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International Conference on Reconfigurable Computing and FPGAs (ReConFig)

作者： Juan-Carlos Diaz-Martin Carolina Gómez-Tostón Gutiérrez Álvaro Cortés Fácila Juan-Antonio Rico-Gallego Dept. of Computer Technology and Communications University of Extremadura Cáceres Spain Dept. of Computing and Telematic Systems Engineering University of Extremadura Cáceres Spain

MPI is the traditional paradigm to parallelize applications for High Performance Computing environments. AzequiaMPI is an implementation of the MPI-1.3 standard. Its thread-based architecture enables it to run on high-end HPC machines as well as on embedded environments as soft-core processor in FPGAs. This article describes the experience of building a maintainable cluster of fourteen popular Xilinx XUP2-Pro FPGA development boards around the PetaLinux/Micro blaze base. Figures on the AzequiaMPI performance are given.

关键词： Field programmable gate arrays Servers IP networks Multicore processing Ethernet networks Bandwidth Protocols

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Quasi multi-mode resonator for wideband filter applications

Quasi multi-mode resonator for wideband filter applications

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作者： Nosrati, Mehdi Virdee, Bal Mirzaee, Milad Dept. of Electrical and Computer Engineering Islamic Azad University Dehloran Ilam Iran Faculty of Computing Centre for Communications Technology London Metropolitan University 188-226 Holloway Road London N7 8DB United Kingdom Dept. of Electrical and Electronics Engineering Islamic Azad University Eslam Abad Kermanshah Iran

ISBN: (纸本)9784902339222

This paper presents a compact planar bandpass filter that comprises of multiple coupled-line sections to exhibit a wideband elliptic function response. The equivalent circuit representing the proposed resonator structure was synthesized using a conventional coupled-line J-inverter model. The electrical length of the transmission-line connecting the two inverters is λ/6, thus effectively reducing its physical size compared to existing designs. The proposed filter structure using triple coupled quasi multi-mode resonators provides a frequency response with a wide 3-dB fractional bandwidth of 50%, and the two transmission zeros at the upper and lower stop-bands provide a highly sharp cut-off response with a low passband insertion-loss and good return-loss characteristics. © 2010 IEICE Institute of Electronics Informati.

关键词： Bandpass filters

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Wideband DOA estimation using two sensors

Wideband DOA estimation using two sensors

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA 2010

作者： Gu, Jian-Feng Li, Nan-Jun Wei, Ping Tai, Heng-Ming Department of Electronic Engineering University of Electronic Science and Technology of China Chengdu Sichuan 610054 China Centre for Signal Processing and Communications Dept. of Electrical and Computer Engineering Concordia University Montreal QC H3G 1M8 Canada Department of Electrical Engineering University of Tulsa Tulsa OK 74104 United States

ISBN: (纸本)9780769539621

This paper proposes an efficient direction-of-arrival (DOA) estimation algorithm for wideband signals from data collected using two sensors. Like the traditional wideband methods, this algorithm first decomposes wideband sources into narrowband bins. At each frequency bin, the cross-correlation between sensors is estimated to construct a Toeplitz matrix, which contains all angle information. Thus the physical size between two sensors is independent of the frequency bins and relies more on the inter-frequency bin difference. The proposed method is flexible in the design of the sensor array without inducing ambiguities. Simulation results confirm the ability of the proposed method that provides reliable estimates in multiple wideband signal environments. © 2010 IEEE.

关键词： Array processing

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An FPGA implementation of real-time retinex video image enhancement

An FPGA implementation of real-time retinex video image enha...

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作者： Tsutsui, Hiroshi Nakamura, Hideyuki Hashimoto, Ryoji Okuhata, Hiroyuki Onoye, Takao Dept. of Communications and Computer Engineering Graduate School of Informatics Kyoto University Yoshida Honmachi Sakyo Kyoto 606-8501 Japan Dept. of Information Systems Engineering Graduate School of Information Science and Technology Osaka University 1-5 Yamadaoka Suita Osaka 565-0871 Japan Synthesis Corporation Awajimachi TC Bldg. Awajimachi 2-6-9 Chuo-ku Osaka 541-0047 Japan

ISBN: (纸本)9781424496730

In this paper, we present an FPGA implementation of real-time Retinex video image enhancement. Our implementation is based on the previously proposed architecture, which can handle the variational approach of the Retinex theory. In order to efficiently reduce the enormous computational cost required for image enhancement, processing layers and repeat counts of iterations are determined in accordance with software evaluation result. As for processing architecture, our pipelining architecture can handle high resolution pictures in real-time. Our FPGA implementation supports WUXGA (1,920x1,200) 60 fps as well as 1080p60. © 2010 TSI Press.

