检索结果-内蒙古大学图书馆

Fast blind equalization using complex-valued MLP

NEURAL PROCESSING LETTERS 2005年第3期21卷 215-225页

作者： Pandey, R Natl Inst Technol Dept Elect & Commun Engn Kurukshetra Haryana India

The blind equalizers based on complex valued feedforward neural networks, for linear and nonlinear communication channels, yield better performance as compared to linear equalizers. The learning algorithms are, generally, based on stochastic gradient descent, as they are simple to implement. However, these algorithms show a slow convergence rate. In the blind equalization problem, the unavailability of the desired output signal and the presence of nonlinear activation functions make the application of recursive least squares algorithm difficult. In this letter, a new scheme using recursive least squares algorithm is proposed for blind equalization. The learning of weights of the output layer is obtained by using a modified version of constant modulus algorithm cost function. For the learning of weights of hidden layer neuron space adaptation approach is used. The proposed scheme results in faster convergence of the equalizer.

关键词： blind equalization complex-valued feedforward neural network constant modulus algorithm recursive least square algorithm stochastic gradient descent algorithm

来源：评论

学校读者我要写书评

暂无评论

Multilayered perceptron (MLP) network trained by recursive least squares algorithm

Multilayered perceptron (MLP) network trained by recursive l...

引用

2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005

作者： Ramli, Dzati Athiar Saleh, Junita Mohamad Hashim, Fakroul Ridzuan Isa, Nor Ashidi Mat School of Electrical and Electronic Engineering Universiti Sains Malaysia Engineering Campus 14300 Nibong Tebal Seberang Perai Selatan Pulau Pinang Malaysia

ISBN: (纸本)1424400112

In my research, the performance of multilayered perceptron (MLP) network which trained by recursive least square (RLS) algorithm is investigated. The network has been implemented to classify the cervical cells into normal, low-grade squamos intraepithelial lesion(LSIL) and high-grade squamos intraepithelial lesion(HSIL). Based on Bathesda System, it has achieved to classify the cervical cells with high accuracy, sensitivity and specificity as well as lower false negative and false positive but more work should be done to enhance the system accuracy. © 2005 IEEE.

关键词： Cervical cancer diagnosis system MLP network recursive least square algorithm

来源：评论

学校读者我要写书评

暂无评论

Analysis of different predistortion structures and efficient least square adaptive algorithms

Analysis of different predistortion structures and efficient...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Qian, YQ Li, Q Yao, TR Huazhong Univ Sci & Technol Dept Elect & Informat Wuhan 430074 Peoples R China

ISBN: (纸本)0780376633

Adaptive predistortion is one of the most promising techniques to overcome the nonlinear of High Power Amplifier (HPA). However, the adaptation of predistorter is not satisfied, for many efficient least-square (LS) adaptive algorithm cannot be used. In this paper, we analyze previously published predistortion structures and their difficulties in adapting with these efficient algorithms. The proposed structure constructs the desired output of the predistorter, so many efficient LS adaptive algorithms can be used directly, which implies that we can obtain faster convergence and lower complexity in adaptive process. Simulation results using recursive least square (RLS) algorithm in adaptation demonstrate about 30dB spectrum spreading improvement.

关键词： spread spectrum communication adaptive signal processing power amplifiers radiofrequency amplifiers least squares approximations distortion convergence of numerical methods predistortion structures efficient least-square adaptive algorithms adaptive predistortion nonlinear high power amplifier LS adaptive algorithms convergence complexity simulation results recursive least square algorithm RLS algorithm spread spectrum spreading communication

来源：评论

学校读者我要写书评

暂无评论

A nonlinear recursive least squares algorithm for crosstalk-resistant noise canceler

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 2003年第5期86卷 36-44页

作者： Umayahara, M Iiguni, Y Maeda, H Osaka Univ Dept Commun Engn Suita Osaka 5650871 Japan

In this paper, a method of updating filter coefficients is proposed in which the RLS (recursive least squares) algorithm is applied to a noise canceler with a filter for crosstalk removal. The RLS algorithm has an advantage over the least Mean square algorithm by virtue of better convergence. When the filter coefficients are updated including the filter for crosstalk removal, the error signal becomes nonlinear in terms of filter coefficients. Hence, a nonlinear RLS algorithm is derived in which such non-linearity is taken into account. It is shown that the convergence is further improved in comparison with the conventional RLS algorithm. Finally, a method is proposed to reduce the noise contained in the transmitted voice signals of telephone-by means of the present noise canceler and its effectiveness is evaluated. (C) 2003 Wiley Periodicals, Inc.

关键词： crosstalk noise canceler recursive least square algorithm convergence

来源：评论

学校读者我要写书评

暂无评论

A battery ageing model used in stand alone PV systems

引用

JOURNAL OF POWER SOURCES 2002年第1期112卷 49-53页

作者： Cherif, A Jraidi, M Dhouib, A ENIT Lab Energet Tunis 1002 Tunisia

The authors present a new model for the ageing of a lead-acid battery which is based on the initial model of Shepherd. The proposed model allows to predict temporal variations of the Shepherd coefficients and to control the deterioration of the battery parameters and performances. The model validation has been realised by the recursive least square (RLS) algorithm by using long-term measurements under several solicitations. This study will improve the storage section of stand-alone photovoltaic systems and reduce overloads and deep discharges. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： shepherd model recursive least square algorithm less battery storage system

来源：评论

学校读者我要写书评

暂无评论

RBF neural network with optimal selection cluster algorithm and its application

RBF neural network with optimal selection cluster algorithm ...

