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检索条件"主题词=iterative algorithm"

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Defuzzified clustering algorithms derived from the method of entropy-based fuzzy c-means

Defuzzified clustering algorithms derived from the method of...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Miyamoto, S Yasukochi, T Inokuchi, R Univ Tsukuba Dept Risk Engn Tsukuba Ibaraki 3058573 Japan

ISBN: (纸本)0780392981

A class of hard c-means algorithms is derived from 'defuzzifying' objective functions of the entropy-based fuzzy c-means and the KL-information based fuzzy c-means. Namely an entropy term is deleted from the objective functions while other parameters of cluster sizes and covariances are preserved. As a result the objective function becomes linear with respect to the membership whereby a hard c-means algorithm is derived. Variations of the basic hard c-means algorithms are moreover proposed and reduction of computation using iterative matrix inversion is considered. Numerical examples are shown to compare results of proposed algorithms. Finally a cluster validity measure is used whereby stability of clusters by different algorithms is compared.

关键词： fuzzy c-means hard c-means cluster size covariance iterative algorithm

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A Novel DOA algorithm for CDMA System

A Novel DOA Algorithm for CDMA System

引用

International Conference on Networks Security, Wireless Communications and Trusted Computing

作者： Peng, Zhenzhe Wan, Fangjie Natl Digital Switching Ctr Zhengzhou Peoples R China

ISBN: (纸本)9780769536101

In this paper, an iterative high-resolution DOA algorithm is proposed for DOA estimation for CDMA systems. The algorithm iteratively removes detected signals from the received data and searches the residue spatial spectrum for further signals. It does not require any computationally expensive eigen decomposition or spatial smoothing in coherent multipath scenarios. Results are presented illustrating high-resolution at significantly lower SNR levels than those obtained by classical DOA algorithms such as MUSIC and MVM.

关键词： DOA CDMA iterative algorithm MUSIC MVM

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A Carrier Frequency Offset Estimation for Burst Transmission Based on EM algorithm 7

A Carrier Frequency Offset Estimation for Burst Transmission...

引用

7th IEEE International Conference on Communication and Signal Processing (IEEE ICCSP)

作者： Wang, Silei Li, Yubai Wang, Jian Univ Elect Sci & Technol China Sch Commun & Informat Engn Chengdu Sichuan Peoples R China

ISBN: (纸本)9781538635216

In this paper, the problem of carrier frequency offset estimation for burst-mode transmission on the AWGN channel in GMSK system and OFDM system is exploited within the framework of the expectation-maximization (EM) algorithm. A joint pilot symbols and unknown data symbol CFO estimation algorithm based on EM is introduced. By exploiting the posterior information of the unknown data symbols which are referred to latent variable in EM algorithm and known pilot symbols jointly, the accuracy of the estimation can be improved effectively without degrading the spectral efficiency. Simulation results show that the proposed algorithm has a better performance than that of the conventional Data-Aided algorithm and the accuracy can achieve the Cramer-Rao Bound (CRB) at moderately high signal-to-noise ratios (SNR).

关键词： Burst transmission carrier frequency offset frequency estimation iterative algorithm

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MULTI-STREAM iterative SVD FOR MASSIVE MIMO COMMUNICATION SYSTEMS UNDER TIME VARYING CHANNELS

MULTI-STREAM ITERATIVE SVD FOR MASSIVE MIMO COMMUNICATION SY...