关键词： Image enhancement

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Thermal analysis experiences of a tri-core SoC system

Thermal analysis experiences of a tri-core SoC system

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International Conference on Green Circuits and Systems (ICGCS)

作者： Chiao-Ling Lung Yi-Lun Ho Shih-Hsiu Huang Chen-Wei Hsu Jia-Lu Liao Si-Yu Huang Shih-Chieh Chang Information and Communications Lab Industrial Technology Research Institute HsinChu Taiwan Dept. of Computer Science National Tsing Hua University HsinChu Taiwan Dept. of Electrical Engineering National Tsing Hua University HsinChu Taiwan

Higher temperature induced by higher power density results in higher cost, lower performance and lower reliability. The thermal effects become important issues of today's VLSI design. In this paper, we adopt a RC-based thermal model to perform the steady-state and transient thermal analysis for a tri-core SoC system. The power information is generated from the ESL power estimation. The results show that the lateral heat dissipation cannot be ignored since hot spots occur in the vicinity where the nearby blocks with high power density, but none of hot spots with the highest power density. Finally, we also compare our fast RC based thermal analysis model with commercial CFD (Computational Fluid Dynamics) software whose runtime is extremely slow. The results show the high degree of consistency.

关键词： Transient analysis Computational fluid dynamics Temperature Costs Power system reliability Very large scale integration Power system modeling Steady-state Performance analysis Power generation

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The multiple prioritized access mechanism of Cognitive networks

The multiple prioritized access mechanism of Cognitive Netwo...

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IET 3rd International Conference on Wireless, Mobile and Multimedia networks (ICWMNN 2010)

作者： Xiaoli Liu Shaohai Hu Yang Xiao Yanchang Liu Guangzhi Qu Kiseon Kim Institute of Information Science Beijing Jiaotong University China Dept. of Engineering and Computer Science Oakland University Rochester MI48309 USA Dept. of Information and Communications Gwangju Institute of Science and Technology 500-712 Korea

Developments of wireless communication technology need higher standards of reliability of network and full utilization of resources. The proposition of Cognitive Network improves the utilization of frequency spectrum effectively. Main tasks of this paper are to introduce EDCA mechanism into the Cognitive networks and validate if it can guarantee the classified service access effectively. First of all, we develop an access control for the Cognitive networks, which adapts the EDCA mechanism of WLAN and sets different priorities for Cognitive users. Secondary, we propose a new prioritized access control algorithm for Cognitive Network, which adapts Linear Backoff Algorithm, Stall Avoidance Scheme etc. to enhance the performance. Finally, we use and extend NS2 to satisfy the Multi-priority access with multi-interface and multi-channel. Primary User and Cognitive Users connect to the same node, which satisfies multi-interface and multi-channel. We can reach the conclusion that the performance of Cognitive Network used mechanism of EDCA is better than that of used mechanism of DCF. The spectrum utilization of Cognitive Network is higher than that of Non-cognitive Network. Primary Users would not be interfered by Cognitive User.

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A cognitive spatial multiplexing scheme for MIMO-CDMA networks

A cognitive spatial multiplexing scheme for MIMO-CDMA networ...

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IET 3rd International Conference on Wireless, Mobile and Multimedia networks (ICWMNN 2010)

作者： Yang Xiao Kiseon Kim Guangzhi Qu Institute of Information Science Beijing Jiaotong University 100044 China Dept. of Information and Communications Gwangju Institute of Science and Technology 500-712 Korea Dept. of Engineering and Computer Science Oakland University Rochester MI48309 USA

The existing cognitive schemes have not considered cognitive spatial multiplexing (CSM) for MIMO-CDMA network, there are three vital problems to hinder CSM's application: spatial channels' estimation for mobile stations(MSs), space-time coding and decoding for base station (BS) and MSs, the implementation complexity of BS and MSs. To solve the problems, a simplified cognitive spatial multiplexing scheme is proposed, including BS and MS systems, where MIMO BS in a cell has two antennas and each MS of lower moving speed has one antenna only. To ensure communication quality of the network, the scheme applies LDPC as the channel coding instead of space-time coding for BSs and MSs. BS assigns the same CDMA channels for MSs to have larger space interval. Simulations show that good spatial multiplexing capacity and BER performance have been achieved by the proposed scheme.

