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Impacts of CFO, IQ Imbalance and Phase Noise on the system performance in OFDM systems

Impacts of CFO, IQ Imbalance and Phase Noise on the system p...

The 11th IEEE International Conference on Communications systems(第11届电子和电气工程师协会国际通信系统会议)(IEEE ICCS 2008)

作者： Rong Zhang Edward K.S.Au Roger S.Cheng Wireless IC System Design Center HKUST Fok Ying Tung Graduate SchoolNanshaChina Modulation and Coding Department Institute for Infocomm ResearchA*STARSingapore Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology

OFDM systems are sensitive to front-end imperfections including CFO, IQ imbalance and phase noise. In practice, these imperfections are inevitable and would lead to significant performance degradation. In this paper, a general closed-form expression on average signal-to-interference-and-noise ratio (SINR) over multipath fading channels is derived for performance evaluation. When additive white Gaussian noise channels and flat fading channels are considered, the expression reduces to an exact expression and a tight upper bound, respectively. Our results show that the average SINR is inversely proportional to these front-end non-idealities.

关键词： Phase noise system performance OFDM modulation Signal to noise ratio Fading AWGN Modulation coding Degradation Closed-form solution Additive white noise

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Prediction of protein sub-cellular localization using information from texts and sequences

Prediction of protein sub-cellular localization using inform...

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2008 Current Trends in Biomedical Natural Language Processing, BioNLP 2008

作者： Chun, Hong-Woo Yamasaki, Chisato Saichi, Naomi Tanaka, Masayuki Hishiki, Teruyoshi Imanishi, Tadashi Gojobori, Takashi Kim, Jin-Dong Tsujii, Jun'Ichi Takagi, Toshihisa Database Center for Life Science Research Organization of Information and System University of Tokyo Engineering 12th Bldg. 2-11-16 Yayoi Bunkyo-ku Tokyo113-0032 Japan Japan Biological Information Research Center Japan Biological Informatics Consortium Japan Biological Information Research Center National Institute of Advanced Industrial Science and Technology Japan Department of Computer Science University of Tokyo Japan Graduate School of Information Science and Technology Hokkaido University Japan Center for Information Biology DNA Data Bank of Japan National Institute of Genetics United Kingdom School of Informatics University of Manchester United Kingdom National Centre for Text Mining United Kingdom Department of Computational Biology University of Tokyo Japan

ISBN: (纸本)9781932432114

关键词： Proteins

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Coupled-ring reflector laser diodes composed of squared ring waveguides

Coupled-ring reflector laser diodes composed of squared ring...

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IEEE/LEOS International Conference on Optical MEMS

作者： Suhyun Kim Doo Gun Kim Nadir Dagli Youngchul Chung Young Tae Byun Intelligent System Research Division Korea Institute of Science and Technology Seoul South Korea Department of Electronics and Communication Engineering Kwangwoon University Seoul South Korea School of Electronic and Electrical Engineering Chung Ang University Seoul South Korea Department of Electrical and Computer Engineering University of California Santa Barbara USA

Coupled-ring reflector laser diodes composed of squared ring waveguides are fabricated and it is demonstrated that the laser diodes exhibit single mode operation and 15 nm tuning range with SMSR exceeding 25 dB.

关键词： Semiconductor lasers Optical ring resonators Optical waveguides Ring lasers Waveguide lasers Semiconductor diodes Mirrors

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ARCA: An Algorithm for Mining Association Rules based Concept Lattice

ARCA: An Algorithm for Mining Association Rules based Concep...

