This paper is concerned with the function observer-based stabilization for time-varying delay systems with parameter uncertainties. The uncertain systems tackled in this paper involve uncertainty in quadratic constrained form which includes the well-known normbounded time-varying uncertainty as a special case. In terms of Razumikhin-type stability theorem, we show that the feasibility of severa...

The paper presents a state feedback stabilization method for uncertain systems subjected to parametric time-varying structured uncertainty. The proposed design approach also allows to obtain an imposed robust H ∞ performance with respect to the class of uncertainty considered. Necessary and sufficient conditions for the existence of such a state feedback control are derived in terms of the feas...

In this paper, the problem of adaptive iterative detection for Parallel Concatenated Convolutional Codes (PCCCs or turbo codes) in the presence of carrierphase uncertainty is examined. In particular, a subclass of adaptive iterative receivers, based on the Adaptive Soft-Input Soft-Output (A-SISO) algorithms proposed in [1], [2], is presented. Several design options are proposed and compared and...

In this paper, an approach for the computation of bounds on parametric model uncertainty for robust control design is proposed. The approach uses μ sensitivities to identify which uncertain parameters in the model are most critical in terms of closed-loop robustness objectives. Using skewed μ analysis tools, the maximum possible uncertainty bounds for model parameters which are most difficult o...

Robustness analysis is considered for systems with structured uncertainty involving a combination of linear time-invariant and linear time-varying perturbations, and parametric uncertainty. A necessary and suucient condition for robust stability in terms of the structured singular value is obtained, based on a nite augmentation of the original problem. The augmentation corresponds to considerin...

In this paper, we propose a method to design robust sliding hyperplanes in the presence of mismatched parametric uncertainty based on quadratic stability. The robust sliding hyperplane is constructed from a Riccati inequality associated with quadratic stabilizability. The proposed method enables us to deal with structured uncertainty and optimize the sliding motion by applying the guaranteed co...

Robustness analysis is considered for systems with structured uncertainty involving a combination of linear time-invariant and linear time-varying perturbations, and parametric uncertainty. A necessary and sufficient condition for robust stability in terms of the structured singular value p is obtained, based on a finite augmentation of the original problem. The augmentation corresponds to cons...

The robust servomechanism problem consists in finding an LTI controller for the plant so that: (i) the resultant closed-loop system is asymptotically stable, (ii) asymptotic tracking occurs, and (iii) condition (ii) holds any arbitrary perturbation in the plant model (parametric uncertainty or dynamic uncertainty, including changes in model order) that do not cause the resultant closed-loop sys...

This paper presents an approach to controller design in the complex plain, satisfying some performance specifications and an analysis of the obtained system in the presence of parametric uncertainty. The relative location of regions in the complex plane, specifying performance and uncertainty, is analyzed. Transient responses and the notion of robustness are commented. The design example, shown...

This paper addresses the issue of modelling the uncertainty about the value of continuous soil Ž . attributes, at any particular unsampled location local uncertainty as well as jointly over several Ž . locations multiple-point or spatial uncertainty . Two approaches are presented: kriging-based and Ž . simulation-based techniques that can be implemented within a parametric e.g. multi-Gaussian o...