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Registration of unorganized points data under different viewpoints based on improved evolutional algorithm

Registration of unorganized points data under different view...

引用

International Conference on Mechanic Automation and Control Engineering (MACE)

作者： Qiming Wei Weiyong Wu School of Information Science & Technology Jiujiang University Jiujiang China

A integrated matching method with DE and ICP algorithm was proposed to match partly overlapped data clouds measured from different viewpoints. Firstly, data clouds were roughly matched with DE algorithm method and then ICP algorithm method was employed in the accuracy registration. In differential evolution, quaternion method was used to decrease the individual numbers of revolution space, to avoid premature convergence and improve optimizing speed, the probabilities of crossover and mutation were adaptively adjusted by means of adaptive algorithm. Some examples proved the method was effective and efficient for aligning large number of three dimension clouds data.

关键词： Iterative closest point algorithm Clouds Information science Quaternions Convergence Optimization methods Genetic mutations adaptive algorithm Chromium

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A new algorithm to blind separate QAM signals in narrowband MIMO communication systems

A new algorithm to blind separate QAM signals in narrowband ...

引用

International Symposium on Signal Processing and Its Applications (ISSPA)

作者： A. Ikhlef D. Le Guennec J. Palicot IETR/Supelec Cesson-Sevigne France

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Bootstrap: a fast blind adaptive signal separator

Bootstrap: a fast blind adaptive signal separator

引用

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

作者： A. Dinc Y. Bar-Ness Center for Communication and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

A fast multidimensional adaptive algorithm, Bootstrap, is proposed for multiple signal separation. It separates multiple uncorrelated signals imposed on each other. The bootstrap adaptive algorithm, which does not require training sequences, uses an optimization criteria that is based on minimization of output signal correlations. The learning process of this algorithm is compared with that of the least mean square (LMS) algorithm for different eigenvalue spreads. It has been found from computer simulations that the Bootstrap algorithm converges much faster than the LMS algorithm. The learning process of the Bootstrap algorithm is almost independent of eigenvalue spread.< >

关键词： Particle separators Signal processing algorithms Least squares approximation Convergence Interference Multidimensional systems adaptive signal processing Multidimensional signal processing adaptive algorithm Source separation

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An Efficient Implementation of adaptive Prefix Coding

An Efficient Implementation of Adaptive Prefix Coding

引用

Data Compression Conference (DCC)

作者： Yakov Nekrich Department of Computer Science University of Bonn Germany

The goal of the prefix coding is to assign codewords to elements of the input alphabet A, so that no codeword is a prefix of another one, and the total length of the encoded message S is minimized. In the case of static prefix coding, symbol frequencies are known in advance. In the case of adaptive (or dynamic) prefix coding, every symbol S i is encoded before the next symbol S i+1 is read.

关键词： Arithmetic Decoding Frequency Information theory Computer science adaptive algorithm Upper bound Testing Costs adaptive coding

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An adaptive Delay-Minimized Route Design for Wireless Sensor-Actuator Networks

An Adaptive Delay-Minimized Route Design for Wireless Sensor...

引用

IEEE Internatonal Conference on Mobile Adhoc and Sensor Systems (MASS)

作者： Edith C.-H. Ngai Jiangchuan Liu Michael R. Lyu Department of Computer Science & Engineering Chinese University of Hong Kong Hong Kong China School of Computing Science Simon Fraser University Vancouver BC Canada

Wireless sensor-actuator networks (WSANs) have recently been suggested as an enhancement to the conventional sensor networks. The powerful and mobile actuators can patrol along different routes and communicate with the static sensor nodes. This work is motivated by applications in which the objective is to minimize the data collection time in a stochastic and dynamically changing sensing environment. This is a departure from the previous static and deterministic mobile element scheduling problems. In this paper, we propose PROUD, a probabilistic route design algorithm for wireless sensor-actuator networks. PROUD offers delay-minimized routes for actuators and adapts well to network dynamics and sensors with non-uniform weights. This is achieved through a probabilistic visiting scheme along pre-calculated routes. We present a distributed implementation for route calculation in PROUD and extend it to accommodate actuators with variable speeds. We also propose the Multi-Route Improvement and the Task Exchange algorithms for balancing load among actuators. Simulation results demonstrate that our algorithms can effectively reduce the overall data collection time in wireless sensor-actuator networks. It well adapts to network dynamics and evenly distributes the energy consumption of the actuators.

关键词： Wireless sensor networks Actuators Mobile communication Chemical sensors algorithm design and analysis Energy consumption Frequency adaptive algorithm Large-scale systems Stochastic processes

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Two-Pole and Multi-Pole Notch Filters: a Computationally Effective Solution for Interference Detection and Mitigation

Two-Pole and Multi-Pole Notch Filters: a Computationally Eff...

引用

International Conference on ITS Telecommunications (ITST)

作者： Daniele Borio Laura Camoriano Letizia Lo Presti Dipartimento di Elettronica Politecnico di Torino Torino Italy Istituto Superiore Mario Boella Torino Italy

In a Global Navigation Satellite System (GNSS) receiver the presence of detection and mitigation units, capable of reducing the impact of disturbing signals, can extremely enhance the position accuracy. However the presence of such units is usually limited to professional receivers that dispose of additional computational power that can be used for interference detection and mitigation. In this paper the two-pole notch filter, the natural extension of the one-pole notch filter analyzed in [1], is proposed as computationally effective solution for interference detection and mitigation. The notch filter structure and the adaptive algorithm employed for tracking the disturbing signal are analyzed, and an interference detection unit, based on the adaptive algorithm convergence, is proposed. The two-pole notch filter coupled with the detection unit is used as elementary block for the design of a multi-pole notch filter that can efficiently mitigate more than one CW interference. Theoretical and simulative analyses show the feasibility and the good performance of the proposed method.

