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IEEE Conference on Decision and control

作者： C. Barbu R. Sepulchre Wei Lin P.V. Kokotovic Department of Electrical and Computer Engineering University of California Santa Barbara CA USA Center for Systems Engineering and Applied Mechanics Universite Catholique de Louvain Louvain-la-Neuve Belgium Department of Systems Control and Industrial Engineering Case Western Reserve University Cleveland OH USA

For the well known ball-and-beam system, we design a new saturation control law, which employs state-dependent saturation levels and guarantees global asymptotic stability, not achieved with previous designs.

关键词： control systems Stability Force control Force feedback Friction Nonlinear control systems control nonlinearities Angular velocity Nonlinear equations Acceleration

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Non-Wiener effects in LMS-implemented adaptive equalizers

Non-Wiener effects in LMS-implemented adaptive equalizers

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： M. Reuter J. Zeidler Department of Electrical and Computer Engineering University of California San Diego CA USA Control and Ocean Surveillance Center RDT&E Division Naval Command San Diego CA USA

An adaptive transversal equalizer based upon the least-mean-square (LMS) algorithm, operating in an environment with temporally correlated interference can exhibit better steady-state mean-square-error (MSE) performance than the corresponding Wiener filter. This phenomenon is a result of the nonlinear nature of the LMS algorithm and is obscured by traditional analysis approaches that utilize the independence assumption. We use a transfer function approach to quantify the MSE performance of the LMS algorithm and demonstrate that the degree to which LMS may outperform the corresponding Wiener filter is dependent on system parameters such as signal-to-noise ratio and the step-size parameter.

关键词： Adaptive equalizers Least squares approximation Wiener filter Adaptive filters Interference Steady-state Transfer functions Noise cancellation Oceans Surveillance

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Probability of error evaluation for multichannel reception of coherent MPSK over Ricean fading channels

Probability of error evaluation for multichannel reception o...

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IEEE International Conference on Communications (ICC)

作者： T.L. Staley R.C. North W.H. Ku J.R. Zeidler Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA RDT&E Division (NRaD) Naval Command Control and Ocean Surveillance Center San Diego CA USA

This paper presents a recursive method for evaluating the error rate performance of multichannel reception of coherent MPSK systems operating over slowly Ricean fading channels. Each of the multiple channels is assumed to be a bandlimited two-sided discrete path model with complex Gaussian taps. The main path is assumed to be non-zero mean, corresponding to Ricean fading. Maximal ratio combining in the receiver is assumed, and an expression for the received phase density function is developed. A recursive method for solving the resulting error probability expression is then presented. This method is similar to those used for recursive computation of the Marcum Q function, and is both efficient and accurate. The method can be applied for both the flat and frequency selective Ricean fading cases. Examples based on a ship to ship high-data-rate line-of-sight channel model are provided to demonstrate the method.

关键词： Fading Statistics Bandwidth Band pass filters Receiving antennas Diversity reception Probability Error correction Gaussian channels Random variables

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Tracking controllers for systems linear in the unmeasured states

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AUTOMATICA 1996年第5期32卷 735-746页

作者： Freeman, RA Kokotovic, PV [a] Center for Control Engineering and Computation Department of Electrical and Computer Engineering University of California Santa Barbara CA 93106 U.S.A.

We introduce a class of extended strict feedback nonlinear systems in which unmeasured states enter the system equations in a linear (affine) fashion. For such systems, we present a procedure for constructing dynamic partial state feedback controllers that achieve the global asymptotic tracking of given reference trajectories while maintaining internal boundedness. The controller dynamic order is equal to the number of unmeasured states. To illustrate our design procedure, we construct such a tracking controller for a nonlinear electromechanical rotor/platform system. Copyright (C) 1996 Elsevier Science Ltd.

关键词： nonlinear systems global stability tracking disturbance rejection dynamic output feedback Lyapunov methods

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Design and implementation of fuzzy controllers for complex systems - case study: a water desalination plant

Design and implementation of fuzzy controllers for complex s...

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Proceedings of ISAI/IFIS Mexico-USA Collaboration in Intelligent Systems Technologies

作者： M. Jamshidi M.-R. Akbarzadeh K. Kumbla NASA Center for Autonomous Control Engineering (ACE) Electrical and Computer Engineering Building University of New Mexico Albuquerque NM USA

Two soft computing paradigms for automated learning control of complex systems are briefly de scribed. To illustrate the utility of the paradigms, they are applied to a desalination process and sim ulations are performed. The first paradigm in corporates Genetic Algorithms (GA) in a learn ing scheme to adapt parameters of the fuzzy controller to changing environmental conditions. The second paradigm concentrates on a methodology which uses a Neural Network (NN) to adapt a fuzzy logic controller. Simulation results of fuzzy controllers learned with the aid of these soft computing paradigms are presented.

关键词： Fuzzy control Fuzzy systems control systems computer aided software engineering Desalination Fuzzy logic Automatic control Neural networks Robust control Genetic algorithms

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On Genetic Programming of Fuzzy Rule-Based Systems for Intelligent control

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Intelligent Automation and Soft Computing 1996年第3期2卷 271-284页

作者： Tunstel, Edward Jamshidi, Mo NASA Center for Autonomous Control Engineering Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM 87131 United States NASA/Jet Propulsion Laboratory Pasadena CA United States

Fuzzy logic and evolutionary computation have proven to be convenient tools for handling real-world uncertainty and designing control systems, respectively. An approach is presented that combines attributes of these paradigms for the purpose of developing intelligent control systems. The potential of the genetic programming paradigm (GP) for learning rules for use in fuzzy logic controllers (FLCs) is evaluated by focussing on the problem of discovering a controller for mobile robot path tracking. Performance results of incomplete rule-bases compare favorably to those of a complete FLC designed by the usual trial-and-error approach. A constrained syntactic representation supported by structure-preserving genetic operators is also introduced. © 1996 Taylor & Francis Group, LLC.