引用

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

作者： Chen, Junting Lau, Vincent K. N. Hong Kong Univ Sci & Technol Dept Elect & Comp Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781479928934

Singular value decomposition (SVD) plays an important role in signal processing for multi-input multi-output (MIMO) communication systems. Under massive MIMO scenarios, as the channel matrix is very large, implementing SVD at every frame is highly inefficient. Existing literature on iterative SVD algorithms are mostly heuristic based, and the associated tracking performance under time-varying channels is not clear. The difficulties of deriving and analyzing SVD algorithms are due to the non-convexity of the associated optimization problem and the time-varying nature of the MIMO channel. In this paper, we formulate the problem on Grassmann manifolds and derive a multi-stream iterative SVD algorithm using optimization techniques. To enhance the tracking performance under timevarying channels, we propose a compensation algorithm to offset the motion of the time-varying target eigenspace. We analyze the convergence behavior of the proposed algorithm, where we show that under some mild conditions, the proposed iterative SVD algorithm with compensations has zero tracking error, despite the underlying problem being non-convex and the channel being time-varying. The complexity of the algorithm is only O(n(2)p) for estimating p singular vectors, compared with O(n(3)) for the SVD of a n x n channel matrix.

关键词： SVD iterative algorithm Convergence analysis Grassmann manifold Optimization

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Source Localization using TDOA and FDOA Measurements with Sensor Information Uncertainties 40

Source Localization using TDOA and FDOA Measurements with Se...

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40th Chinese Control Conference (CCC)

作者： Qu, Xiaomei Liu, Tao Southwest Minzu Univ Key Lab Comp Syst State Ethn Affairs Commiss Chengdu 610041 Sichuan Peoples R China

ISBN: (纸本)9789881563804

This paper explores the source localization problem using the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements when sensor location information suffers from random uncertainties. The analysis of the Cramer-Rao lower bound (CRLB) illustrates that the sensor uncertainties can considerably deteriorate the localization accuracy, so we fully incorporate the sensor location information uncertainties into the problem formulation. An iterative source localization algorithm is proposed to recursively solve the formulated problem, where the sensor information uncertainties is incorporated in each iteration to improve the localization performance.

关键词： Source localization Sensor information uncertainties Cramer-Rao lower bound iterative algorithm

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Color image sharpening based on collective time-evolution of simultaneous nonlinear reaction-diffusion

Color image sharpening based on collective time-evolution of...

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Conference on Visual Communications and Image Processing 2003

作者： Saito, T Satsumabayashi, J Harada, H Komatsu, T Kanagawa Univ Dept Elect Elect & Informat Engn Kanagawa Ku Yokohama Kanagawa 2218686 Japan

ISBN: (纸本)0819450235

Previously we have presented a method for selective sharpness enhancement of monochrome images. Our method is based on the simultaneous nonlinear reaction-diffusion time-evolution equipped with a nonlinear diffusion term, a reaction term and an overshooting term, and it can sharpen only degraded edges blurred by several causes without increasing the visibility of nuisance factors such as random noise. This paper extends our method to selective sharpening of color images. As to the how to extend it, we take into accounts some variations about the treatment of three color components and the selection of the color space. By experiments, we quantitatively evaluate performance of these variations. Among them, the collective treatment of color components based on the simultaneous full-nonlinear reaction-diffusion time-evolution achieves the best performance, and sharpens blurred color edges selectively much better than the existing sharpness enhancement methods such as the adaptive peaking method.

关键词： nonlinear partial differential equation nonlinear algorithm iterative algorithm Riemannian metric image enhancement de-blurring color image processing

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iterative method for designing an observer-based mixed H₂/D-stability controller

Iterative method for designing an observer-based mixed <i>H<...

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SICE-ICASE International Joint Conference

作者： Kami, Yasushi Nobuyama, Eitaku Department of Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Innovation and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9788995003848

This paper treats the output feedback H-2 control with regional pole placement condition. In general, this problem is a BMI problem which is difficult to be solved theoretically. The purpose of this paper is to propose an iterative method for obtaining a sub-optimal solution of the H-2 control problem with regional pole placement condition. The key idea of this paper is to employ a full-order observer-based controller. The proposed method produces a sequence of controllers which approaches to the unconstrained globally optimal H-2 controller while it satisfies the D-stability constraint. A numerical example shows the effectiveness of our method.

