Electrical and Electronic Engineering - Research Publications
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ItemOn the use of switched linear controllers for stabilizability of implicit recursive equations(IEEE, 1998-01-01)Stabilizability of implicit recursive equations is investigated. These equations arise naturally in the context of output dead-beat control for systems described by NARMAX models. Due to non-uniqueness of the solutions of these equations a special kind of a constrained stabilizability problem is considered. We take a hybrid switching control approach in testing the existence of a locally stabilizing controller. A method for the design of a stabilizing switching controller is also presented.
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ItemAnalysis of minimum phase properties for non-affine nonlinear systems(IEEE, 1997)A system can be termed non-minimum phase according to some definitions available in the literature and yet the same system may exhibit stable zero output constrained dynamics. We show that for non-affine nonlinear systems there may not exist a continuous control law which would keep the output identically equal to zero and for which the zero output constrained dynamics are stable, whereas a discontinuous controller which achieves this exists. We give conditions for existence and present a method for design of discontinuous switching controllers which yield stable zero dynamics. In this sense, the results of this paper enlarge the class of non-affine nonlinear systems that can be termed minimum-phase.
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ItemMinimum phase properties for input nonaffine nonlinear systems(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-04)For input nonaffine nonlinear control systems, the minimum phase property of the system in general depends on the control law. Switching or discontinuous controllers may offer advantages in this context. In particular, there may not exist a continuous control law which would keep the output identically equal to zero and for which the zero output constrained dynamics are locally stable, whereas a discontinuous controller which achieves this exists. For single-input/single-output input nonaffine nonlinear systems we give sufficient conditions for existence and present a method for the design of discontinuous switching controllers which yield locally stable zero dynamics.
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ItemOptimum design for coherent optical OFDM transmitter(IEEE, 2007-01-01)
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ItemCharacterization of the 60 GHz wireless desktop channel(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-07)
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ItemOPTIMAL INFINITE HORIZON CONTROL UNDER A LOW DATA RATE 2(Elsevier BV, 2006)
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ItemA DATA-RATE LIMITED VIEW OF ADAPTIVE CONTROL(Elsevier BV, 2006)
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ItemFinite horizon LQ optimal control and computation with data rate constraints(IEEE - Institute of Electrical and Electronic Engineers, 2005)
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ItemFeedback control under data rate constraints: An overview(INSTITUTE OF ELECTRICAL ELECTRONICS ENGINEERS (IEEE), 2007)The emerging area of control with limited data rates incorporates ideas from both control and information theory. The data rate constraint introduces quantization into the feedback loop and gives the interconnected system a two-fold nature, continuous and symbolic. In this paper, we review the results available in the literature on data-rate-limited control. For linear systems, we show how fundamental tradeoffs between the data rate and control goals, such as stability, mean entry times, and asymptotic state norms, emerge naturally. While many classical tools from both control and information theory can still be used in this context, it turns out that the deepest results necessitate a novel, integrated view of both disciplines.