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The 4th International Conference on Wireless Communications, Networking and Mobile Computing(第四届IEEE无线通信、网络技术及移动计算国际会议)

作者： Qing Xia Zhen Chen Sujing Wang Tao Lv Dongjing Wang Library Huaihai Institute of Technology Lianyungang China 222005 College of Computer Science and Technology Jilin University Changchun China 130012 Weapon System Engineering Center Artillery Command Academy XuanHua China 075100 Shizhuang Middle School Lianyungang China 222200

Association rule discovery is one of kernel tasks of data mining. Concept lattice, induced from a binary relation between objects and features, is a very useful formal analysis tool. It represents the unification of concept intension and extension. It reflects the association between objects and features, and the relationship of generalization and specialization among concepts. There is a one-to-one correspondence between concept intensions and closed frequent itemsets. This paper presents an efficient algorithm for mining association rules based concept lattice called Arca (Association Rule based Concept lAttice). Arca algorithm uses concept-matrix to build a part of concept lattice, in which the intension of every concept be put into one-to-one correspondence with a closed frequent itemset. Then all association rules are discovered by 4 operators which are defined in this paper performed on these concepts.

关键词： Concept lattice rank of matriz formal concept analysis

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Side-mode Suppressed Multiwavelength Fiber Laser and Broadcast Transmission

Side-mode Suppressed Multiwavelength Fiber Laser and Broadca...

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Optical Fiber Communication (OFC) Conference

作者： Kwanil Lee Sang Bae Lee Ju Han Lee Chul Han Kim Young-Geun Han Intelligent System Research Division Korea Institute of Science and Technology Seoul South Korea School of Electrical and Computer Engineering University of Seoul Seoul South Korea BK21 Division of Advanced Research and Education in Physics Hanyang University Seoul South Korea

We demonstrate a side-mode suppressed multi-wavelength fiber laser by use of a semiconductor optical amplifier (SOA) with a coupled ring cavity configuration. Using this light source, we have experimentally investigat... 详细信息

ISBN: (纸本)9781557528599

关键词： Fiber lasers Broadcasting Optical fiber polarization Ring lasers Erbium-doped fiber lasers Optical fiber couplers Laser modes Optical fibers Semiconductor optical amplifiers Optical fiber testing

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Design and Implementation of a JXTA-Overlay P2P system and Smart Box Environment

Design and Implementation of a JXTA-Overlay P2P System and S...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Keita Matsuo Leonard Barolli Fatos Xhafa Akio Koyama Arjan Durresi Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology (FIT) Fukuoka Japan Department of Information and Communication Engineering Fakuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology (FIT) Higashi-Ku Fukuoka Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer and Information Science Indiana University Perdue University Indianapolis Indianapolis IN USA Department of Computer Science and Information Engineering Tokyo Denki University Hatoyama Saitama Japan Department of Computers and System Engineering Tokyo Denki University Saitama Japan

In this paper, we present the design and implementation of the JXTA-based e-Learning P2P system. We also show the design and implementation of a smart box environment that will be used for stimulating the learners to increase the learning efficiency. The smart box is intended to be integrated with our P2P system as a useful tool for monitoring and controlling learners' activity. Finally, it is also useful to evaluate the feasibility of our P2P platform to integrate different computational devices.

关键词： Electronic learning Monitoring Control systems

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Implementation and Design of New Functions for a Web-Based E-learning system to Stimulate Learners Motivation

Implementation and Design of New Functions for a Web-Based E...

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International Conference on Complex, Intelligent and Software Intensive systems, CISIS

作者： Keita Matsuo Leonard Barolli Fatos Xhafa Akio Koyama Arjan Durresi Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering FIT Fukuoka Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer and Information Science Purdue University Indiana University Indianapolis IN USA Department of Computers and System Engineering Tokyo Denki University Hatoyama Saitama Japan

Due to the opportunities provided by the Internet, people are taking advantage of e-learning courses and during the last few years enormous research efforts have been dedicated to the development of e-learning systems. So far, many e-learning systems are proposed and used practically. However, in these systems the e-learning completion rate is low. One of the reasons is the low study desire and motivation. In our previous work, we implemented a e-learning system that is able to increase the learning efficiency by stimulating learners motivation. In this work, we designed and implemented new functions to improve the system performance.

