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Analysis of Norms in Adaptive algorithm on Application of System Identification 3rd

Analysis of Norms in Adaptive Algorithm on Application of Sy...

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3rd International Conference on Information System Design and Intelligent Applications (INDIA)

作者： Panda, Sarthak Mohanty, Mihir Narayan SOA Univ ITER Bhubaneswar Odisha India

ISBN: (纸本)9788132227557;9788132227533

System identification is an important area in signal processing research. It aims to retrieve the system's unknown specifications from its output only. This technology has a wide variety of applications in engineering and control, industries, as well as medical fields. Typically, the identification of models expressed as mathematical equations. Linear, Non-Linear, Non parametric and Hybrid models are few deciding factors on which different techniques for System Identification relies on. In this paper, we discuss in detail the lms algorithm and Nlms algorithm. In particular, various types of norms are included in lms algorithm and the Nlms algorithm is modified according to the norms. Considering different norms in lms algorithm we have analyzed the application of System identification. Also, it has been verified for both linear and non-linear models. Finally, for non-linear system identification based on Wilcoxon norm has been proposed. The results as well as the comparison show that the Wilcoxon norm is one of the better norms than others and is applied for System identification. The results show its efficacy.

关键词： System identification lms algorithm Nlms Norms Wilcoxon norm

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Hybrid 3P4W DSTATCOM for Three Phase Four Wire Distribution System 1

Hybrid 3P4W DSTATCOM for Three Phase Four Wire Distribution ...

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1st IEEE International Conference on Power Electronics, Intelligent Control, and Energy Systems (ICPEICES)

作者： Suresh, Dhanavath Rao, Dharavath Mohan Sukumar, G. Durga Vignan Inst Technol & Sci Deshmukhi Hyderabad Andhra Prades India

ISBN: (纸本)9781467385879

For the improvement power quality in the three phase four wire distribution system;a star-delta transformer based dynamic static compensator (DSTATCOM) has been proposed. The proposed hybrid three phase four DSTATCOM (3P4W DSTATCOM) is comprising of AC power capacitor;three phase three wire dynamic static compensator (3P3W DSTATCOM);a star delta transformer and a single phase neutral line compensator. A control scheme based on least mean square algorithm is used for reference current estimation. The star delta transformer and single phase neutral line compensator are used to mitigate the neutral current. This hybrid approach reduces the rating of the semi-conductor switches of 3P4W DSTATCOM and improves the performance under different utility voltage conditions. To study performance of the proposed system extensive MATLAB/Simulink computer simulation is carried out.

关键词： Active Power Filter Power Quality lms algorithm Star-delta Transformer

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On PN code Acquisition in Direct Sequence Code Division Multiple Access

On PN code Acquisition in Direct Sequence Code Division Mult...

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3rd International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2007)

作者： Asoodeh, S. Maddahi, H. Shahid Beheshti Univ Elect & Comp Engn Tehran Iran KN Toosi Tech Univ Elect & Comp Engn Tehran Iran

ISBN: (纸本)9781424413119

Capacity of a DS/CDMA system is specified according to the performance of the acquisition system. For example, the performance can be defined as the accessibility to a specified amount in acquisition. This paper presents a new scheme of PN code acquisition which has used a FIR adaptive filter and definitely performs better than earlier designs of the matched filter. It has been shown that this design can have similar capacity to what is obtained from bit error rate criteria.

关键词： Direct sequence spread spectrum code acquisition adaptive filter lms algorithm ambiguity area

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Novel Adaptive B-Spline Filter for Hybrid Echo Cancellation

Novel Adaptive B-Spline Filter for Hybrid Echo Cancellation

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IEEE Region 10 Colloquium/3rd International Conference on Industrial and Information Systems

作者： Dash, Ratnakar Panda, Rutuparna Acharya, Bibhudendra Majhi, Banshidhar NIT Rourkela Dept Comp Sci & Engn Rourkela India OIT Dept Elect & Telecommun Engn Burla India NIT Rourkela Dept Elect & Telecommun Engn Rourkela India

