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Cross-Layer Rate control and Dynamic Scheduling in Mobile Ad Hoc Networks

Cross-Layer Rate Control and Dynamic Scheduling in Mobile Ad...

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Xu-Na Miao Xian-wei Zhou Li-Ping Du Lin Lin Department of Communication Engineering University of Science and Technology Beijing Beijing P. R. China

This paper considers an issue joint rate control and dynamic scheduling in mobile ad hoc networks. We propose a cross-layer rate control scheme that jointly computes both the rate allocation and dynamic scheduling. The scheduling in ad hoc networks is a difficult problem and in general NP-hard, or requires centralized implementation. In this paper, we present a dynamic approximation algorithm adapted to mobile ad hoc networks. We study the case with dynamic arrivals and departures of the users. It is for the first time in the literature that the rescheduling is introduced to the network scheduling, and this rescheduling method can adapt to topology environment changed with high frequency. So this dynamic scheduling can suit the mobile ad hoc networks.

关键词： Dynamic scheduling Mobile ad hoc networks communication system control Ad hoc networks Processor scheduling Scheduling algorithm Network topology Cross layer design Routing Utility programs

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Distributed Coordination Protocol for Common control Channel Selection in Multichannel Ad-Hoc Cognitive Radio Networks

Distributed Coordination Protocol for Common Control Channel...

引用

IEEE international conference on Wireless and Mobile computing, networking And communications (WiMob)

作者： Mi-Ryeong Kim Sang-Jo Yoo The Graduate School of Information and Telecommunications Inha University Incheon South Korea

The exponential growth in wireless services has resulted in an overly crowded spectrum. The current state of spectrum allocation indicates that almost all usable frequencies have already been occupied. This makes one pessimistic about the feasibility of integrating emerging wireless services such as large-scale sensor networks into the existing communication infrastructure. Cognitive radio is the emerging dynamic spectrum access technology to achieve open spectrum sharing flexibly and efficiently. It is an intelligent wireless communication system that is aware of its radio environment and is capable of adapting its operation to statistical variations of the radio frequency. Ad-hoc networks in terms of cognitive radio rely on a common control channel (CCC) for operation. control signals are used to enable cooperation communicate through a common control channel. However, common control channel may not be always available in an open spectrum allocation scheme due to interference and coexistence with primary systems (PS) of the spectrum. In this paper, we propose a novel common control channel selection protocol (DCP-CCC) in a distributed way based on appearance patterns of PS and connectivity among nodes. Using simulation results, we evaluate the performance of the proposed CCC selection scheme.

关键词： Protocols Radio control Cognitive radio Wireless sensor networks communication system control Intelligent sensors Radio spectrum management Large scale integration Intelligent systems Wireless communication

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Autoregressive Channel Prediction Model for Cognitive Radio

Autoregressive Channel Prediction Model for Cognitive Radio

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Chunli Dong Yuning Dong Li Wang College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Dept. of Information Engineering Nanjing College of Traffic Vocational Technology Nanjing China College of Communication and Information Engineering Suzhou University Suzhou China Office of College Nanjing College of Traffic Vocational Technology Nanjing China

An autoregressive channel prediction model is presented for cognitive radio systems. This model adopts a second-order AR model and a particle filter. In this paper, an AR model of order p is used to approximate the flat Rayleigh fading channels. Simulation results show that the performance of the proposed autoregressive channel prediction model based on particle filtering is better than that of Kalman filtering.

关键词： Predictive models Cognitive radio Filtering Educational institutions Fading Kalman filters Wireless communication State estimation Telecommunication traffic Traffic control

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A Network-Coding Method to Improve the Performance of Opportunistic Networks

A Network-Coding Method to Improve the Performance of Opport...

