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High voltage power line constraints for high speed communications

High voltage power line constraints for high speed communica...

引用

Mediterranean Electrotechnical Conference (MELECON)

作者： M. Zajc N. Suljanovic A. Mujcic J. Tasic Laboratory for digital signal image and video processing Faculty of electrical engineering University of Ljubljana Ljubljana Slovenia

Paper presents technical limitations and constraints of high-voltage power-lines for high-speed digital PLC communications. signal reflection and noise characteristics are recognized as major technical limitations for digital PLC system development. Results from a computer model and measurements are presented. Proposed solutions are at the end.

关键词： Voltage Programmable control Power system modeling Bit rate Power system reliability Conductors Power line communications Power system protection Communication channels Costs

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Development of digital image retrieval technique using autocorrelogram and wavelet based texture

Development of digital image retrieval technique using autoc...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： P. Skulsujirapa S. Aramvith S. Siddhichai Digital Signal Processing Research Laboratory Department of Electrical Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand National Electronics and Computer Technology Center Pathumthani Thailand

In this paper, we present the development of a digital image retrieval technique using autocorrelogram and wavelet based texture feature. Autocorrelogram is a color feature that is able to incorporate the spatial correlation of alike color and is tolerant to large changes in appearance, color, contrast, and brightness. A wavelet transform is used to analyze the textures that are characterized by their energy distribution in each sub-band. We propose an integration of the autocorrelogram and wavelet based texture to improve the performance of the image retrieval system. Experimental results suggest that the proposed integration offers much better performance than using the features separately.

关键词： digital images Image retrieval Image databases Histograms Spatial databases Wavelet transforms Feature extraction Indexing Content based retrieval Shape

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Artificial neural network-based face recognition

Artificial neural network-based face recognition

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International Symposium on Communications Control and signal processing (ISCCSP)

作者： A. Reda B. Aoued Evolutionary Engineering and Distributed Information Systems Laboratory EEDIS Computer Science Department University of Sidi-Bel Abbes Algeria Digital Signal processing laboratory Electronic Department University of Sidi-Bel Abbes Algeria

This document demonstrates how a face recognition system can be designed with artificial neural network. Note that the training process did not consist of a single call to a training function. Instead, the network was trained several times on various input ideal and noisy images, the images that contents faces. In this case training a network on different sets of noisy images forced the network to learn how to deal with noise, a common problem in the real world.

关键词： Artificial neural networks Face recognition Neural networks Neurons Face detection Image databases Laboratories Humans Design engineering Distributed information systems

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Comparison of BITCM performance in dPLC channel with AWGN channel

Comparison of BITCM performance in dPLC channel with AWGN ch...

引用

2003 IEEE International Conference on Industrial Technology, ICIT - Proceedings

作者： Mujčić, A. Suljanović, N. Zajc, M. Tasič, J.F. University of Ljubljana Faculty of Electrical Engineering Digital Signal Processing Laboratory Tržaška 25 1000 Ljubljana Slovenia

The performance of bit interleaved turbo coded modulation (BITCM) technique in the power line channel and comparison with AWGN channel is presented. The noise characteristics are given for normal operations of power line network and foul weather condition. The model of power line channel including impulse noise is appropriated for investigation of channel coding methods. The bit error rate (BER) of M-ary quadrature amplitude modulation over PLC channel is given and represents the starting point for coding gain estimation. The BITCM system model is based on QAM maping. The error rate performance obatined by computer simulation gives the basic characteristics of BITCM in communications over power line. © 2003 IEEE.

关键词： Electric power systems

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Power line noise model appropriate for investigation of channel coding methods 2

Power line noise model appropriate for investigation of chan...

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2nd IEEE Region 8 EUROCON 2003

作者： Mujčić, Aljo Suljanović, Nermin Zajc, Matej Tasič, Jurij F. University of Ljubljana Faculty of Electrical Engineering Digital Signal Processing Laboratory Tržaška 25 Ljubljana1000 Slovenia

ISBN: (纸本)078037763X

Paper presents an experimental and theoretical research of power line noise performed on overhead power line. High voltage (HV) power line, as a communication media, is a source by itself of different noises characterizing an important signature of this communication media. Investigation of appropriate channel coding techniques by computer simulations requires transfer characteristics of channel and statistical model of noise. In this paper the computer model of power line noise is presented. A simulation of the noise is carried out in Matlab. ©2003 IEEE.