ISBN: (纸本)9781424428052

In this paper direct design of Generalized B-spline filters has been presented. It has been shown how to choose filter parameters to meet the desired specifications. These filters exhibit maximally flat magnitude response and low side lobe energy as compared to Kaiser Window filter. Also a new type of adaptive B-spline filter has been developed in this paper. The application of the proposed filters for hybrid echo cancellation on digital cellular has been extensively studied. Results reveal the suitability of the proposed filters for such applications. This filter minimizes the mean square error using proportionate adaptive lms algorithm. The proposed adaptive filter makes a perfect estimate of the hybrid echo.

关键词： Adaptive B-spline filter Hybrid Echo Kaiser Window lms algorithm

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Adaptive algorithms for Enhancement of Speech Subject to a High-Level Noise

Adaptive Algorithms for Enhancement of Speech Subject to a H...

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15th International Conference on Noise Control

作者： Latos, Mariusz Pawelczyk, Marek Silesian Tech Univ Inst Automat Control PL-44100 Gliwice Poland

There are many industrial environments which are exposed to a high-level noise, sometimes much higher than the level of speech. Verbal communication is then practically unfeasible. In order to increase the speech intelligibility, appropriate speech enhancement algorithms can be used. It is impossible to filter off the noise completely from the acquired signal by using a conventional filter, because of two reasons. First, the speech and the noise frequency contents are overlapping. Second, the noise properties are subject to change. The adaptive realisation of the Wiener-based approach can be, however, applied. Two structures are possible. One is the line enhancer, where the predictive realisation of the Wiener approach is used. The benefit of using this structure it that it does not require additional apparatus. The second structure takes advantage of the high level of noise. Under such condition, placing another microphone, even close to the primary one, can provide a reference signal well correlated with the noise disturbing the speech and lacking the information about the speech. Then, the classical Wiener filter can be used, to produce an estimate of the noise based on the reference signal. That noise estimate can be then subtracted from the disturbed speech. Both algorithms are verified, based on the data obtained from the real industrial environment. For laboratory experiments the GRAS. artificial head and two microphones, one at back side of an earplug and another at the mouth are used.

关键词： speech enhancement adaptive system line enhancer lms algorithm high-level noise nonstationary noise earplug active noise control

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Adaptive Inverse Control of Two-axis Hydraulic Shaking Table Based on RLS Filter

Adaptive Inverse Control of Two-axis Hydraulic Shaking Table...

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第三十二届中国控制会议

作者： YANG Ningning GUAN Guangfeng WANG Haitao XIONG Wei Department of Mechanical Engineering Dalian Maritime University

ISBN: (纸本)9781479900305

An adaptive inverse controller in the out loop,which are applied as an outer control loop around the inner control loop of the two-axis angle shaking table,are presented to provide increased control accuracy,stability and reproducibility in applications where inner-control-loop methods prove to be *** kinds of adaptive algorithms lms(Least-mean-square) and RLS (recursive-least-square) are *** results show that the RLS algorithm,which is finally adopted in control system, exhibits fast convergence compared with *** results obtained in acceleration tracking experiment show the effectiveness of the adaptive inverse controller based on RLS algorithm.

关键词： Electro-hydraulic shaking table adaptive filters RLS algorithm lms algorithm adaptive inverse control

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Improved variable step-size least mean square algorithm based on Sigmoid function 8

Improved variable step-size least mean square algorithm base...

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8th International Conference on Information Technology and Quantitative Management (ITQM) - Developing Global Digital Economy after COVID-19

作者： Yu, Wei Cheng, Qing Guan, Sihai Southwest Minzu Univ Coll Elect & Informat Chengdu 610225 Peoples R China Sichuan Vocat Coll Finance & Econ Chengdu 610101 Peoples R China State Ethn Affairs Commiss Key Lab Elect & Informat Engn Chengdu 610225 Peoples R China

