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13th International Zurich Seminar on Digital Communications, 1994

作者： Siveski, Zoran Bar-Ness, Yeheskel Chen, David W. Center for Communications and Signal Processing Electrical and Computer Engineering Department New Jersey Institute of Technology University Heights NewarkNJ07102 United States Delft University of Technology Faculty of Electrical Engineering Telecommunications and Traffic-Control Systems Group Delft Netherlands Center for Communications and Signal Processing Research NJIT NewarkNJ07102 United States

ISBN: (纸本)9783540578567

A two-stage multiuser detector for the code division multiple access environment employing a combination of a decorrelator and a nonlinear multiuser interference canceler is considered. The weights of the canceler are adaptively adjusted, thus rendering the knowledge of the received signal energies unnecessary. The probability of error is evaluated and compared to those of the decorrelator and a similar two-stage, fixed-weights scheme which requires an estimation of signal energies. © Springer-Verlag Berlin Heidelberg 1994.

关键词： Code division multiple access

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Magnetic Bearing control Systems and Adaptive Forced Balancing

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IEEE control Systems 1994年第2期14卷 4-13页

作者： Shafai, B. Beale, S. LaRocca, P. Cusson, E. Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 United States Brooks Automation Lowell MA 01851 United States Circuit Design and Applied Control Division MS 29 The Charles Stark Draper Laboratory Inc. Cambridge MA 02139 555 Technology Square United States

Active magnetic bearing (AMB) actuators support rotors without friction but require feedback control for stabilization and performance. We address the application of modern control techniques such as LQG/LTR, H/spl infin/, and QFT to AMB systems. We also introduce a novel method called adaptive forced balancing (AFB) which solves the problem of synchronous vibration caused by mass unbalance. Simulation and experimental results are included to show the performance of AFB as applied to single-end AMB suspensions (SISO systems). Finally, AFB with frequency tracking and its generalization for double-end AMB suspensions (MIMO systems) are briefly explored. © 1994 IEEE

关键词： Magnetic levitation Force control control systems Adaptive systems Programmable control Adaptive control Suspensions Actuators Friction Feedback control

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New results on H/sub 2/ suboptimal state feedback control with an H/sub /spl infin// constraint

New results on H/sub 2/ suboptimal state feedback control wi...

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American control Conference (ACC)

作者： E. Nobuyama P.P. Khargonekar Department of Control Engineering and Science Kyushu Institute of Technology Iizuka Fukuoka Japan Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

In this paper, we consider an H/sub 2/ suboptimal control problem with H/sub /spl infin// constraint. The problem is formulated as one of finding an internally stabilizing controller which achieves the prescribed H/sub 2/ norm of a closed-loop transfer matrix, subject to a constraint on the H/sub /spl infin// norm of some other closed-loop transfer matrix. We give a sufficient condition for solving this problem. Moreover, using the result, we present a design algorithm for finding an internally stabilizing controller which achieves the H/sub 2/ performance better than the central H/sub /spl infin// controller. It is assumed that the state of the plant is available for feedback.

关键词： State feedback Sufficient conditions Optimal control Strain control Robust stability Riccati equations Cost function Centralized control control systems control engineering

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ERROR PERFORMANCE OF SYNCHRONOUS MULTIUSER CODE-DIVISION MULTIPLE-ACCESS DETECTOR WITH MULTIDIMENSIONAL ADAPTIVE CANCELER

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EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS 1994年第6期5卷 719-724页

作者： SIVESKI, Z BARNESS, Y CHEN, DW Center for Communications and Signal Processing Electrical and Computer Engineering Department New Jersey Institute of Technology University Heights Newark NJ 07102 - USA Was on sabbatical with Delft University of Technology Faculty of Electrical Engineering Telecommunications and Traffic-Control Systems Group Delft - The Netherlands.

A code division multiple access detector that employs a combination of a decorrelator and a multidimensional interference canceler is considered. The weights of the canceler are adaptively controlled using a steepest descent algorithm. The probability of error is evaluated and compared to those of the decorrelating detector and a similar, fixed-weights scheme that requires an estimation of received signal energies. It is shown that the proposed two-stage detector provides substantial improvement over the decorrelating detector, particularly in the presence of strong interfering signals. This is especially noticeable in the high bandwidth efficiency cases. It is also observed that in the presence of weak interferers, the proposed scheme performs better than its fixed-weights counterpart.

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A Simulation, Environment for Eyaluation of Kowledge Based Fault Diagnosis Systems

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IFAC Proceedings Volumes 1994年第10期27卷 59-64页

作者： Alenka Žnidaršič Victor J. Terpstra Henk B. Verbruggen Jožef Stefan Institute Department of Computer Automation and Control Jamova 39 61111 Ljubljana Slovenia Delft University of Technology Department of Electrical Engineering. Control Laboratory P.O. Box 5031. 2600 GA Delft The Netherlands

In the paper a simulation environment for evaluation of knowledge based fault diagnostic systems is presented. The contribution deals with the concept of the environment that provides an integration of qualitative and quantitative models. This concept is presented on a simulated water-column process controlled by feedback. The simulation environment is used to evaluate the potentials of Multilevel Flow Modelling (MFM) approach to system diagnosis. The environment is realized within the real-time expert system tool G2.

关键词： Fault diagnosis multilevel flow models simulation model-based reasoning

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Towards a coordinated development of numerical CACSD software: the RASP/SLICOT compatibility concept

Towards a coordinated development of numerical CACSD softwar...

