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Performance analysis of MAC protocol for cooperative MIMO transmissions in WSN

Performance analysis of MAC protocol for cooperative MIMO tr...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Mohd Riduan Ahmad Eryk Dutkiewicz Xiaojing Computer Engineering Department Universiti Teknikal Malaysia Melaka Melaka Malaysia Faculty of Informatics University of Wollongong NSW Australia University of Wollongong Wollongong NSW AU

Cooperative Multi-In Multi-Out (MIMO) schemes can reduce both transmission energy and latency in distributed wireless sensor networks (WSNs). When circuit energy is considered in such networks, the total energy consumed as the number of cooperating nodes increases becomes of particular interest. In addition, most of the previous works focused only on space-time-block-code (STBC) schemes and ignore other MIMO schemes. In this paper we present a comparison study of three cooperative MIMO schemes: beamforming (BF), STBC and spatial multiplexing (SM) where both the transmission and circuit energies are considered. We consider a wireless sensor network operating in quasi-static Rayleigh fading channels with M cooperating transmit nodes and N cooperating receive nodes. We show that the single-in-single-out (SISO) scheme is more energy-efficient and has lower packet latency at higher regions of transmission power while the three cooperative MIMO schemes are more energy-efficient and outperform the SISO scheme at the lower regions. From our analysis, we can conclude that, beamforming outperforms both the SM and STBC schemes in term of energy-efficiency and lower packet latency. Also we suggest that the beamforming scheme utilising two transmit nodes results in an efficient cooperative system.

关键词： Performance analysis Media Access Protocol MIMO Wireless sensor networks Delay Array signal processing Energy efficiency Circuits Samarium Fading

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A formal framework of reconfigurable control based on model checking

A formal framework of reconfigurable control based on model ...

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2008 American Control Conference (ACC), vol.10

作者： He-xuan Hu Anne-lise Gehin Mireille Bayart Languages Informatics Systems and Software Engineering Department Faculty of Computer Science Université des Sciences et Technologies de Lille Villeneuve d'Ascq France

This paper proposes a formal framework for reconfigurable control, based on model checking. This framework first generates a flexible model (i.e., an execution structure) according to the diagnosis, then defines a temporal specification language to deal with the problems due to infinite execution cycles and non-determinism, and finally provides the algorithms that will automatically verify whether the updated model satisfies the desired specification.

关键词： Automatic control Control systems Specification languages Actuators Fault tolerance Performance loss Redundancy Safety Reconfigurable logic Databases

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Image compression with anisotropic diffusion

Image compression with anisotropic diffusion

引用

作者： Galić, Irena Weickert, Joachim Welk, Martin Bruhn, Andrés Belyaev, Alexander Seidel, Hans-Peter Mathematical Image Analysis Group Faculty of Mathematics and Computer Science Saarland University Saarbrücken 66041 Germany Max-Planck Institute for Informatics Stuhlsatzenhausweg 85 Saarbrücken 66123 Germany EECE School of Engineering and Physical Sciences Heriot-Watt University Riccarton Edinburgh EH14 4AS United Kingdom

Compression is an important field of digital image processing where well-engineered methods with high performance exist. Partial differential equations (PDEs), however, have not much been explored in this context so far. In our paper we introduce a novel framework for image compression that makes use of the interpolation qualities of edge-enhancing diffusion. Although this anisotropic diffusion equation with a diffusion tensor was originally proposed for image denoising, we show that it outperforms many other PDEs when sparse scattered data must be interpolated. To exploit this property for image compression, we consider an adaptive triangulation method for removing less significant pixels from the image. The remaining points serve as scattered interpolation data for the diffusion process. They can be coded in a compact way that reflects the B-tree structure of the triangulation. We supplement the coding step with a number of amendments such as error threshold adaptation, diffusion-based point selection, and specific quantisation strategies. Our experiments illustrate the usefulness of each of these modifications. They demonstrate that for high compression rates, our PDE-based approach does not only give far better results than the widely-used JPEG standard, but can even come close to the quality of the highly optimised JPEG2000 codec.