关键词： Channel coding

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High-frequency characteristics of high-voltage power line 2

High-frequency characteristics of high-voltage power line

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2nd IEEE Region 8 EUROCON 2003

作者： Suljanović, Nermin Mujčić, Aljo Zajc, Matej Tasič, Jurij F. Digital Signal Processing Laboratory Faculty of Electrical Engineering University of Ljubljana Tržaška 25 Ljubljana1000 Slovenia

ISBN: (纸本)078037763X

Paper presents a major high-frequency characteristics of high-voltage overhead power line: amplitude characteristics, group delay and noise characteristics. Since measurements of high-frequency power-line characteristics are rare due to permission of power utilities for access to power lines, computer simulations have a crucial role in design of communication systems via power lints. Simulated highfrequency and noise characteristic of 400 kV power line are presented and compared with measurements on actual power line. © 2003 IEEE.

关键词： Group delay

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High-frequency characteristics of high-voltage power line

High-frequency characteristics of high-voltage power line

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Eurocon

作者： N. Suljanovic A. Mujcic M. Zajc J.F. Tasic Digital Signal Processing Laboratory Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia

This paper presents a major high-frequency characteristic of high-voltage overhead power line: amplitude characteristics, group delay and noise characteristics. Since measurements of high-frequency power-line characteristics are rare due to permission of power utilities for access to power lines, computer simulations have a crucial role in design of communication systems via power lines. Simulated high-frequency and noise characteristics of 400 kV power line are presented and compared with measurements on actual power line.

关键词： Mathematical model Frequency Power system modeling Power measurement Wires Noise level computer simulation Computational modeling Programmable control Delay

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Power line noise model appropriate for investigation if channel coding methods

Power line noise model appropriate for investigation if chan...

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Eurocon

作者： A. Mujcic N. Suljanovic M. Zajc J.F. Tasic Faculty of Electrical Engineering Digital Signal Processing Laboratory University of Ljubljana Ljubljana Slovenia

This paper presents an experimental and theoretical research of power line noise performed on overhead power line. High voltage (HV) power line, as a communication media, is a source by itself of different noises characterizing an important signature of this communication media. Investigation of appropriate channel coding techniques by computer simulations requires transfer characteristics of channel and statistical model of noise. In this paper, the computer model of power line noise is presented. A simulation of the noise is carried out in Matlab.

关键词： Channel coding Mathematical model computer simulation Noise measurement Computational modeling Power system modeling Communication systems Voltage Programmable control Hardware

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Comparison of BITCM performance in dPLC channel with AWGN channel

Comparison of BITCM performance in dPLC channel with AWGN ch...

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IEEE International Conference on Industrial Technology (ICIT)

作者： A. Mujcic N. Suljanovic M. Zajc J.F. Tasic Faculty of Electrical Engineering Digital Signal Processing Laboratory University of Ljubljana Ljubljana Slovenia

The performance of bit interleaved turbo coded modulation (BITCM) technique in the power line channel and comparison with AWGN channel is presented. The noise characteristics are given for normal operations of power line network and foul weather condition. The model of power line channel including impulse noise is appropriated for investigation of channel coding methods. The bit error rate (BER) of M-ary quadrature amplitude modulation over PLC channel is given and represents the starting point for coding gain estimation. The BITCM system model is based on QAM mapping. The error rate performance obtained by computer simulation gives the basic characteristics of BITCM in communications over power line.

关键词： AWGN channels Additive white noise Gaussian noise Power system modeling Bit error rate Quadrature amplitude modulation Turbo codes Modulation coding Channel coding Programmable control

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Comparison of time-frequency analysis performance on hearts and murmurs

Comparison of time-frequency analysis performance on hearts ...

引用

Student Conference on Research and Development (SCOReD)

作者： S. Daliman A.Z. Sha'ameri Digital Signal Processing Laboratory Department of Microelectronics and Computer Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Dept of Microelectronics and Computer Engineering Universiti Teknologi Malaysia Malaysia

Time-frequency analysis is one of the methods to deal with non-stationary and time-varying signal such as heart sounds and murmurs. Wigner-Ville distribution (WVD) is a popular tool to obtain time-frequency representation of signal. Windowed Wigner-Ville distribution (WWVD) and smooth windowed Wigner-Ville distribution (SWWVD) are the improvement method to overcome the problem faced by WVD. Determination of parameter setting of WWVD and SWWVD eliminates the cross-terms and improve time-frequency representation. The accuracy of time-frequency representation of simulated heart sounds and murmurs are compared and determined based on the mainlobe width, peak-to-sidelobe average ratio and signal-to-interference ratio. It is found that the most accurate time-frequency representation can be obtained using the SWWVD.

关键词： Time frequency analysis Heart Kernel signal analysis Frequency estimation digital signal processing Microelectronics Acoustical engineering signal processing Auditory system

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