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IEEE International Symposium on computer Aided control System Design (CACSD)

作者： G. Grubel A. Varga A. van den Boom A.J. Geurts Control Design Engineering Institute for Robotics and System Dynamics DLR-Oberpfaffenhofen Wessling Germany Department of Electrical Engineering Eindhovan University of Technology Eindhoven Netherlands Department of Mathematics & Computer Science Eindhovan University of Technology Eindhoven Netherlands

The concept of mutual compatibility is introduced. It has arisen from the cooperation of the developers of the RASP and SLICOT libraries. With this concept it becomes feasible to coordinate the development of several libraries leading to a reduction of software implementation and testing efforts without giving up the identity of the separate libraries. A first development along the lines of the mutual compatibility concept is the recently developed model reduction library RASP-MODRED.< >

关键词： Software libraries MATLAB Data structures Software testing Mathematics Size control Lighting control control design Design engineering Robot kinematics

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Packet-switched cellular communication architecture for IVHS using a single radio channel

Packet-switched cellular communication architecture for IVHS...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： J.-P.M.G. Linnartz Telecommunication&Traffic Control Systems Delft University슠of슠Technology Delft Netherlands Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

This paper proposes a radio architecture that offers two-way transmission services essential to intelligent vehicle highway systems (IVHS) using only a single (30 kHz) radio channel. Within this bandwidth multiple communication services can be supported, including datacasting, packet switched transmission to and from vehicles, collection of traffic data from probe vehicles and transmission of emergency messages. The design is based on theoretical investigations reported at PIMRC '93 and VTC '94 on packet-switched downlink transmissions and ALOHA random access for traffic reports from probe vehicles, respectively. These analyses revealed that contiguous frequency reuse gives optimum packet delay and highest spectrum efficiency. New results are included for datacasting messages to groups of vehicles.

关键词： Data communication Broadcasting Probes Intelligent vehicles Road transportation Bandwidth Packet switching Communication switching Downlink Frequency

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Parallel execution of nested loops in band parallelism

Parallel execution of nested loops in band parallelism

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Zen Chen Chih-Chi Chang Chungyong Tsai Institute of Computer Science and Information Engineering National Chiao Tung University Hsinchu Taiwan Department of Electrical Engineering Chung Chu Engineering Institute of Technology Taoyuan Taiwan Department of Control Engineering National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)0818665556

How to execute a nested loop in band parallelism on a multiprocessor system is addressed. The mathematical models of the waveband method, the hyperplane method, the modified hyperplane method and the linear band method are derived and compared. Since the structures of the real multiprocessor systems are at most 3-dimensional, in order to map the loop into these systems, an efficient algorithm for finding the optimal linear band in 2-dimensional index space, instead of a high dimensional index space, is proposed.

关键词： Mathematical model Parallel processing Multiprocessing systems Concurrent computing Systolic arrays Testing Vectors computer science control engineering Pipeline processing

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Bootstrapped decorrelating algorithm for adaptive interference cancelation in synchronous CDMA communications systems

Bootstrapped decorrelating algorithm for adaptive interferen...

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IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： Y. Bar-Ness Z. Siveski D.W. Chen Faculty of Electrical Engineering Telecommunications and Traffic-Control Systems Group Delft University of Technnology Delft Netherlands Center for Communications and Signal Processing Electrical and Computer Engineering Department New Jersey Institute of Technology Newark NJ USA

A code division multiple access detector that employs a combination of a correlation detector and a multiuser adaptive interference canceler was previously proposed by the authors. The weights of the canceler are adaptively controlled by the steepest descent algorithm using the minimum power criterion of the canceler outputs. It was shown that such a canceler substantially outperforms the decorrelating detector and has almost the same error probability as a canceler that uses reliable estimates of the received signal energies. In this paper, a different weight control criterion based on minimizing the correlation between the signals at the outputs of the canceler is used, and its performance is compared to that obtained with the minimum power criterion. It is shown that both cancelers have almost the same performance, particularly when SNR is modestly high. Although it is not shown in this paper, we believe that minimizing correlation rather than power outputs is a more suitable criterion when dealing with highly dispersive channels.< >

关键词： Decorrelation Interference cancellation Code division multiplexing Multiaccess communication Detectors Signal processing algorithms Filters Impedance matching Communication system traffic Telecommunication traffic

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Compliance control of an EMG-controlled prosthetic forearm using ultrasonic motors

Compliance control of an EMG-controlled prosthetic forearm u...

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Proceedings of IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS'94)

作者： K. Ito M. Pecson Zhi-Wei Luo M. Yamakita A. Kato T. Aoya M. Ito Bio-Mimetic Control Research Center RIKEN Institute of Physical and Chemical Research Nagoya Japan Department of lnformation and Computer Sciences Toyohashi University of Technology Toyohashi Japan Department of Electronics Engineering Aichi Institute of Technology Toyota Saitama Japan Department of Electrical Engineering Chubu University Matsumoto Japan

This paper discusses the compliance control of an ultrasonic motor powered prosthetic forearm which utilizes cutaneously measured electromyogram (EMG) signals sensed with the electrodes over the muscles as means of detecting motor commands sent by the central nervous system (CNS). Compliance control of the artificial limb was studied by implementing the bilinear model of the forearm and hand. This model emphasizes the role of the visco-elastic properties of the musculo-skeletal system of the actual limb in controlling its net configuration and movement. The flexor and extensor muscles extending over a joint influence the total joint impedance and determine the equilibrium position of the joint. Relaxing both flexor and extensor muscles makes the joint compliant to external forces, while activating both muscles increases the impedance of the joint.< >

关键词： Prosthetics Muscles Power system modeling Impedance Centralized control control systems Ultrasonic variables measurement Electromyography Electrodes Central nervous system

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