In this paper, a numerical method for solving the constrained optimal control of time-varying singular systems with quadratic performance index is presented. Presented method is based on Bernste in polynomials. Operational matrices of integration, differentiation and product are introduced and utilized to reduce the optimal control of time-varying singular problems to the solution of algebraic ...

In this paper, a robust autopilot is proposed using stable interpolation based on Youla parameterization. The most important condition of stable interpolation between local controllers is the preservation of stability so that each local controller can ensure stability for an open neighborhood around a nominal point. The proposed design used fixed-order robust controller with parameter-dependent...

We have already proposed novel robust parameter estimation algorithms of time-varying complex AR (TV-CAR) model for analytic speech signal, which are based on GLS (Generalized Least Square) and its modification of ELS (Extended Least Square). The ELS method is more sophisticated method that can be derived by matrix inversion theorem. We have shown that the methods can achieve robust speech spec...

Linear Parameter Varying (LPV) systems are models widely encountered in the engineering field. In this paper, a systematic method is provided to design a polytopic observer whose goal is to reconstruct the state of discrete-time LPV systems. The method incorporates in an original manner a minimal convex polytope finding and thereby confers efficiency to the reconstruction technique. The propose...

Demand of IP telephone is increasing more and more as broadband IP network is being commonly used by many people. In VoIP, packet loss concealment (PLC) is one of the key subjects to keep speech quality since packet loss occurs in IP network. PLC methods based on Linear Predictive coding (LP) method have been proposed in which LP coefficients and LP residual are repeated to recover speech corre...

In this paper we consider the problem of delay-dependent robustH1 control for uncertain fuzzy systems with time-varying delay. The Takagi–Sugeno (T–S) fuzzy model is used to describe such systems. Time-delay isassumed to have lower and upper bounds. Based on the Lyapunov-Krasovskiifunctional method, a sufficient condition for the existence of a robust $H_{infty}$controller is obtained. The fuzz...