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IEEE International Conference on communications (ICC)

作者： L. G. Ordonez D. P. Palomar J. R. Fonollosa Dept. of Signal Theory and Communications Technical University of Catalonia (UPC) Spain Dept. of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong China

In this paper we present a general formulation that unifies the probabilistic characterisation of Hermitian random matrices with a specific structure. Based on a unified expression for the joint pdf, we obtain (i) the joint cdf, (ii) the marginal cdf's, and (iii) the marginal pdf's of the ordered eigenvalues, where (ii) and (iii) follow as simple particularizations of (i). Our formulation is shown to include the distribution of some common MIMO channel models such as the uncorrelated and semicorrelated Rayleigh, and the uncorrelated Rician fading MIMO channel, although it is not restricted only to these. Hence, we provide a solid framework for the simultaneous analytical performance analysis of MIMO systems under different channel models. As an example of application, we obtain the exact outage probability of a spatial multiplexing MIMO system transmitting through the strongest channel eigenmodes.

关键词： Eigenvalues and eigenfunctions Performance analysis MIMO Rician channels Receiving antennas Information analysis Taylor series communications Society Solid modeling Fading

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Neural Net Water Level Trend Prediction and Dynamic Water Level Sampling Frequency

Neural Net Water Level Trend Prediction and Dynamic Water Le...

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ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Steven P. Sweeney Sehwan Yoo Albert Chi Frank Lin Taikyeong Jeong Sengphil Hong Sam Fernald Dept. of Mathematics and Computer Science University of Maryland Eastern Shore USA College of Software Engineering University of Advancing Technology USA Dept. of Communications Engineering Myongji University South Korea School of Information and Media Sung-shin Woman's University South Korea Dept. of Animal and Range Science New Mexico State University USA

ISBN: (纸本)9780769532639

We have used neural network water level trend prediction (NNWLTP) in support of a water level sensing project. The NNWLTP approach allows dynamic change in water level sampling frequency, which will reduce power consumption and extend battery life in energy constrained devices. This paper deals primarily with the NNWLTP, which would allow sampling frequency change commands to be transmitted to the sensors when a transition or turning point was detected.

关键词： Artificial neural networks Turning Digital filters Sensors Time series analysis Wireless sensor networks Java

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An architecture of photo core transform in HD photo coding system for embedded systems of various bandwidths

An architecture of photo core transform in HD photo coding s...

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Koichi Hattori Hiroshi Tsutsui Hiroyuki Ochi Yukihiro Nakamura Dept. of Communications and Computer Engineering Graduate School of Informatics Kyoto University Sakyo Kyoto Japan Dept. of Information Systems Engineering Graduate School of Information Science and Technology Osaka University Suita Osaka Japan Research Organization of Science and Engineering Ritsumeikan University Shiga Japan Research Organization of Science and Engineering Ritsumeikan University Kusatsu Shiga Japan

In this paper, we propose a novel architecture of photo core transform (PCT) which is used as transformation of image data into frequency domain in HD Photo, an emerging image coding system developed by Microsoft. In order to support various memory bus bandwidths used in system-on-a-chip (SoC) design, an implementation for each bandwidth can be derived based on our architecture. In addition, in order to reduce the local memory size and the traffic between the main and local memories, we propose a novel data transfer and storing scheme for PCT. The experimental results show that hardware modules corresponding to the given bus bandwidths can be reasonably derived from the proposed architecture.

关键词： High definition video Embedded system Bandwidth Image coding Discrete transforms Frequency domain analysis System-on-a-chip Data engineering Hardware Streaming media

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Algorithms to Managing Unicast, Multicast and Broadcast Transmission for Optical Switches

Algorithms to Managing Unicast, Multicast and Broadcast Tran...

