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检索条件"机构=Department of Computer and Communication System Engineering"

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A study of antenna array based multipath propagation phenomenon in LAS-CDMA standard

A study of antenna array based multipath propagation phenome...

引用

2004 RF and Microwave Conference, RFM 2004

作者： Ng, Chee Kyun Khatun, Sabira Ali, Borhanuddin Mohd Jamuar, Sudhanshu Shekhar Ismail, Mahamod Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering Universiti Kebangsaan Malaysia Malaysia

ISBN: (纸本)078038671X

Throughout the history of wireless communications, spatially diversity's antenna array system has being important in improving the radio link between wireless users. Moreover, this system are proposed to reduce the multipath fading through its directivity narrowly radiation beam. The introduction of interference free window in delay domain from newly LAS-CDMA standard has received many attentions for furthering research on multipath delay spread. In this paper, we studied the effect of angular spread on maximum excess delay in multipath propagation environments. Then, we examined the application of antenna array in LAS-CDMA standard to overcome this multipath phenomenon. First of all, the multipath propagation literatures are reviewed, followed by the explanation of maximum angular spread in a simple discrete ring of scatterers model. Comparison analyses are made between conventional omnidirectional antenna and narrow beam antenna array. Finally, the analytical performances in term of power delay profile are presented. © 2004 IEEE.

关键词： Code division multiple access

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Smart antenna system with orthogonal codes

Smart antenna system with orthogonal codes

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Proceedings of the IEEE 6th Circuits and systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless communication

作者： Ng, Chee Kyun Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering Universiti Kebangsaan Malaysia Malaysia

ISBN: (纸本)0780379381

Smart antenna, which improves the performance of wireless systems, suppress all interfering signals, and increase the system capacity. The objective of this paper is to provide an analysis of system capacity when using smart antenna with the orthogonal code. A new technique which use orthogonal codes in multiple beams to distinguish multi-user is introduced. The properties of LinkAir communications' large area synchronous (LAS) or smart codes, which are claimed to be fully orthogonal code and are used to combat major interferences, are studied. The effect of spatial multiple beams in an area where density of users is very condense in a cell is also examined. Finally, the system performance in term of system capacity is presented.

关键词： Mobile telecommunication systems

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Photorefractive bi-directional connection module with mutual-pumped phase conjugate mirror

Photorefractive bi-directional connection module with mutual...

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Photonics Asia 2004:Information Processing and Data Storage

作者： Kazumasa Kori Atsushi Okamoto Yoshihisa Takayama Masatoshi Bunsen Hisatoshi Funakoshi Terumasa Ito Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Wireless Communications Department National Institute of Information and Communications Technology Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University

The purpose of this study is to apply a free-space optical interconnection to a reconfigurable board-to-board connection where the wiring patterns connecting boards are optically formed without electr

关键词： Photorefractive effect, Free-space optical interconnection, Mutually pumped phase conjugate mirror

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Experiment on all-optical bi-directional interconnection with double mutual-pumped phase conjugate mirrors

Experiment on all-optical bi-directional interconnection wit...

引用

Photonics Asia 2004;Optoelectronics,Microelectronics,and Nanotech

作者： Soichiro Hondo Atsushi Okamoto Kunihiro Sato Satoshi Honmac Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Faculty of Engineering Hokkai-Gakuen University Department of Electronic Engineering Graduate School of Engineering Yamanashi University

Recently, the scheme of bi-directional optical communication with a mutual-pumped phase conjugate mirror (MPPCM) has attracted attention. Bi-directional communication enables the integration of device

关键词： phtorefractive effect, phase conjugation, all-optical interconnection

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Observation and application of laser induced shock wave

Observation and application of laser induced shock wave

引用

International Conference on Advanced Information Networking and Applications (AINA)

作者： H. Nose H. Maeda M. Nakahara Intelligent Information System Engineering Graduate School of Engineering Fukuoka Institute of Technology Japan Department of Communication and Computer Engineering Fukuoka Institute of Technology Japan

A high pressure pulse is produced from optical fiber output surface by pulse laser. We found that enhancement of absorption of laser energy takes place at the output surface, if the surface is intentionally roughened. The effect causes the pressure enhancement of the generated shock wave in water. We also found high pressure shock propagation in water from the fiber that output surface was roughened and rounded intentionally. It gives further strengthening of the shock wave generation. These phenomena can be used as a controllable pressure pulse source for microsurgery in medicine. The phenomena have been observed by the pulse laser shadowgraphy. The shock wave propagation characteristics are found to depend upon various parameters such as the fiber diameter, the fiber material, the surface roughness, the surrounding medium, the laser energy, etc. As an example of its application, the experiment to cut gelatin by the shock wave was made. The cross section of gelatin is intensively dependent on pulse duration time width of laser. Also, application as a source for acousto-optic modulator and its advantage are mentioned.

关键词： Laser applications Shock waves Fiber lasers Optical surface waves Rough surfaces Surface roughness Optical pulses Optical fibers Surface emitting lasers Laser beam cutting

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Hybrid error concealment in digital compressed video streams

Hybrid error concealment in digital compressed video streams

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International Conference on Information Technology: Research and Education (ITRE)

作者： O. Hadar M. Hube R. Huber Communication System Engineering Department Ben-Gurion University of the Negev Beer-Sheva Israel Electrical and Computer Engineering Department Ben-Gurion University of the Negev Beer-Sheva Israel

Transmission of a compressed video signal over a lossy communication network exposes the information to losses and errors, which may cause serious and visible degradation to the decoded video stream. We present a new hybrid error concealment algorithm, relying on temporal and spatial concealment. This algorithm includes consideration of the spatial and temporal activity in the surrounding of a lost block, and introduces four thresholds, which lead to choosing the suitable concealment scheme for each block.