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Kefeng Fan Jinhuai Guo Zhaofeng Ma Yixian Yang Xinxin Niu Beijing University of Posts and Telecommunications Beijing Beijing CN Department of Communication Engineering Zhengzhou Information Science and Technology Institute Zhengzhou China

Because connectivity usually can not be guaranteed, delay performance is mostly poor for opportunistic networks. And network partition is the regular phenomenon for multi-hop wireless networks although the source node in partition district can transmit information by mobile node. Then the delay performance based on network coding is studied for the above network environment and an efficient network coding unit and the distribution strategy of arrive intensity are proposed. Simulation results show the proposed method can meet the delay requirement of opportunistic network communication.

关键词： Vehicles Laboratories Telecommunication traffic Traffic control Network coding Intelligent sensors Information security Telecommunication switching communication switching Information science

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2nd IFIP international conference on Computer and computing Technologies in Agriculture, CCTA 2008

引用

2nd IFIP international conference on Computer and computing Technologies in Agriculture, CCTA 2008

ISBN: (纸本)9781441902122

The proceedings contain 82 papers. The special focus in this conference is on Computer and computing Technologies in Agriculture. The topics include: The research of computer aided farm machinery designing method based on ergonomics;estimating the paddy spike yield using fractal dimension;development of a model for disseminating agricultural technology information based on signaling theory;transient analysis of a BLDC starter/generator system used in electric vehicles;design of single-phase power meter based on Ethernet;automatic assembly of combined checking fixture for auto-body components based on fixture elements libraries;study on aging and damage evaluation system of seepage control canal with concrete;the mechanisms of agricultural risks management and its researching frame;determination of iron in milk powder by microwave digestion and flame atomic absorption spectrophotometry;efficient bar-code watermark system to protect agricultural products information and copyright;a comparison of linear regression methods for the detection of apple internal quality by near infrared spectroscopy;cost-benefit analysis of HACCP implementation in the Chinese slaughtering and meat product processing industry;nondestructive detection of the internal quality of apple using x-ray and machine vision;identification of traceability barcode based on phase correlation algorithm;studies on the rapid methods for evaluating seed vigor of sweet corn;level of adoption of quality management systems into the Mexican pork industry and implementation of HACCP in the Mexican poultry processing industry.

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A Novel Technique for English Font Recognition Using Support Vector Machines

A Novel Technique for English Font Recognition Using Support...

引用

international conference on advances in Recent Technologies in communication and computing, ARTCom

作者： R. Ramanathan K.P. Soman L. Thaneshwaran V. Viknesh T. Arunkumar P. Yuvaraj Department of Electronics & Communication Engineering Amrita Viswavidyapeetham University Coimbatore India Center for Excellence in Computational Engineering and Networking (CEN) Amrita Viswavidyapeetham University Coimbatore India

Font Recognition is one of the Challenging tasks in Optical Character Recognition. Most of the existing methods for font recognition make use of local typographical features and connected component analysis. In this paper, English font recognition is done based on global texture analysis. The main objective of this proposal is to employ support vector machines (SVM) in identifying various fonts. The feature vectors are extracted by making use of Gabor filters and the proposed SVM is trained using these features. The method is found to give superior performance over neural networks by avoiding local minima points. The SVM model is formulated tested and the results are presented in this paper. It is observed that this method is content independent and the SVM classifier shows an average accuracy of 93.54%.

关键词： Support vector machines Support vector machine classification Character recognition Optical character recognition software Optical filters Proposals Feature extraction Gabor filters Neural networks Testing

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FPGA Implementation of Low Phase Noise Oscillator

FPGA Implementation of Low Phase Noise Oscillator

引用

international conference on advances in computing, control, & Telecommunication Technologies (ACT)

作者： Nitin P. Narkhede Shyamkant S. Limaye Department of Electronics & Communication Ramdeobaba Kamla Nehru Engineering College Nagpur India Department of Electronics Jhulelal Institute of Technology Nagpur India

Many DSP applications require a complex sinusoid to accomplish various signal rotation tasks. Examples include the discrete, fast Fourier transforms and digital up/down conversions. This article presents a complex oscillator based on the unfolded CORDIC algorithm and produces periodic sine and cosine samples for any specified angle increment. Low phase noise is achieved by residual angle correction unit and stability is achieved using AGC unit. The simulation and synthesis results in FPGA are presented. Fourier analysis of the output using MATLAB is also presented.

