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International Symposium on Communications and Information Technologies (ISCIT)

作者： T. Phamdinh W. Lee M. Cotonetr S. Jitapunkul Digital Signal Processing Research Laboratory Electrical Engineering Department Faculty of Engineering Chulalongkom University Bangkok Thailand

Orthogonal frequency division multiplexing (OFDM) systems in combination with multiple-input multiple-output (MIMO) transmission are potential candidates for next generation wireless local area networks (WLAN). In this paper, we propose a novel algorithm for bit allocation, called upward bit allocation algorithm (UBAA), to minimize transmit power while maintaining bit error rate (BER) in MIMO-OFDM systems with fixed throughput. Since the optimal discrete bit allocation is of high complexity, UBAA with efficient logarithmic search is proposed as a sub-optimal approach. Performance of UBAA is evaluated by computer simulation and compared to that of optimal algorithm and existing sub-optimal schemes.

关键词： Bit rate MIMO Wireless LAN OFDM modulation Signal processing algorithms Transmitting antennas Receiving antennas Transmitters Bit error rate system performance

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Aspects of traditional versus virtual laboratory for education in instrumentation and measurement

Aspects of traditional versus virtual laboratory for educati...

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IMTC'05 - Proceedings of the IEEE Instrumentation and Measurement Technology Conference

作者： Grimaldi, Domenico Rapuano, Sergio Laopoulos, Theodore Department of Electronics Computer and System Science University of Calabria Rende-CS Italy Engineering Faculty University of Sannio Piazza Roma Benevento Italy Electronics Lab. Physics Department Aristotle University of Thessaloniki Thessaloniki Greece

ISBN: (纸本)0780388798

Nowadays the multimedia tools have an important role in both the management of the lectures and the organization of the course program on instrumentation and measurement. In this new scenario the Virtual laboratory (VL) represents the environment in which the learning activities are performed. Starting from this observation, in the paper an overview of the state of the an of the VL-based education on instrumentation and measurement is given. The fundamental aspects concerning both the software and the hardware to design the VL are examined. Attention it is also devoted to innovative requirements and interesting open questions arising from the large diffusion of the VLs. © 2005 IEEE.

关键词： Distance education

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Application of string kernels in protein sequence classification

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Applied Bioinformatics 2005年第1期4卷 45-52页

作者： Zaki, Nazar M. Deris, Safaai Illias, Rosli College of Information Technology United Arab Emirates University Al Ain United Arab Emirates Artificial Intelligence and Bioinformatics Laboratory Faculty of Computer Science and Information System Universiti Teknologi Skudai Johor Malaysia Department of Bioprocess Engineering Faculty of Chemical and Natural Resource Engineering Universiti Teknologi Skudai Johor Malaysia College of Information Technology United Arab Emirate University Al Ain PO Box 17555 United Arab Emirates

Introduction: The production of biological information has become much greater than its consumption. The key issue now is how to organise and manage the huge amount of novel information to facilitate access to this useful and important biological information. One core problem in classifying biological information is the annotation of new protein sequences with structural and functional features. Method: This article introduces the application of string kernels in classifying protein sequences into homogeneous families. A string kernel approach used in conjunction with support vector machines has been shown to achieve good performance in text categorisation tasks. We evaluated and analysed the performance of this approach, and we present experimental results on three selected families from the SCOP (Structural Classification of Proteins) database. We then compared the overall performance of this method with the existing protein classification methods on benchmark SCOP datasets. Results: According to the F1 performance measure and the rate of false positive (RFP) measure, the string kernel method performs well in classifying protein sequences. The method outperformed all the generative-based methods and is comparable with the SVM-Fisher method. Discussion: Although the string kernel approach makes no use of prior biological knowledge, it still captures sufficient biological information to enable it to outperform some of the state-of-the-art methods. © 2005 Adis Data Information BV. All rights reserved.

关键词： Amino Acid Sequence Creating metadata Support Vector Network protein database Information management ANNOTATIONS Information, biological PHLPP1 gene Cosmic strings Seeds

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A 231MHz, 2.18mW 32-bit Logarithmic Arithmetic Unit for Fixed-Point 3D Graphics system

A 231MHz, 2.18mW 32-bit Logarithmic Arithmetic Unit for Fixe...

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IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Hyejung Kim Byeong-gyu Nam Ju-ho Sohn Hoi-jun Yoo Semiconductor System Laboratory Department of Electrical Engineering and Computer Science KAIST Daejeon South Korea

A 32-bit fixed-point logarithmic arithmetic unit is designed for mobile 3D graphics system. The proposed logarithmic arithmetic unit performs division, reciprocal, square-root, reciprocal-square-root and square operations in 2-cycle, and powering operation in 5-cycle. It uses programmable precision for accurate 3D pipeline computation and 8-region piecewise linear approximation model for logarithmic and exponential conversion to reduce the operation error under 0.2%. Its test chip is implemented by 1-poly 6-metal 0.18mum CMOS technology with 9k gates. It operates at the maximum frequency of 231MHz and consumes 2.18mW

关键词： Fixed-point arithmetic Energy consumption digital arithmetic computer graphics Pipelines CMOS technology Frequency Real time systems Clocks Laboratories

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A Portable Wireless DSP system for a Brain Machine Interface

A Portable Wireless DSP System for a Brain Machine Interface

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International IEEE/EMBS Conference on Neural engineering, CNE

作者： S. Darmanjian S. Morrison B. Dang K. Gugel J. Principe Computational Neuro Engineering Laboratory Applied Digital Design Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Texas Instrumenits Inc. Dallas TX USA Lockheed Martin IS&S San Jose CA USA Applied Digital Design Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Computational Neuro Engineering Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

In this paper, we present a design for a wearable DSP system that is capable of processing various neural-to-motor translation algorithms. The system first acquires the neural data through a high speed data bus in order to train and evaluate our prediction models. Then via a widely used protocol, the low-bandwidth output trajectory is wirelessly transmitted to a simulated robot arm. This system has been built and successfully tested with real data

关键词： digital signal processing Hardware Trajectory Algorithm design and analysis Predictive models Robots Brain computer interfaces computer interfaces Wearable computers Laboratories

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An enhanced distributed channel access deficit round-robin (EDRR) access scheme for IEEE 802.11 wireless networks

An enhanced distributed channel access deficit round-robin (...