关键词： Video compression Streaming media Propagation losses Degradation Transform coding Application software Buffer storage Image reconstruction Intelligent networks systems engineering and theory

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Effects of frame rate, frame size and MPEG2 compression on the perceived compressed video quality transmitted over lossy IP networks

Effects of frame rate, frame size and MPEG2 compression on t...

引用

International Conference on Information Technology: Research and Education (ITRE)

作者： R. Shmueli R. Huber O. Hadar Electrical and Computer Engineering Department Ben-Gurion University of the Negev Beer-Sheva Israel Communication System Engineering Ben-Gurion University of the Negev Beer-Sheva Israel

The purpose of this paper is to analyze the relationship between viewer-perceived quality and encoding schemes. The encoding schemes depend on transmission bit-rate, on MPEG compression depth, on frame size and on frame rate in a constant bit-rate (CBR) video transmission of a MPEG2 video sequence. The compressed video sequence is transmitted over a lossy communication network with quality of service (QoS) and a certain IP loss model. On the end-user side, viewer-perceived quality depends on changes in the network conditions and on video complexity. We demonstrate that, when jointly considering the impact of coding bit rate, packet loss and video complexity, there is an optimal encoding scheme, which depends on the video content. This optimal encoding scheme maximizes the viewer-perceived quality.

关键词： Transform coding Video compression Propagation losses Quality of service IP networks Encoding Video sequences Bit rate Streaming media Bandwidth

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Smart antenna system with orthogonal codes

Smart antenna system with orthogonal codes

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Proceedings of the IEEE Circuits and systems Symposium on Emerging Technologies

作者： C.K. Ng B.M. Ali S.S. Jamuar M. Ismail Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering Universiti Kebangsaan Malaysia Malaysia

Smart antenna, which improves the performance of wireless systems, suppress all interfering signals, and increase the system capacity. The objective of this paper is to provide an analysis of system capacity when using smart antenna with the orthogonal code. A new technique, which uses orthogonal codes in multiple beams to distinguish multiuser is introduced. The properties of linkair communications' large area synchronous (LAS) or smart codes, which are claimed to be fully orthogonal code and are used to combat major interferences, are studied. The effect of spatial multiple beams in an area where density of users is very condense in a cell is also examined. Finally, the system performance in term of system capacity is presented.

关键词： Multiaccess communication Interference Time division multiple access Frequency division multiaccess Bandwidth systems engineering and theory system performance GSM Fading Bit error rate

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Hardware realization of a bio-inspired POEtic tissue

Hardware realization of a bio-inspired POEtic tissue

引用

NASA/DoD Workshop on Evolvable Hardware

作者： J. Manuel Moreno Y. Thoma E. Sanchez O. Torres G. Tempesti Department of Electronic Engineering Technical University Catalunya Barcelona Spain School of Computer and Communication Sciences Logic System Laboratory Swiss Federal Institute of Technology Lausanne Switzerland

This paper presents the physical hardware realization of a novel bio-inspired architecture, called POEtic tissue. This electronic tissue provides a platform for the efficient implementation in actual hardware of evolutionary, epigenetic (learning) and ontogenetic (growth, self-repair, self-replication) mechanisms. After a brief introduction the overall organization of the tissue is presented. Then its main building blocks is reviewed. Finally, the implementation details of the first hardware prototype of the tissue, constructed in the form of an ASIC, is outlined. The implementation results demonstrate that the proposed architecture constitutes a good candidate when considering the electronic realization of bio-inspired principles.

关键词： Hardware Evolution (biology) computer network management Genetics Biological systems computer networks Logic Laboratories Technology planning Navigation

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H/sub /spl infin// controller order reduction due to stable invariant zeros and its application to a magnetic suspension system

H/sub /spl infin// controller order reduction due to stable ...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： Xin Xin M. Kaneda S. Hara Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama prefectural University Soja Okayama Japan Department of Information Physics and Computing Graduate School of Information Science and Technology University of Tokyo Bunkyo Tokyo Japan

This paper studies the H/sub /spl infin// controller order reduction due to the stable invariant zeros and its application to a magnetic suspension system. First, we explore the H/sub /spl infin// controller order reduction due to the stable complex invariant zeros to address how we can go beyond the known results for the order reduction due to the unstable or real stable invariant zeros. We propose sufficient conditions for the existence of the reduced-order H/sub /spl infin// controllers due to the stable complex invariant zeros. If the proposed sufficient conditions are satisfied, we present two LMI based procedures to compute the reduced order H/sub /spl infin// controllers. Second, we address the application of these theoretical results to a mixed sensitivity problem for a magnetic suspension system with a flexible beam. The numerical computations of the reduced-order controllers and the comparison with the full-order controllers are reported. The numerical investigation carried out validates the proposed theoretical results.

关键词： Control systems Magnetic levitation Sufficient conditions Design methodology communication system control Transfer functions Error correction systems engineering and theory Physics Information science

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