关键词： Image compression

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A Robust Descriptor based on Weber's Law

A Robust Descriptor based on Weber's Law

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26th IEEE Conference on computer Vision and Pattern Recognition (CVPR 2008), vol.8

作者： Jie Chen Shiguang Shan Guoying Zhao Xilin Chen Wen Gao Matti Pietikainen School of Computer Science and Technology Harbin Institute of Technology Harbin China Machine Vision Group Department of Electrical and Information Engineering University of Oulu Finland Languages Informatics Systems and Software Engineering Department Faculty of Computer Science Chinese Academy and Sciences Beijing China

Inspired by Weber's Law, this paper proposes a simple, yet very powerful and robust local descriptor, Weber Local Descriptor (WLD). It is based on the fact that human perception of a pattern depends on not only the change of a stimulus (such as sound, lighting, et al.) but also the original intensity of the stimulus. Specifically, WLD consists of two components: its differential excitation and orientation. A differential excitation is a function of the ratio between two terms: One is the relative intensity differences of its neighbors against a current pixel;the other is the intensity of the current pixel. An orientation is the gradient orientation of the current pixel. For a given image, we use the differential excitation and the orientation components to construct a concatenated WLD histogram feature. Experimental results on Brodatz textures show that WLD impressively outperforms the other classical descriptors (e.g., Gabor). Especially, experimental results on face detection show a promising performance. Although we train only one classifier based on WLD features, the classifier obtains a comparable performance to state-of-the-art methods on MIT+CMU frontal face test set, AR face dataset and CMU profile test set.

关键词： Robustness Face detection Humans Content addressable storage Testing Psychology Laboratories Machine intelligence Information processing computers

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MAC Protocol for Cooperative MIMO Transmissions in Asynchronous Wireless Sensor Networks

MAC Protocol for Cooperative MIMO Transmissions in Asynchron...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Mohd Riduan Ahmad Eryk Dutkiewicz Xiaojing Huang Computer Engineering Department FKEKK Universiti Teknikal Malaysia Melaka Malacca Malaysia Wireless Technologies Lab TITRSECTEFaculty of Informatics University of Wollongong NSW Australia

Cooperative MIMO schemes can reduce both transmission energy and latency in distributed wireless sensor networks (WSNs). In this paper we develop a new cooperative low power listening (LPL) medium access control (MAC) protocol for two cooperative MIMO schemes: optimal beamforming (BF) and spatial multiplexing (SM). We develop analytical models for the total energy consumption and packet latency for both schemes and analyse the proposed MAC protocol in term of the total energy consumption and packet latency with imperfect synchronisation due to clock jitter. The impact of the clock jitter, the check interval and the number of cooperative nodes on the total energy consumption and latency are investigated. We observe that the cooperative LPL MAC with Optimal BF is the most promising configuration and it is optimal when then number of co-operating nodes M=2 and jitter difference is below 0.6 Tb.

关键词： Media Access Protocol Wireless application protocol MIMO Wireless sensor networks Delay Access protocols Energy consumption Jitter Clocks Array signal processing

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Stability analysis of time-delayed single-input sliding mode control systems

Stability analysis of time-delayed single-input sliding mode...

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Annual Conference of Industrial Electronics Society

作者： Xiangjun Li Xinghuo Yu Qinglong Han Changhong Wang Department of Control Science and Engineering Harbin Institute of Technology China School of Electrical and Computer Engineering RMIT University Melbourne Australia Faculty of Business and Informatics Central Queensland University Rockhampton Australia

This paper presents stability analysis of the time-delayed equivalent control based single input sliding mode control systems using an LMI approach. Conditions to guarantee the boundedness of the control system trajectories under the time-delayed equivalent control based sliding mode control are obtained. Maximum upper bound of the delay time to guarantee stability is estimated. Digital simulations are conducted to verify the theoretical results.

关键词： Stability analysis Sliding mode control Control systems Delay estimation Upper bound Delay effects Communication system control Digital simulation Electrical equipment industry Industrial control

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Time-delay effect on equivalent control based single-input sliding mode control systems

Time-delay effect on equivalent control based single-input s...

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International Workshop on Variable Structure Systems, VSS

作者： Xinghuo Yu Qinglong Han Xiangjun Li Changhong Wang School of Electrical and Computer Engineering RMIT University Melbourne Australia Faculty of Business and Informatics Central Queensland University Rockhampton Australia Department of Control Science and Engineering Harbin Institute of Technology China

This paper studies the time-delay effect on the equivalent control based sliding mode control. Conditions to guarantee the boundedness of the control system steady states under the time delayed equivalent control based sliding mode control are obtained. Maximum upper bound of the delay time to guarantee boundedness is estimated. Simulations are conducted to verify the theoretical results.