One of the research focuses on the least mean square (lms) algorithm is how to design the variable step-size rule to make the lms algorithm converge ratio and steady-state error. The step-size is relatively large in its early stages;that is, the algorithm at this stage converges quickly;when the algorithm tends to a steady-state, the step-size is relatively small, that is. It is at this stage that the steady-state estimation error is relatively tiny. Therefore, looking at it as a whole, the algorithm can converge quickly with lower steady-state errors. Therefore, this paper designs a new step-size rule based on the Sigmoid function and theoretically analyzes the convergence characteristics and steady-state performance. Experiments and simulation comparisons are carried out under the conditions of comparison. The theoretical analysis combined with experimental simulation verification: even if the linear system has a sudden change, this algorithm still has a faster convergence ratio and tracking speed and can obtain minor steady-state errors and steady-state offsets. (C) 2021 The Authors. Published by Elsevier B.V.

关键词： Channel estimation lms algorithm Sigmoid function steady-state error convergence ratio

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Real-time Identification Method and Experiment of Controlled Channel Model in Adaptive Filtering Vibration Control

Real-time Identification Method and Experiment of Controlled...

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2nd International Symposium on Test Automation and Instrumentation

作者： Shen Jianfen Zhu Xiaojin Zhou Yi Wu Xiaojun Shanghai Univ Sch Mechatron Engn & Automat Shanghai 200072 Peoples R China

ISBN: (纸本)9787506292207

In allusion to the multi-channel adaptive filtering feedforward control demand of structure vibration, this article focuses on the real-time identification method and experimental research of controlled channel in adaptive feedforward control, by taking flexible piezoelectric smart structure as test's model. Minimum square algorithm is used unified in real-time identification and control issues, also the channel model identification methods and the implementation of structural plans are given;A control system, including PC and monitoring template(including vc33dsp), is used in the controlled channel model's real-time identification;In this foundation, active vibration control test of piezoelectric smart structure is carried out, and the good results indicate that the controlled channel model's identification method is correct and feasible.

关键词： Adaptive vibration control Real-time identification Piezoelectric intelligent structure lms algorithm

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Constrained filter-based fundamental frequency tracking in power systems

Constrained filter-based fundamental frequency tracking in p...

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IEEE Region 10 Conference (TENCON 2008)

作者： Arya, Krishna Vijaykumar, C. Dhirubhai Ambani Inst Informat & Commun Technol Gandhinagar India

ISBN: (纸本)9781424424085

In power systems the primary requirement is to find a rigorous approach to suppress the harmonics and ultimately extract the fundamental frequency component. The method presented enables the FIR filter design satisfying specific frequency characteristics with auxiliary constraints. The job of design is converted to an optimization problem with the constraint using standard mean square criterion. The strategy behind detection is to optimize the destined constraint function and to minimize the mean square error. The performance of the advised technique is compared with that of lms and linear optimal filters. Experimental results both in ideal and noisy condition associated with the three methods are given.

关键词： lms algorithm Harmonics Linear optimal filters Constrained filters

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Design and Implementation of A DSP Control System for Giant Magnetostrictive Smart Structures

Design and Implementation of A DSP Control System for Giant ...

引用

IEEE International Conference on Automation and Logistics

作者： Zhang, Wenguang Mao, Jianqin Ma, Yanhua Beijing Univ Aeronaut & Astronaut Res Div 7 Beijing 100083 Peoples R China

ISBN: (纸本)9781424425020

In this paper, a Digital Signal Processing (DSP) control system which is used in the multiple degree-of-freedom (DOF) giant magnetostrictive smart structure (GMSS) is proposed. The control system includes two parts - DSP Card and analog circuit through which DSP Card can get the detection signal and output control signal to giant magnetostrictive actuator (GMA). A adaptive least mean-square (lms) control algorithm is embedded in DSP Card's Flash Memory for controlling GMSS to weaken the micro-vibration outside. Work flow and control approach of the GMSS with the DSP control system are introduced. The experiment results indicate that the DSP control system in this paper has better control precision and real-time property, and the damping effect is up to 20-30 dB.

关键词： DSP control system gaint magnetostrictive active vibration control lms algorithm

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