What is it about?
Necessary and sufficient conditions for the solutions of the positive real lemma equations in the discrete time without system-theoretic assumptions
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Why is it important?
Positive real lemma equations are the basis for Riccati equations, spectral factorization and Kalman filtering.
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This page is a summary of: Solvability conditions for the positive real lemma equations in the discrete time , IET Control Theory and Applications, August 2017, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-cta.2017.0314.
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