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Prototyping platform for performance evaluation of SHA-3 candidates

Prototyping platform for performance evaluation of SHA-3 can...

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2010 IEEE International Symposium on Hardware-Oriented Security and Trust, HOST 2010

作者： Kobayashi, Kazuyuki Ikegami, Jun Kneževíc, Miroslav Guo, Eric Xu Matsuo, Shin'ichiro Huang, Sinan Nazhandali, Leyla Kocabaş, Ünal Fan, Junfeng Satoh, Akashi Verbauwhede, Ingrid Sakiyama, Kazuo Ohta, Kazuo University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan Katholieke Universiteit Leuven Kasteelpark Arenberg 10 B-3001 Leuven-Heverlee Belgium Electrical and Computer Engineering Dept. Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States National Institute of Information and Communications Technology 4-2-1 Nukui-Kitamachi Koganei Tokyo 184-8795 Japan Research Center for Information Security National Institute of Advanced Industrial Science and Technology 1-18-13 Sotokanda Chiyoda Tokyo 101-0021 Japan

ISBN: (纸本)9781424478101

The objective of the SHA-3 NIST competition is to select, from multiple competing candidates, a standard algorithm for cryptographic hashing. The selected winner must have adequate cryptographic properties and good implementation characteristics over a wide range of target platforms, including both software and hardware. Performance evaluation in hardware is particularly challenging because of the large design space, wide range of target technologies, and multitude of optimization criteria. We describe the efforts of three research groups to evaluate SHA-3 candidates using a common prototyping platform. Using a SASEBO-GII FPGA board as a starting point, we evaluate the performance of the 14 remaining SHA-3 candidates with respect to area, throughput, and power consumption. Our approach defines a standard testing harness for SHA-3 candidates, including the interface specifications for the SHA-3 module on the SASEBO testing board. ©2010 IEEE.

关键词： Hash functions

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A generalized temporal and spatial role-based access control model

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Journal of networks 2010年第8期5卷 912-920页

作者： Chen, Hsing-Chung Wang, Shiuh-Jeng Wen, Jyh-Horng Huang, Yung-Fa Chen, Chung-Wei Department of Computer Science and Engineering Asia University IEEE Member Taichung County 41354 Taiwan National Central Police University Depart. of Information Management Taoyuan Taiwan Thonghai University Depart. of Electrical Engineering Taichung County Taiwan Chaoyang University of Technology Dept. of Information and Communication Engineering Taichung County Taiwan National Tsing Hua University Institute of Communications Engineering Hsinchu Taiwan

Securing access to data, applied to mobile service applications with temporal and spatial controlling, requires constructing innovative definitions with temporal and spatial limitations for an access-control system. To cope with the temporal and spatial requirements, we propose a generalized Temporal and Spatial RBAC (TSRBAC) model. In the TSRBAC model, temporal-period and spatial-location based entities are used to constrain the permissions of objects, user positions, and geographically bounded roles. Furthermore, we also present temporal and spatial relations of Temporal and Spatial Separation of Duties (TSSSD), Temporal and Spatial Dynamic Separation of Duties (TSDSD) constraints in the TSRBAC model. © 2010 Academy Publisher.

关键词： Access control models

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On the diversity, multiplexing, and array gain tradeoff in MIMO channels

On the diversity, multiplexing, and array gain tradeoff in M...

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IEEE International Symposium on Information Theory

作者： Luis G. Ordóñez Daniel P. Palomar Javier R. Fonollosa Signal Processing and Communications Group Universitat Politècnica de Catalunya - Barcelona Tech Barcelona Spain Dept. of Electric and Computer Engineering Hong Kong University of Science and Technology (HKUST) Hong Kong Hong Kong China

Following the seminal work of Zheng and Tse on the diversity and multiplexing tradeoff (DMT) of MIMO channels, in this paper we introduce the array gain to further investigate the fundamental relation between transmission rate and reliability in MIMO systems. The array gain gives information on the power offset that results from exploiting channel state information at the transmitter or, simply, because of the channel model. Hence, the diversity, multiplexing, and array gain (DMA) tradeoff is able to cope with the limitations of the original DMT and provide with operational meaning in the sense that the DMA tradeoff of a particular system can be directly translated into a parameterized characterization of its associated outage probability performance. As a first step towards this objective, we present in this paper the fundamental DMA tradeoff achievable by any scheme in uncorrelated Rayleigh block-fading MIMO channels.

关键词： MIMO Diversity reception OFDM modulation Fading Channel state information Transmitters Receiving antennas Antenna arrays Diversity methods Array signal processing

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