关键词： Fuzzy control Genetic programming Mobile robots Rule-base discovery Syntactic constraints

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Nonlinear control of swing-up inverted pendulum

Nonlinear control of swing-up inverted pendulum

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IEEE Conference on control Technology and Applications (CCTA)

作者： W. Torres-Pomales O.R. Gonzalez NASA-Langley Research Center Hampton VA USA Department of Electrical and Computer Engineering Old Dominion University Norfolk VA USA

This paper presents plant modeling, analysis, and nonlinear control design and implementation for swing-up, pendulum regulation, and arm tracking of a rotational inverted pendulum plant. For the ideal case, the equilibrium states are characterized. It is shown, for example, that the pendulum cannot be kept at a fixed angle above the horizontal except in a vertical position. The control design centers on the pendulum regulation and arm tracking controllers. A sliding mode and a variable-gain PID controllers are chosen for regulation and tracking. Due to the strong coupling of the arm and pendulum dynamics, a 2DOF control configuration was used. A simple technique was used to swing-up the pendulum to within the region of attraction of the regulation controller. Results of computer simulations and laboratory photos are presented.

关键词： Sliding mode control Laboratories Nonlinear equations control design Mechanical variables control Actuators State feedback Optimal control Linear feedback control systems Switches

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Deposition and X-ray photoelectron spectroscopy studies on sputtered cerium dioxide thin films

Deposition and X-ray photoelectron spectroscopy studies on s...

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IEEE Southeastcon

作者： K.B. Sundaram P.F. Wahid O. Melendez Department of Electrical and Computer Engineering University of Central Florida Orlando FL USA Microchemical Analysis NASA The John F Kennedy Space Center FL USA

Cerium dioxide is a rare earth oxide material which may be useful for various optical and electronic applications because of its high refractive index and dielectric constant. Cerium dioxide thin films were deposited on to glass substrates using r.f. magnetron sputtering. A cerium dioxide target was used for sputtering and films were deposited for various oxygen-argon gas flow ratios under different sputtering power levels. X-ray photoelectron spectroscopy analysis were performed on these films and the results are presented in terms of deposition conditions.

关键词： Spectroscopy Sputtering Cerium Optical films Dielectric materials Magnetic materials Optical materials Optical refraction Optical variables control Refractive index

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Performance of coherent MPSK on frequency selective slowly fading channels

Performance of coherent MPSK on frequency selective slowly f...

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IEEE Conference on Vehicular Technology (VTC)

作者： T.L. Staley R.C. North W.H. Ku J.R. Zeidler Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA RDT&E Division Naval Command Control and Ocean Surveillance Center San Diego CA USA

This paper presents a framework for analyzing the error rate performance of multichannel coherent reception of MPSK systems operating over frequency selective, slowly fading channels. Each of the baseband channels is assumed to be a bandlimited two-sided discrete path model with correlated complex Gaussian taps, which is assumed to have resulted from an underlying Gaussian wide-sense-stationary uncorrelated-scattering (WSSUS) physical channel followed by a lowpass filter. By working with this "resolved channel", the resulting performance evaluation incorporates whatever resolution is inherent in the bandwidth of interest. An expression for the received phase density function is developed. The probability of symbol error, conditioned on the interfering symbols, is then determined, and the cases for which a closed form or efficient numerical evaluation is possible are specified. The symbol error rate is then obtained by summing over the interfering symbols. A progressive ISI bound is then discussed for cases when faster computation is required. Examples are then provided to demonstrate the versatility of the method.

关键词： Frequency Fading Error analysis Phase shift keying Bandwidth Pulse shaping methods Performance analysis Density functional theory Signal resolution Oceans

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Channel estimate-based performance prediction for coherent linear modulation on slowly fading channels

Channel estimate-based performance prediction for coherent l...

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MILCOM, Military Communications Conference

作者： T.L. Staley R.C. North R.A. Axford W.H. Ku J.R. Zeidler Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA RDT&E Division NRaD Naval Command Control and Ocean Surveillance Center San Diego CA USA

This paper describes a framework for predicting the error rate performance of linearly modulated coherent systems operating over frequency selective, slowly fading channels, when the statistics of the bandlimited two-sided discrete FIR model for the channel are available from a channel estimator. This work supports an upcoming experiment in which channel estimates obtained with one modulation scheme will be used to predict the performance of higher order modulation schemes. The focus of this paper is the mathematical framework for the theoretical performance prediction. Linear memoryless modulation is assumed, providing a a very general signal model that includes M-PSK and M-QAM. The channel model is slowly fading, with correlated complex Gaussian taps, incorporating both the flat and frequency selective cases. Expressions for the error probability are presented, and the cases for which closed form or acceptable numerical solutions exist are delineated. A new recursive method for solving the Rician-fading main path case is presented. The high-data-rate maritime line-of-sight channel is used to demonstrate the use fullness of the method.

关键词： Fading Chirp modulation Error analysis Rayleigh channels Frequency estimation Pulse shaping methods Higher order statistics Amplitude modulation Quadrature amplitude modulation Pulse modulation

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