关键词： Field programmable gate arrays Phase noise Oscillators Computer architecture Stability Equations Hardware Telecommunication computing communication system control Telecommunication control

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Investigation and Development of Methods to Solve Multi-Class Classification Problems

Investigation and Development of Methods to Solve Multi-Clas...

引用

international conference on advances in Recent Technologies in communication and computing, ARTCom

作者： R. Ramanathan K.P. Soman P.A. Rohini G. Dharshana Department of Electronics & Communication Engineering Amrita Viswavidyapeetham University Coimbatore India Center for Excellence in Computational Engineering and Networking (CEN) Amrita Viswavidyapeetham University Coimbatore India

Most of the classification problems frequently encounter a multi class predicament and offers a good scope for research. This paper has a comprehensive approach to the available multi-class technique using Artificial Neural Networks and then introduces a new algorithm to overcome the demerits of the former. In addition, a new algorithm combining ANN and chameleon clustering is suggested and validated. An SVM model for the above is also proposed and sufficiently tested with a typical example i.e. Image Segmentation. Also, the permutation effects prevailing in Half -against-Half multi class algorithm of SVM is efficiently tackled by developing an algorithm using ldquocircular shift strategyrdquo and employing the same. The use of clustering methods with SVM to improve its efficiency is also discussed. All the above mentioned models are extensively analyzed and the results are presented. It is found that the proposed method is an effective alternative for existing methods and offers consistent performance.

关键词： Image segmentation Clustering algorithms Artificial neural networks Neural networks Support vector machines Bifurcation Computer networks Electronic mail Image analysis Feeds

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Channel Assignment Scheme in Hierarchical Cellular System with Multi-Beam Base-Station

Channel Assignment Scheme in Hierarchical Cellular System wi...

引用

international conference on Wireless communications, networking and Mobile computing (WiCom)

作者： Jing Yang Zu-fan Zhang Chongqing University of Posts and Telecommunications China

This paper proposed a hierarchical cellular system based on the adaptive multi-beam antenna along with a channel assignment scheme. The hierarchical cellular system is formed from the mechanism that the beams of the adaptive multi-beam antenna radiate in the vertical plane, that is to say, the adaptive multi-beam antenna of the base station can generate a cluster of concentric circles. The channels assigned the vary layer of the hierarchical cellular system is varied according the traffic density in unit area. The simulation results show that the proposed channel assignment scheme be fit for hierarchical cellular system.

关键词： Adaptive arrays Mobile communication Base stations Vehicle dynamics Mobile antennas Frequency Telecommunication traffic Traffic control Cellular networks communication networks

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Improved Technique for the Construction of Parametric M-Band Wavelets

Improved Technique for the Construction of Parametric M-Band...

引用

international conference on advances in Recent Technologies in communication and computing, ARTCom

作者： R. Ramanathan K.P. Soman Department of Electronics & Communication Engineering Amrita Viswavidyapeetham University Coimbatore India Center for Excellence in Computational Engineering and Networking (CEN) Amrita Viswavidyapeetham University Coimbatore India

Demanding applications of wavelets in OFDM modulation, watermarking, cognitive radio and wireless networks has created an immense interest amongst the researchers to work on the design of good wavelet system. Parametric and M-band wavelets draw a special attention in this category. A commensurate procedure for constructing a superior M-band parametric wavelet system is proposed in this paper. The idea of modulation matrix decomposition and the relation with corresponding polyphase matrix and its factorization is exploited to possible extent to make the design process plain and easy. The appropriate polynomial matrix is put in place to extend the filter design to any required length. The simple property of the Kroneckor product of two matrices is contemplated to achieve M-band design. This paper ponders on the above-mentioned factors and accomplishes the task of designing an M-band parametric wavelet, which is complete in itself. Few examples are used to substantiate the proposed method.

关键词： Matrix decomposition Finite impulse response filter Wavelet analysis Frequency Computer networks Design engineering Electronic mail Signal processing Bandwidth communications technology

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