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The 11th Asia-Pacific Network Operations and Management Symposium

作者： Dawid Zydek Leszek Koszalka Iwona Pozniak-Koszalka Keith J. Burnham Dept. of Electrical and Computer Engineering University of NevadaLas VegasUSA Chair of Systems and Computer Networks Wroclaw University of Technology50-370 WroclawPoland Control Theory and Applications Centre Coventry UniversityCV1 5FB CoventryUnited Kingdom

This paper deals with an optical switching problem concerning an architecture represented by input-output request matrix. New algorithms such as LS, Q-family and J-family are presented and thoroughly studied. J-family algorithms are some modifications of the well known Double algorithm. The study focuses on comparison between the considered algorithms and known algorithms such as Double and Exact. The local comparison criteria consist of the number of decomposed matrices, the number of empty slots, the total time of decomposition and excess. As the global index of performance the weighted penalty is introduced, which comprises local criteria. The properties of the proposed algorithms are shown on examples, where matrices with various elements are decomposed into permutation matrices (switch configurations). An idea of experimentation system and some results of investigations are presented. The properties of the considered algorithms are discussed, especially significant results for LS algorithm are described.

关键词： network transmission, algorithm, experimentation system

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Sizes of Minimum Connected Dominating Sets of a Class of Wireless Sensor networks

Sizes of Minimum Connected Dominating Sets of a Class of Wir...

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2008 IEEE International Conference on communications(ICC 2008)

作者： Chuan Heng Foh Lachlan L.H.Andrew Moshe Zukerman School of Computer Engineering Nanyang Technological UniversitySingapore 639798 Department of Computer Science California Institute of Technologylachlan AT caltech.edu ARC Special Research Centre for Ultra-Broadband Information Networks (CUBIN) EEE Dept.The University of MelbourneVictoria 3010Australia

We consider an important performance measure of wireless sensor networks,namely,the least number of nodes,N,required to facilitate routing between any pair of nodes,allowing other nodes to remain in sleep mode in orde... 详细信息

关键词： Sizes of Minimum Connected Dominating Sets of a Class of Wireless Sensor networks Sensor

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Time delay estimation in a spatially structured model using decoupled estimators for temporal and spatial parameters

Time delay estimation in a spatially structured model using ...

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ITG Workshop on Smart Antennas

作者： Felix Antreich Josef A. Nossek Gonzalo Seco A. Lee Swindlehurst German Aerospace Center (DLR) Inst. for Communications and Navigation Wessling Germany Inst. for Circuit Theory & Signal Processing Munich University of Technology (TUM) Germany Department of Telecommunication & Systems Engineering Universitat Authnòma de Barcelona Spain Dept. of Telecommunications & Systems Engineering Universitat Autonoma de Barcelona (UAB) Spain Dept. of Electrical Engineering & Computer Science The University of California Irvine CA U.S.A.

This paper deals with the joint estimation of time-delay and spatial (direction-of-arrival, DOA) parameters of several replicas of a known signal in an unknown spatially correlated field. Unstructured and structured models have been proposed for maximum likelihood (ML) estimators in the literature. The former suffers from a severe performance degradation in some scenarios, whereas the latter involves huge complexity. It is shown how the extended invariance principle (EXIP) can be applied to obtain estimates with the quality of those of the structured model, but with the complexity of the unstructured one. We present a method to improve the quality of the time-delay estimates obtained with an unstructured spatial model when an estimate of the DOAs is available. Exemplarily, simulation results for time-delay estimation for GPS (Global Positioning System) are included and confirm that our proposal approaches the Cramer-Rao lower bound (CRLB) of the structured model even when suboptimal DOA estimates obtained by ESPRIT are introduced.

关键词： Delay estimation Delay effects

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Relationship between rain front motion and site diversity in Ku-band satellite links

Relationship between rain front motion and site diversity in...

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25th AIAA International communications Satellite Systems Conference, ICSSC 2010

作者： Nakatani, Takayuki Maekawa, Yasuyuki Shibagaki, Yoshiaki Hatsuda, Ken Osaka Electro-Communication University Dept. of Telecommunications and Computer networks Neyagawa Osaka 572-8530 Japan Hakkaido Institute of Technology Dept. of Engineering Sapporo Hokkaido 006-8585 Japan

