structure of allpass systems.