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IFIP International Conference on Wireless and Optical Communications Networks (WOCN)

作者： C. Powell H. Alnuweiri P. Nasiopoulos Advanced Networking Group Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada MidNet Digital Multimedia Laboratory Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada

IEEE 802.11 wireless LAN is the most popular and most widely deployed Wi-Fi technology in the world. With the explosion in use of wireless networks comes the demand for them to support the latest technologies. Task group E of the 802.11 standard is working on a standard that adds quality of service enhancements in the 802.11 MAC layer by using traffic flows and prioritizing traffic according to what type of application it belongs to. There are, however, some weaknesses in the design that is currently being proposed by the 802.11 standards committee. In this paper, we propose enhancements to the IEEE 802.11 draft standard in an attempt to provide improved quality of service for all traffic priorities. Through our simulations we are able to show that we can do so without negatively affecting the performance of any of the wireless stations in the network or the traffic flows that they contain. Our results show that the proposed scheme provides an attractive and effective mechanism for enhancing the IEEE 802.11 standard.

关键词： Wireless networks Quality of service Telecommunication traffic Wireless LAN Traffic control Streaming media Communication system security Open systems Explosions computer networks

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Real-time simulation to study the impact of renewable energy in power systems

Real-time simulation to study the impact of renewable energy...

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International Conference on Future Power systems

作者： I.J. van Vliet A.M. van Voorden P.H. Schavemaker G.C. Paap L. van der Sluis Faculty of Electrical Engineering Mathematics & Computer ScienceElectrical Power System Laboratory (EPS) Delft University슠of슠Technology Delft Netherlands

A real-time simulation tool, in our case a real-time digital simulator (RTDS), gives the opportunity to study the impact of renewable energy in power systems on a real-time base, driven by actual solar and wind data. In the first part of this paper, the real-time digital simulator (RTDS) is briefly introduced. The application of this analyzing tool is first demonstrated on a detailed model of a wind energy conversion system (WECS) whereas secondly the application on an autonomous power system is shown. Both applications demonstrate the capabilities of this simulator and the added value for power system analysis

关键词： Power system simulation Real time systems Renewable energy resources Power system modeling Power system analysis computing Induction generators Computational modeling Wind energy Distributed power generation Power generation

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GLOBAL ROBUST H ∞ CONTROL FOR NON-MINIMUM-PHASE UNCERTAIN NONLINEAR systemS WITHOUT STRICT TRIANGULAR STRUCTURE

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IFAC Proceedings Volumes 2005年第1期38卷 425-430页

作者： Shengzhi Zhao Jun Zhao Georgi M. Dimirovski Key Laboratory of Process Industry Automation Ministry of Education Northeastern University Shenyang 110004 P. R. Chain Department of Computer Engineering Faculty of Engineering Dogus University Kadikoy TR-34722 Istanbul Turkey

This paper deals with the robust H ∞ control problem for a class of multi-input non-minimum-phase nonlinear systems with parameter uncertainty. A system of this class is assumed to be in a special interlaced form, which includes a strict triangular form as a special case. By using an extension of backstepping, nonlinear static-state feedback controllers are designed such that the closed-loop system is input-to-state stable with respect to the disturbance input and has the prescribed L 2 -gain from the disturbance input to the controlled output for all admissible parameter uncertainties.

关键词： nonlinear systems H ∞ control L 2 -gain state feedback backstepping

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Analog complex wavelet filters

Analog complex wavelet filters

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： S.A.P. Haddad J.M.H. Karel R.L.M. Peeters R.L. Westra W.A. Serdijn Electronics Research Laboratory Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Delft Netherlands Department of Mathematics University of Maastricht Maastricht Netherlands

This paper presents an analog implementation of the complex wavelet transform using both the complex first order system (CFOS) and the Pade approximation. The complex wavelet filter design is based on the combination of the real and the imaginary state-space descriptions that implement the respective transfer functions. In other words, a complex filter is implemented by an ordinary state-space structure for the real part and an extra C matrix for the imaginary part. Several complex wavelets, such as Gabor, Gaussian and Morlet complex wavelets, are obtained and simulations demonstrate excellent approximations to the ideal wavelets.

关键词： Wavelet transforms Filters Mathematics Transfer functions Signal analysis Laboratories computer science Signal detection Wavelet analysis Information analysis

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Unknown Input Detection Using Receding Horizon Approach

Unknown Input Detection Using Receding Horizon Approach

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IEEE International Symposium on Intelligent Control (ISIC)

作者： B. Kulcsar J. Bokor Department of Transport Automation Faculty of Transportation Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The paper offers the possibility of the design of unknown input detection for dynamic systems under external noise effect. The presented geometric based fundamental problem in residual generation (FPRG) method uses on the one hand the Kalman filtering and on the other hand the moving horizon estimation (MHE) when stochastic noise on the input and on the output, with additive failure directions, are presents. The paper combines the optimal Kalman and MHE method with geometric based unknown input observer strategy. The MHE solution makes to treat constraints during the estimation process possible. A numerical example supports the necessity of constrained unknown input estimation

关键词： Fault detection State estimation Control systems Kalman filters Space technology Additive noise Automation Stability Predictive models Predictive control

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