ISBN: (纸本)9781624100079

Directions and velocities of the motion of rain areas are estimated for each type of rain fronts, using time differences detected in the rain attenuation of the Ku-band satellite radio wave signals that have been measured at Osaka Electro-Communication university (OECU) in Neyagawa, Osaka, Research Institute of Sustainable Humanosphere (RISH) in Uji, Kyoto, and MU Observatory of Kyoto university in Shigaraki, Shiga, during four years since September 2002. These directions and velocities are shown to agree well with those manually obtained from the motion of rain fronts in the weather charts published by the Meteorological Agency. A numerical estimate of the effects of satellite diversity techniques indicates that between two locations among the three observation points (OECU, RISH, MU) separated by 20-50km, the joint cumulative time percentages of rain attenuation become lower as the two locations are aligned perpendicular to the rain front, in other words, along with the directions of the motion of rain areas. © 2007 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Rain

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Design and implementation of highway distress and preventive measures decision support system based on WebGIS

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重庆邮电大学学报（自然科学版） 2007年第3期19卷 304-308页

作者： ZHANG Pu TAO Li-Na XIA Ying Dong-wook Lee Hae-young Bae School of Computer Science and Technology Chongqing University of Posts and Telecommunications Chongqing 400065 P. R. China Highway Engineering Department of Chongqing Communications Research and Design Institute Chongqing 400067P. R. China Dept. of Computer Science ＆ Information Engineering Inha UniversityIncheon 402-751 Korea

A highway distress and preventive measures decision support system based on WebGIS and J2EE architecture were studied, and the key issues for the system are presented. Such issues as spatial data and attribute data organization, technology of enhancing user experience, database connection pool were investigated. The feasibility of the theories and methods were tested through the system.

关键词：地理信息系统设计公路病害预防措施决策支持系统

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Dynamic Bandwidth assignment for Multi-service access in long-reach GPON

Dynamic Bandwidth assignment for Multi-service access in lon...

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33rd European Conference and Exhibition of Optical Communication

作者： C.-H. Chang N. M. Alvarez P. Kourtessis J. M. Senior Optical Networks Group Science and Technology Research Institute (STRI) University of Hertfordshire Hatfield AL10 9AB UK Dept. Of Signal Theory Communications and Telematic Engineering University of Valladolid Camino del Cementerio s/n 47011 Valladolid Spain

A novel, two-state bandwidth assignment MAC protocol is demonstrated to assign network resources in long-reach GPONs. Network modelling has displayed significant improvement in packet loss-rate and channel throughput ... 详细信息

关键词： Bandwidth Optical network units Digital multimedia broadcasting Delay Protocols Throughput Heuristic algorithms

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Rain attenuation characteristics of up and down link radio waves of Ku-band satellite communications observed in Japan and Indonesia

Rain attenuation characteristics of up and down link radio w...

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Progress in Electromagnetics Research Symposium 2006, PIERS 2006 Tokyo

作者： Maekawa, Yasuyuki Tsujino, Shinichi Shibagaki, Yoshiaki Sato, Toru Yamamoto, Mamoru Hashiguchi, Hiroyuki Fukao, Shoichiro Dept. of Telecommuncations and Computer Networks Osaka Electro-Communication University Japan Dept. of Communications and Computer Engineering Kyoto University Japan Research Institute for Sustainable Humanosphere Kyoto University Japan

ISBN: (纸本)9781629939513

Rain attenuation characteristics of up- and down-link radio waves of Ku-band satellite communications in both Japan and Indonesia are presented for the past three years of 2003-2005, using Japan fs domestic communication satellite Superbird C (14°4 E in orbit) that connects Research Institute for Sustainable Humanosphere of Kyoto university (RISH) to Equatorial Atmosphere Radar Observatory (EAR;0.2° S, 100.3° E). The yearly cumulative time percentages of the observed rain attenuation are in good agreement with the ITU-R (International Telecommunication Union. Radiocommunication Sector) predictions for both locations in Japan and Indonesia. At EAR in Indonesia, however, the time percentages of both up- and down-link attenuation become much smaller than the ITU-R predictions in the range of larger than 10 dB. This indicates the reduction of equivalent path length down to about 2 km, as also revealed by the X-band radar observations along the same propagating path. This equivalent path length seems rather short compared with those obtained in other tropical observation sites, being attributed to unique features of the EAR site that is located in a highland basin and has a comparatively low elevation angle of 39°even in the tropics.

关键词： Radio waves

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