关键词： Electronic learning Electronic mail Materials Distance learning computers History Cellular phones

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Name disambiguation using many-to-one features

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Journal of Computational Information systems 2007年第4期3卷 1719-1724页

作者： Liu, Yuan He, Jing Yao, Conglei Computer Networks and Distributed System Laboratory School of Electronic Engineering and Computer Science Peking University Beijing 100000 China

As the Web increase drastically, more and more entity information come to appear on Web, including their profile information, their web log containing their idea, activity, speech and so on. However, there are many entities sharing same names. Such entities include persons, locations and so on. This paper presents an approach to estimate the number of entities sharing same name by employing many-to-one features. The basic idea is that the entities are not likely to share all other features even if they have the same name. We list some strategies for selecting key features, present an approach to extract the features on Web, and combine them to estimate the entity number. What is more, we also give a method to identify the fake information which will confuse us and filter them.

关键词： Information retrieval

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OPTIMIZATION OF PLASTIC INJECTION MOLDING PROCESS VIA TAGUCHI'S PARAMETER DESIGN METHOD, BPNN, AND DFP

OPTIMIZATION OF PLASTIC INJECTION MOLDING PROCESS VIA TAGUCH...

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2008 International Conference on Machine Learning and Cybernetics(2008机器学习与控制论国际会议)

作者： W.C.CHEN M.W.WANG G.L.FU C.T.CHEN Graduate School of Industrial Engineering and System Management Chung Hua University No.707 Sec.2 Department of Mechanical Engineering National Kaohsiung University of Aapplied Sciences415 Chien Ku Graduate Institute of Technology Management Chung Hua University No.707 Sec.2 Wu Fu Rd. Hsinchu Department of Computer Science and Information Engineering Ta Hwa Institute of Technology 1 Tahwa

This research integrates Taguchi's parameter design method, back-propagation neural networks (BPNN), and Davidon-Fletcher-Powell (DFP) method to optimize the process parameter settings of plastic injection molding. Taguchi's parameter design method is used to arrange an orthogonal array experiment and to reduce the number of set-test cycles. Injection Time, Velocity Pressure Switch Position, Packing Pressure, and Injection Velocity are selected as process control parameters and product weight is selected as the single product quality. The experimental data of Taguchi's parameter design method are used for effectively training and testing BPNN. Then, BPNN is combined with DFP to search out the final optimal process parameter settings. Finally, a confirmation experiment is performed to confirm the effectiveness of the final optimal process parameter settings. The experimental results show that the proposed effective process parameter optimization approach can avoid shortcomings inherent in the application of trial-and-error processes or the conventional Taguchi parameter design method. Furthermore, the proposed approach can effectively assist engineers in determining optimal initial process parameter settings and achieving competitive advantages on product quality and costs.

关键词： Plastic injection molding Back-propagation neural networks Taguchi's parameter design Davidon-Fletcher-Powell method

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Fault Distribution Modeling Using Stochastic Bivariate Models For Prediction of Voltage Sag in Distribution systems

Fault Distribution Modeling Using Stochastic Bivariate Model...

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2008 IEEE/PES Transmission & Distribution Conference & Exposition, part 2

作者： Bach Quoc Khanh Dong-Jun Won Seung-Il Moon Electric Power System Department Electricity Faculty Hanoi University of Technology Hanoi Vietnam School of Electrical Engineering INHA University Incheon South Korea School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

This paper presents a new method on fault distribution modeling for stochastic prediction study of voltage sags in the distribution system. Two-dimensional stochastic models for fault modeling make it possible to obtain the fault performance for the whole system of interest, which helps obtaining not only sag performance at individual locations but also system sag performance through system indices of voltage sag. By using bivariate normal distribution for fault distribution modeling, the paper estimates the influence of model parameters on system voltage sag performance. The paper also develops the modified SARFI{sub}X regarding phase loads that creates better estimation for voltage sag performance for distribution system.

关键词： Distribution system Power quality Voltage sag frequency Stochastic prediction Fault distribution modeling Bivariate normal distribution Phase loads

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