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proceedings of the IEEE Circuits and Systems symposium on Emerging Technologies

作者： R. Raich Hua Qian G.T. Zhou School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

Many communications components are nonlinear and have a peak power or peak amplitude constraint. Nonlinearity generates distortions and thus an appropriate performance measure is the signal-to-noise-and-distortion ratio (SNDR). In this paper, we are interested in finding the nonlinear mapping that maximizes the SNDR subject to the peak amplitude constraint. The answer is a soft limiter with gain calculated based on the noise power and the probability density function of the input amplitude. We also investigate a bounding relationship between the SNDR and capacity of the nonlinear channel. The results of this paper can be applied for efficient transmission of high peak-to-average power ratio signals such as OFDM or for optimal linearization of nonlinear devices.

关键词： Signal to noise ratio Nonlinear distortion Communication channels Noise level Power system modeling Peak to average power ratio Channel capacity PSNR Power engineering computing Power engineering and energy

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Evolutionary approach to NOE paths assignment in RNA structure elucidation

Evolutionary approach to NOE paths assignment in RNA structu...

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IEEE symposium on Computational Intelligence and Bioinformatics and Computational Biology (CIBCB)

作者： J. Blazewicz M. Szachniuk A. Wojtowicz Bioorganic Chemistry Polish Academy of Sciences Poznan Poland Institute of Computing Science Poznan University of Technology Poznan Poland

Resonance assignment remains one of the hardest stages in RNA tertiary structure elucidation with the use of nuclear magnetic resonance spectroscopy. We propose an evolutionary algorithm being a tool for an automatic design of the procedure. NOE pathway, which determines the assignments, is constructed during an analysis of possible connections between resonances within aromatic/anomeric region of 2D-NOESY spectra. Computational tests demonstrate the performance of the genetic algorithm in comparison with the enumerative procedure applied for the experimental and simulated spectral data for RNA molecules.

关键词： RNA Nuclear magnetic resonance Spectroscopy Proteins Algorithm design and analysis DNA Magnetic analysis Molecular biophysics Raman scattering Chemistry

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Three-dimensional reconstruction of objects buried in layered media

Three-dimensional reconstruction of objects buried in layere...

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Antennas and Propagation Society International symposium

作者： Fenghua Li Q.H. Liu Lin-Ping Song Electrical and Computer Engineering Duke University Durham NC USA

In this work, we focus on the 3D image reconstruction of buried objects in layered media with sources and receivers located in the top layer. The inversion of scattering data collected by such a partial aperture is in principle more difficult than in the case of a full aperture because the non-uniqueness become more severe. Both the Born iterative method (BIM), and the distorted Born iterative method (DBIM) are used as the inversion methods. In this work, the stabilized biconjugate-gradient fast Fourier transform (BCGS-FFT) method is applied for calculating 3D electromagnetic scattering in general planarly layered media.

关键词： Nonhomogeneous media Electromagnetic scattering Image reconstruction Buried object detection Iterative methods Apertures Magnetic field measurement Embedded computing Shape Inverse problems

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Arabic/Persian cursive signature recognition and verification using line segment distribution

Arabic/Persian cursive signature recognition and verificatio...

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International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： A. Chalechale G. Naghdy P. Pramaratne School of Electrical Computer & Telecommunications Engineering University of Wollongong Australia

This work proposes a fast method for line segment extraction based on chain code differentiation. It is applied to cursive signature recognition of Arabic/Persian. The evaluation method is introduced to obtain a quantitative value for the recognition rate. The comparative results show the existing differences among the methods in recognition, building time and searching time criteria. The two methods used for comparison are invariant moments and CBLSE method.

关键词： Image segmentation Histograms Computer vision Telecommunication computing Image analysis Face recognition Image retrieval Application software Shape Feature extraction

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A new wideband closed-form Green's function for a HED over microstrip structure

A new wideband closed-form Green's function for a HED over m...

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Antennas and Propagation Society International symposium

作者： A. Aminian R. Faraji-Dana N. Hojjat University of California Los Angeles USA University of Tehran Iran

A new wideband closed-form Green's function for a HED (horizontal electric dipole) over microstrip geometry is presented. The closed-form is valid over wide range of frequencies, and has the potential application for the time domain analysis of multilayer media by combining it with the MoM. It significantly reduces the computational time, as one only needs to sum few terms instead of repeating the time-consuming Sommerfeld's integrals. It may also be noted that the present method can be easily extended to other kinds of sources and applied to general lossy multilayer media.

关键词： Wideband Green's function methods Microstrip Frequency Circuit analysis Printed circuits Geometry Message-oriented middleware Circuit analysis computing Optimization methods

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Computation of the free distance and low weight distribution of turbo codes with convolutional interleavers

Computation of the free distance and low weight distribution...