引用

4th World Congress on Intelligent Control and Automation

作者： Liu, TN Guan, XZ Liu, ZY Xie, AH Zhang, H Daqing Petr Inst Dept Automat & Control Engn Anda 151400 Heilongjiang Peoples R China

ISBN: (纸本)0780372689

In this paper, it is framed a model of RBF neural network (RBFNN) to solve identification of nonlinear systems. First, it is proposed a kind of optimal selection cluster algorithm. By this algorithm, it is optimally gained the hidden layer node number of RBFNN in terms of input samples. At the same time, it is obtained the initial parameters values of RBF. Then, it is estimated the parameters value of RBF by gradient algorithm with momentum terms, and identified the weights of RBFNN by recursive least square algorithm. With the above two algorithms, it is alternately iterated. By the above hybrid algorithms, it is not only raised identification precision of RBFNN, but also improved generalization property of the net. It is proved the validity of the scheme by its applications.

关键词： RBF neural network optimal selection cluster algorithm identification gradient algorithm recursive least square algorithm

来源：评论

学校读者我要写书评

暂无评论

Application of antenna arrays to mobile communications .2. Beam-forming and direction-of-arrival considerations

引用

PROCEEDINGS OF THE IEEE 1997年第8期85卷 1195-1245页

作者： Godara, LC School of Electrical Engineering Australian Defence Force Academy University of New South Wales Canberra ACT Australia

Array processing involves manipulation of signals induced on various antenna elements. Its capabilities of steering nulls to reduce cochannel interferences and pointing independent beams toward various mobiles, as well as its ability to provide estimates of directions of radiating sources, make it attractive to a mobile communications system designer. Array processing is expected to play an important role in fulfilling the increased demands of various mobile communications services. Part I of this paper showed how an array could be utilized in different configurations to improve the performance of mobile communications systems, with references to various studies where feasibility of an array system for mobile communications is considered. This paper provides a comprehensive and detailed treatment of different beam-forming schemes, adaptive algorithms tl? adjust the required weighting on antennas, direction-of-arrival estimation methods-including their performance comparison-and effects of errors on the performance of an array system, as well as schemes to alleviate them. This paper brings together almost all aspects of array signal processing. It is presented at a level appropriate to nonexperts in the field and contains a large reference list to probe further.

关键词： beam forming conjugate gradient method eigenstructure methods ESPRIT least square algorithm linear prediction method maximum entropy maximum likelihood method minimum norm mobile communications multipath arrivals MU-SIC MVDR estimator neural networks recursive least square algorithm weighted subspace fitting

来源：评论

学校读者我要写书评

暂无评论

Design of demodulator for the chaotic modulation communication system

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS 1997年第3期44卷 262-267页

作者： Leung, H Lam, J UNIV OTTAWA DEPT PHYSOTTAWAON K1N 6N5CANADA

Chaotic modulation has recently been proposed for spread spectrum (SS) and code division multiple access (CDMA) communication. It embeds the signal of transmission in the bifurcating parameter of a chaotic dynamical system, and uses the wide-band output of the chaotic system as the transmitted signal. In this brief, me consider the demodulation of this communication scheme using an adaptive filter. Not only can an adaptive filter reduce the effect of channel noise, but it also estimates the bifurcating parameter (i.e., the signal of transmission) sequentially which is required in a communication system, Three kinds of adaptive filters: the least mean square (LMS) algorithm, the recursive least square (RLS) technique and the Kalman filter, are considered here. It is found that the demodulators based on these adaptive filters outperform the standard inversion approach used in the literature.

关键词： adaptive filters chaotic modulation extended Kalman filter least mean square algorithm recursive least square algorithm

来源：评论

学校读者我要写书评

暂无评论

Nonlinear signal processing based upon a reconfigurable knowledge database

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 1995年第8期78卷 22-30页

作者： Iiguni, Y Member Faculty of Engineering Kyoto University Kyoto Japan 606

One of the most important problems in signal processing is to estimate the output for a known input, here referred to as a query from the input/output (I/O) data seen to this point. A nonlinear adaptive estimation method that uses a k-d trie (k-dimensional binary digital search tree) as an alternative to the k-d tree is presented here. The observed data are stored in the k-d trie, and a local model to answer each query is built by using the n nearest neighbors of the query. The database contents are updated as each new data point is available such that the latest N data are contained. This enables nonlinear adaptive signal processing in nonstationary environments. A storage procedure for the k-d trie that allows efficient update is presented for further reduction in computation time and storage requirement, A recursive least square algorithm, used for a recursive production of the local model, improves computational efficiency, Finally, a method of removing outliers is presented for improving estimation accuracy.

关键词： nonlinear estimation k-d trie adaptive signal processing recursive least square algorithm local model residual analysis

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：