关键词： Sliding mode control Control systems Delay effects Delay estimation Upper bound Communication system control Stability Steady-state Electrical equipment industry Industrial control

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A randomness based analysis on the data size needed for removing deceptive patterns

A randomness based analysis on the data size needed for remo...

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作者： Haraguchi, Kazuya Yagiura, Mutsunori Boros, Endre Ibaraki, Toshihide Department of Information Technology and Electronics Faculty of Science and Engineering Ishinomaki Senshu University Ishinomaki-shi 986-8580 Japan Department of Computer Science and Mathematical Informatics Graduate School of Information Science Nagoya University Nagoya-shi 464-8603 Japan Rutgers Center for Operations Research Rutgers University NJ 08854-8003 United States Department of Informatics School of Science and Technology Kwansei Gakuin University Sanda-shi 669-1337 Japan

We consider a data set in which each example is an n-dimensional Boolean vector labeled as true or false. A pattern is a co-occurrence of a particular value combination of a given subset of the variables. If a pattern appears frequently in the true examples and infrequently in the false examples, we consider it a good pattern. In this paper, we discuss the problem of determining the data size needed for removing "deceptive" good patterns;in a data set of a small size, many good patterns may appear superficially, simply by chance, independently of the underlying structure. Our hypothesis is that, in order to remove such deceptive good patterns, the data set should contain a greater number of examples than that at which a random data set contains few good patterns. We justify this hypothesis by computational studies. We also derive a theoretical upper bound on the needed data size in view of our hypothesis. Copyright © 2008 The Institute of Electronics, Information and Communication Engineers.

关键词： Data mining

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Fast ZeroX algorithm for efficient message routing in optical multistage interconnection networks

Fast ZeroX algorithm for efficient message routing in optica...

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International Conference on computer and Communication engineering, ICCCE

作者： Tengku Dian Shahida Mohamed Othman Mohamad Khazani Department of Communication Technology and Network Faculty of Computer Science and Information Technology Malaysia Lab of Computational Science and Informatics Universiti Putra Malaysia Department of Computer and Communication Technology Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Computer and Communication Technology UPM Serdang Selangor D.E. Malaysia

Based on the ZeroX algorithm, we proposed a fast and efficient crosstalk-free algorithm called the Fast ZeroX algorithm for solving optical crosstalk problem in omega networks. In our approach, we introduced the concept of inverse conflict matrix (iCM), another representation of a conflict matrix in which it summarizes all possible conflicts between each node in the network. Using iCM, the ZeroX algorithm is simplified, thus improved by reducing the time needed for routing process. From our simulation results, it is shown that our approach yields better performance in terms of minimal routing time in comparison to the original ZeroX algorithm.

关键词： Routing Optical interconnections Optical fiber networks Multiprocessor interconnection networks Optical crosstalk Scheduling algorithm Heuristic algorithms computer networks Optical computing Communications technology

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Investigation of fuzzy models for the valuation of residential premises using the KEEL tool

Investigation of fuzzy models for the valuation of residenti...

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8th International Conference on Hybrid Intelligent Systems, HIS 2008

作者： Lasota, Tadeusz Mazurkiewicz, Jacek Trawinski, Bogdan Trawinski, Krzysztof Agricultural University of Wroclaw Faculty of Environmental Engineering and Geodesy C.K. Norwida 25/27 50-375 Wroclaw Poland Wroclaw University of Technology Institute of Computer Engineering Control and Robotics Wybrzeze S. Wyspianskiego 27 50-370 Wroclaw Poland Wroclaw University of Technology Institute of Applied Informatics Wybrzeze S. Wyspianskiego 27 50-370 Wroclaw Poland Wroclaw University of Technology Faculty of Electronics Wybrzeze S. Wyspianskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9780769533261

A series of experiments aimed to generate and learn fuzzy models for the valuation of residential premises was conducted using the KEEL tool (Knowledge Extraction based on Evolutionary Learning). Four regression and four post-processing algorithms were applied to several data sets. They referred to sales/purchase transactions of residential premises, which were derived from the cadastral system and the registry of real estate transactions. The results proved the usefulness of the tool to carry out laborious and tedious investigation in a relatively short time. Further research is needed to determine to what extent data coming from such sources allow to build the real estate valuation models. © 2008 IEEE.

关键词： Housing

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