关键词： Interference adaptive algorithm Global Positioning System Satellite navigation systems adaptive filters Signal analysis algorithm design and analysis adaptive signal detection Analytical models Performance analysis

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Cascade Sliding Mode Torque Control of a Permenant Magnet Synchronous Motor

Cascade Sliding Mode Torque Control of a Permenant Magnet Sy...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： A. A. Hassan Y. S. Mohamed E. G. Shehata Electrical Engineering Department Faculty of Engineering El Minia University Egypt

This paper presents the direct torque control (DTC) of an interior permanent magnet synchronous motor (IPMSM) based on sliding mode technique. Two adaptive sliding mode controllers are designed; one is used for regulating the motor speed and the other is dedicated for controlling the electromagnetic torque. Consequently, the demerits of classical DTC (large torque and current ripples due to sector changes, low speed problems, and sensitivity to uncertainties) could be avoided in the proposed scheme. The control law of each sliding controller has been designed in such a way that the chattering effects associated with the classical sliding mode are reduced to a great extent. Also, the reaching phase could be eliminated using the idea of total sliding mode control. Moreover, a simple adaptive algorithm is used to estimate the upper bound of lumped uncertainty. The stability analysis of the proposed control system is carried out using Lyapunov stability theorem. The feasibility and effectiveness of the proposed system have been demonstrated through computer simulations. A comparison between the proposed system and conventional techniques has been made in order to confirm the validity of the proposed approach. The superiority of the proposed system has been proved through comparative simulation results.

关键词： Torque control Synchronous motors Sliding mode control Permanent magnet motors Uncertainty Programmable control adaptive control adaptive algorithm Upper bound Stability analysis

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Speech Enhancement in Functional MRI Environment using adaptive Sub-Band algorithms

Speech Enhancement in Functional MRI Environment using Adapt...

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

作者： Venkat R. Ramachandran Govind Kannan Ali A. Milani Issa M. S. Panahi Department of Electrical Engineering University of Texas Dallas Richardson USA

Very high level of acoustic noise in fMRI scanner rooms disrupts speech communication between the subject and the physician/researcher. Enhancing speech in such an environment is challenging due to the broadband and dynamic nature of the noise. Sub-band adaptive methods prove to be very effective in cancelling such noise. In this paper we present the results of using sub-band adaptive methods for enhancing speech corrupted by noise from a 3-Tesla fMRI scanner. We also observe that the performance depends on the synthesis filter bank structure.

关键词： Speech enhancement Magnetic resonance imaging Acoustic noise Noise cancellation adaptive filters Working environment noise Speech synthesis Least squares approximation Magnetic noise adaptive algorithm

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Blind adaptive multiuser detection with probabilistic algorithms: application to underwater acoustics

Blind adaptive multiuser detection with probabilistic algori...

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

作者： C. Anton-Haro J.A.R. Fonollosa Z. Zvonar J.R. Fonollosa Dpt. of Signal Theory and Communications Universitat Poliltècnica de Catalunya Barcelona Spain

In this paper, two probabilistic adaptive algorithms for jointly detecting active users in a DS-CDMA system are compared. The first one, which is based on the theory of hidden Markov models (HMM) is proposed within the CDMA scenario and compared with the previously developed Viterbi-based algorithm. Both techniques are completely blind in the sense that no knowledge of the signature sequences, channel state information or training sequences is required for any user. After convergence, an estimate of the signature of each user convolved with its physical channel impulse response (CIR), and estimated data sequences are provided. This CIR estimate can then be used to switch to any decision-directed (DD) adaptation scheme. Performance of the algorithms is verified with simulations as well as with experimental data from an underwater acoustics (UWA) environment. In both cases, performance is found to be highly satisfactory, showing the near-far resistance of the analyzed algorithms.

关键词： Multiuser detection Hidden Markov models Multiaccess communication Switches adaptive algorithm Channel state information Convergence Underwater acoustics Performance analysis algorithm design and analysis

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adaptive Engine Control

Adaptive Engine Control

引用

American Control Conference (ACC)

作者： Craig Nesbit J. K. Hedrick Department of Mechanical Engineering University of California Berkeley CA USA

Robustness is a major consideration in any controls application. A controller that goes unstable with only a slight disturbance is useless especially in the harsh environment of an automobile. Therefore any scheme that increases the robustness without harming response time is very welcome. Adaptation is one such scheme and in our case we have two slowly varying values that lend themselves to it. Our original control scheme is a two surface sliding control that reduces the relative order to one. Therefore the adaptive derivations follow a standard sliding derivation. This derivation results in two adaptive laws that are implemented in both simulation and on a microprocessor controlled car engine.

关键词： Programmable control adaptive control Engines Manifolds Torque Control systems Surface treatment Pressure control adaptive algorithm Equations

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