关键词： mixed H-2/D-stability control observer-based controller iterative algorithm separation principle

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Investigation of an iterative Method for Finding of Currents, Voltages and Termination Impedances of PCB Traces Based on Phase-less Near-field Data

Investigation of an Iterative Method for Finding of Currents...

引用

IEEE International Joint Symposium on Electromagnetic Compatibility (EMC), Signal and Power Integrity (SIPI) and EMC Europe

作者： Nowak, Robert Frei, Stephan TU Dortmund Univ On Board Syst Lab Dortmund Germany

ISBN: (纸本)9781665448888

The evaluation of near-field data can be an effective way to analyze EMI sources. In contrast to antenna measurements, near-field techniques can determine the emitted field without special requirements on the measurement environment. Moreover, critical sources can be found when current distributions can be identified. Therefore, current reconstruction methods for PCB traces were developed. With additional voltage information the termination impedances of the traces can be found. The known phase-less approaches suffers from different limitations, e.g., non-unique reconstruction results. In this paper, the necessary conditions for a unique reconstruction are discussed by investigating simulated phase-less near-field data. Based on these findings, measured near-field data of a PCB trace is evaluated, and the successful retrieval of the phase information is shown. Additionally, reconstructed voltage distributions are presented and compared to measurement data.

关键词： EMI near-field source reconstruction iterative algorithm phase retrieval current reconstruction method

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Strategy of flanged radiators design

Strategy of flanged radiators design

引用

International Conference on Modern Problems of Radio Engineering, Telecommunication and Computer Science

作者： Gaponenko, Nikolay Ogrenich, Eugeny Zaporozhye Natl Tech Univ UA-69063 Zaporozhe Ukraine

The thermal regime of the flanged radiator Is analyzed at change of his thickness. It is shown, that at the certain thickness of a plate the minimal value of weight or weight clearance parameters of a radiator is prov... 详细信息

ISBN: (纸本)9781424413218

关键词： the thermal regime the flanged radiator construction optimization iterative algorithm comparison of materials

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Robustness of the Young/Daly formula for stochastic iterative applications 20

Robustness of the Young/Daly formula for stochastic iterativ...

引用

49th International Conference on Parallel Processing (ICPP)

作者： Du, Yishu Marchal, Loris Pallez (Aupy), Guillaume Robert, Yves Tongji Univ Shanghai Peoples R China ENS Lyon LIP Lyon France Univ Bordeaux INRIA Talence France Univ Tenn Knoxville Knoxville TN USA

ISBN: (纸本)9781450388160

The Young/Daly formula for periodic checkpointing is known to hold for a divisible load application where one can checkpoint at any time-step. In an nutshell, the optimal period is P-YD = root 2 mu C-f where mu(f) is the Mean Time Between Failures (MTBF) and C is the checkpoint time. This paper assesses the accuracy of the formula for applications decomposed into computational iterations where: (i) the duration of an iteration is stochastic, i.e., obeys a probability distribution law D of mean mu(D);and (ii) one can checkpoint only at the end of an iteration. We first consider static strategies where checkpoints are taken after a given number of iterations k and provide a closed-form, asymptotically optimal, formula for k, valid for any distribution D. We then show that using the Young/Daly formula to compute k (as k . mu(D) = P-YD) is a first order approximation of this formula. We also consider dynamic strategies where one decides to checkpoint at the end of an iteration only if the total amount of work since the last checkpoint exceeds a threshold W-th, and otherwise proceed to the next iteration. Similarly, we provide a closed-form formula for this threshold and show that P-YD is a first-order approximation of W-th. Finally, we provide an extensive set of simulations where D is either Uniform, Gamma or truncated Normal, which shows the global accuracy of the Young/Daly formula, even when the distribution D had a large standard deviation (and when one cannot use a first-order approximation). Hence we establish that the relevance of the formula goes well beyond its original framework.

关键词： fault-tolerance checkpoint Young/Daly formula iterative algorithm

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