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Time-of-arrival estimation for IR-UWB systems in dense multipath environment

Time-of-arrival estimation for IR-UWB systems in dense multi...

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

作者： Yizhi Xu Edward K. S. Au Albert K. Wong Qin Wang Wireless IC System Design Center HKUST Fok Ying Tung Graduate School Nansha China Modulation and Coding Department Institute for Infocomm Research Agency for Science Technology and Research Singapore Department ofElectronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong China School ofInformation Engineering University of Science and Technology of Beijing Beijing China

In this paper, a novel time-of-arrival estimation algorithm is proposed for impulse radio-based UWB systems in dense multipath environment. In particular, a dedicated ranging sequence with good cross-correlation property is proposed and a threshold-based search-back unit is introduced, with the purpose of supporting high-precision ranging even at low signal-to-noise ratio. An approximate closed-form expression on the optimal threshold is derived based on the Rayleigh statistical analysis, and its accuracy and tightness are verified by simulations. Results show that the proposed ranging scheme achieves an excellent mean absolute error performance in the order of nanoseconds without introducing too much latency.

关键词： Time of arrival estimation Matched filters Design engineering Signal to noise ratio Statistical analysis Ultra wideband technology Bandwidth Mathematical model Closed-form solution Analytical models

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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...

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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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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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Data-driven protocol off-loading for Ad hoc networking environment

Data-driven protocol off-loading for Ad hoc networking envir...

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2008 International Conference on Parallel and Distributed Processing Techniques and Applications, PDPTA 2008

作者： Aoki, Kazuhiro Ishii, Hiroshi Mizuno, Osamu Iwata, Makoto Nishikawa, Hiroaki Information Infrastructure Laboratory Inc. Saiki 210-4 Tsukuba Ibaraki 300-0028 Japan School of Information Science and Technology Tokai University Kitakaname 1117 Hiratsuka Kanagawa 259-1292 Japan NTT Information Sharing Platform Laboratories Midori-cho 3-9-11 Musashino Tokyo 180-8585 Japan Department of Information System Engineering Kochi University of Technology Tosayamada-cho Miyanokuchi 185 Kami Kochi 782-8502 Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Ten'nodai 1-1-1 Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)1601320841

Pervasive networking environment as social infrastructure has been going to become a reality, especially through the recent considerable progress of semiconductor technology. Considering the case where next generation of pervasive networking is realized over ad hoc network suitable for emergency and some tentative event, some ofauthors study about an data- driven imprementation of Ad hoc and ubiquitous communication environment. It is very important to implement effective protocol handling and routing process in Ad hoc networking environment especially. This paper describes the effectiveness ofan implementation ofprotocol off-loader using networking-oriented data-driven processors CUE (Coordinating User's requirements and engineering constraints). In Ad hoc network, it is necessary to realize connection-less protocol such as UDP/IPfor flexible routing and realtime communication. Firstly, this paper discusses data- driven implementation ofprotocol off-loader on CUE networking board to minimize overheads in protocol handling. Then this paper describes architecture of CUE-v2/CUE-v3 which is available version in CUE processors. This paper finally discusses effectiveness ofprotocol handling off-loader using CUE processor system. It shows that data-driven protocol off-loader can keep minimum turn-around time without runtime overheads.

关键词： Ad hoc networks

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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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Control of Autonomous Solid Oxide Fuel Cells Subject to Sudden Load Variations

Control of Autonomous Solid Oxide Fuel Cells Subject to Sudd...

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2008 IEEE/PES Transmission & Distribution Conference & Exposition, part 1

作者： Dong-Jing Lee Li Wang Department of Electrical Engineering and Computer Science Chair for Computer Architecture and System Programming National Cheng Kung University Tainan Taiwan

This paper presents dynamic behaviors of autonomous solid oxide fuel cells (SOFC) with AC bus control. Both voltage and frequency control are utilized to achieve load-sharing of the studied SOFC feeding isolated loads. A DC-to-DC converter is connected to the output terminals of the studied SOFC for stabilizing output voltage and current fluctuations under different loading conditions. The PWM inverter connected to the output terminals of the DC-to-DC converter is operated under voltage-controlled mode to regulate the voltage profile across the connected loads. It can be concluded from the simulation results that the proposed voltage and frequency droop controllers of the PWM inverter may operate satisfactory under stand-alone mode.

关键词： Solid oxide fuel cells (SOFC) DC-to-DC converter PWM inverter Stand-alone mode

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Pointwise Logic on Completely Distributive Lattices and Approximate Reasoning

Pointwise Logic on Completely Distributive Lattices and Appr...