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

作者： S. Vafi T. Wysocki University of Wollongong Wollongong Australia

This work presents an algorithm for computation of the free distance parameter of turbo codes with a convolutional interleaver implemented to act as a block interleaver. Based on the properties of the interleaver and the algorithm applied, we can also determine the other low weights of turbo codes and this is useful in determining the performance of the error floor of turbo codes. For different turbo code structures, the relevant parameters have been computed. The error rate simulations confirm the algorithm results.

关键词： Distributed computing Turbo codes Convolutional codes Convolution Australia Error analysis Computational modeling Signal to noise ratio Hamming distance Hardware

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Estimate of Convergence Rate of Neural Networks for Image Restoration

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IFAC proceedings Volumes 2004年第11期37卷 85-90页

作者： Yoshiki Mihara Hideki Sano Graduate School of Science and Engineering Kagoshima University. Computing and Communications Center Kagoshima University.

This paper deals with neural networks of 8-neighbor for image restoration which are used for gray images. Generally, since comparatively long operation time is needed when a neural network is applied to a certain problem, it is important to estimate the convergence rate of the neural network in order to evaluate the operation time. In this paper, the theoretical convergence rate of the neural network for image restoration is derived both for the case where an image consists of not many pixels and for the case where an image consists of many pixels. Furthermore, it is shown that the two convergence rates are appropriate through a numerical experiment.

关键词： Neural networks Image restoration Convergence analysis Numerical analysis Stability analysis

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Verifying protocols by model checking: a case study of the wireless application protocol and the model checker SPIN 04

Verifying protocols by model checking: a case study of the w...

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proceedings of the 2004 conference of the Centre for Advanced Studies on Collaborative research

作者： Yu-Tong He Ryszard Janicki Department of Computing and Software McMaster University Hamilton Ontario Canada L8S 4K1

This paper deals with a formal verification of protocols, where the model checking approach is applied. As a case example, the Wireless Application Protocol (WAP Version 2.0) and the SPIN model checker are used. The paper concentrates on the Transaction Layer, in which some defects have been uncovered and proper corrections have been proposed.

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A layer model for the systematic test of time-triggered automotive communication systems

A layer model for the systematic test of time-triggered auto...

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： E. Armengaud A. Steininger M. Horauer R. Pallierer Embedded Computing Systems Group E182-2 University of Technology Vienna Vienna Austria Technikum Wien University of Applied Science Vienna Austria Dependable Computer Systems DECOMSYS GmbH Vienna Austria

This paper presents a layer model tailored for the test of distributed systems that rely on the time-triggered paradigm, such as the FlexRay protocol that is currently employed in the automotive industry. The presented layer model is applied for the generation of a fault model, aids in the inspection of fault propagation throughout the distributed system under consideration and is used for fault diagnosis of defective electronic control units. To that end, this systematic test and diagnosis approach to provide a solid basis for analyzing and verifying future by-wire systems with respect to their communication properties.

关键词： System testing Automotive engineering Protocols Communication system control Technological innovation Communication industry Computer industry Electrical equipment industry Fault diagnosis Electronic equipment testing

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The simple derivation for the effective permittivities formulae in the finite difference grids

The simple derivation for the effective permittivities formu...

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Antennas and Propagation Society International symposium

作者： Xiu Long Bao Zheng Fan Li Xiao Wei Sun Department of Electronic Engineering Shanghai Jiaotong University China The Institute of Microsystem and information technique Chinese Academy and Sciences China

ISBN: (纸本)0780383028

In recently years, the finite difference time domain method (FDTD) has been the most popular numerical method in electromagnetic fields, such as for microwave circuit, antennas, etc. In order to deal with inhomogeneous dielectric in the interface, the usual method is to plot out the mesh along the interface in two kinds of dielectric (J.G. Maloney, and G.S. Smith, IEEE Microwave Guided Wave Lett., vol. 10, pp. 359-361, 2000), but this limits the size of the unit grid which is much smaller, and increases computation time. In this paper, by using analogy with the circuit concept of series-parallel connection of capacitance, the approximate formulae of effective permittivities for various inhomogeneous unit grids are deduced. Under the condition of numerical stability, these formulae are combined with the FDTD method of arbitrary spatial mesh to calculate frequency of the resonant cavity. This proposed method can save computing time and memory than the conventional FDTD method. These effective permittivities formulae will be applied in other difference methods for electromagnetic problem.

关键词： Permittivity Finite difference methods Time domain analysis Dielectrics Electromagnetic fields Microwave theory and techniques Microwave circuits Microwave antennas Grid computing Capacitance

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