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International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Yalin Zheng Guang Yang Jing Zheng Jinsheng Xing State Key Laboratory for Intelligent Technology and Systems Department of Automation Faculty of Information Science and Technology Tsinghua University Beijing China Research Center of Intelligent Information Technology Department of Computer Science and Technology Faculty of Software Dongguan University of Science and Technology Dongguan China Research Center of Dongguan Economy Department of Economy and Commerce Dongguan University of Science and Technology Dongguan China Faculty of Mathematics and Computer Science Shanxi Normal University Linfen China Research Center of System Engineering Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an China

In this paper, we propose the basic framework of point- wise topological logic on completely distributive lattices and explore approximate reasoning in it. The logic of this paper is based on pointwise characterization, therefore the pointwise conception is pervasive. We explore approximate reasoning in abstract logical framework Fl on completely distributive lattice L. We propose the structure of point- wise topological logic F TL , the structure of matching function sigma. and the structure of matching neighborhood group. We investigate approximate reasoning in pointwise topological logic F TL with matching function sigma, develop pointwise topological algorithm of simple approximate reasoning, introduce the essential characteristics of this scheme.

关键词： Lattices Fuzzy logic computer science Knowledge engineering Fuzzy systems Information technology Laboratories Intelligent systems Automation Information science

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Design of an air-air negotiation protocol to reorder aircraft arrivals sequence

Design of an air-air negotiation protocol to reorder aircraf...

引用

Conference on Digital Avionics systems (DASC)

作者： Jose Miguel Canino Luis Gomez Jesus Garcia Juan Besada Jose Ramon Casar Signal and Communications Department and Electronic Engineering Department Universidad de Las Palmas de Gran Canaria Las Palmas Spain Computer Science Department Universidad Carlos III de Madrid Madrid Spain Signal System and Radiocommunication Department Universidad Politécnica de Madrid Madrid Spain

Future air traffic is demanding innovative procedures and systems that take advance of new technologies capabilities. Especially significant are new procedures and systems for automating arrival air traffic operations in terminal areas. In this work, we present an air-air negotiation protocol to be used as a new component of the on board automation system for self-spacing flight operation for merging and in-trail separation in terminal area. Current works about such systems are centered on helping to the flight crew (FC) to maintain aircraft-aircraft in-trail separation. However it is necessary integrating in these systems new capabilities that allow decentralized flight procedures to achieve air-air agreements that provide local rearrangement of a predefined aircraft arrival sequence when operational circumstances makes it recommendable. The suggested air-air negotiation protocol can be considered as an extension of capabilities of the current aircraft separation assurance system (ASAS). It has been modeled under the agent-oriented programming paradigm and an ad-hoc multi-agent platform has been used for its implementation and preliminary evaluation.

关键词： Protocols Aircraft Air traffic control Automation Aerospace electronics Merging Automatic control Control systems Aerospace control Trajectory

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Solving Sum and Product Riddle via BDD-Based Model Checking

Solving Sum and Product Riddle via BDD-Based Model Checking

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Xiangyu Luo Kaile Su Abdul Sattar Yan Chen Tsinghua National Laboratory for Information Science and Technology Key Laboratory of Security for Information System of Ministry of Education School of Software Tsinghua University Beijing China Department of Computer Science Guilin University of Electronic and Technology Guilin China School of Electronics Engineering and Computer Science Peking University Beijing China Institute for Integrated and Intelligent Systems Griffith University Brisbane QLD Australia

We model the sum and product riddle in public announcement logic, which is interpreted on an epistemic Kripke model. The model is symbolically represented as a finite state program with n agents. A model checking method to the riddle is developed by using the BDD-based symbolic model checking algorithm for logic of knowledge we developed in [7]. The method is implemented by extending the model checker MCTK [7] and then the solution of the riddle is verified successfully.

关键词： Data structures Boolean functions IEEE news Intelligent agent Educational technology Automatic logic units Laboratories computer science Information science computer security

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Generation of random channel specifications for channel routing problem

Generation of random channel specifications for channel rout...

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International Conference on computer and Information Technology (ICCIT)

作者： Achira Pal Tarak N. Mandal Alak K. Datta Debojit Kundu Rajat K. Pal Harinavi Subhasini Balika Sikshalaya Kolkata West Bengal India IBM India Pvt. Ltd. Kolkata India Department of Computer and System Sciences Birbhum West Bengal India HCL Technologies Ltd. Noida Uttar Pradesh India Department of Computer Science and Engineering University of Calcutta Kolkata India

In this paper we develop algorithms for generating random channel specifications of channel routing problem in VLSI design. A channel is a rectangular routing region containing two sets of fixed terminals on two of its opposite sides and the other two opposite sides (of the rectangle) are open ends, may or may not contain any terminal of a net but the terminal position is not fixed before a routing solution is computed. Most of the problems in two-, three-, and multi-layer channel routing are beyond polynomial time computable. Hence for each of these problems it is unlikely to design a polynomial time deterministic algorithm. Developing heuristic algorithm might be a probable way out that hopefully provides good solutions for most of the instances occur in practice. Novelty of a heuristic algorithm is judged better if it works for a variety of large number of randomly generated instances of the problem. In fact, convergence of results of a heuristic algorithm is well established when the algorithm of a problem is executed for a huge number of randomly generated similar instances and the final result is computed making an average on all of them.

关键词： Routing Polynomials Algorithm design and analysis Heuristic algorithms Very large scale integration Random number generation Crosstalk Information technology Cities and towns computer science

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