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VARIABLE-RATE MULTIUSER DIVERSITY IN CORRELATED MIMO channel VIA virtual channel REPRESENTATION

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Journal of Electronics(China) 2006年第3期23卷 332-337页

作者： Tang Lan You Xiaohu Liang Yingchang National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China Institute for Information Research Singapore 119613 Singapore

This paper studies the multiuser diversity with constellation selection based on a virtual representation of realistic Multiple Input Multiple Output （MIMO） correlated channels. To realize multiuser diversity in slow fading channels, random beamforming is adopted. Random beamforming matrix exploiting virtual channel representation is constructed, which can match the channel matrix of the desired user better. Sirnultaneously, adaptive coded modulation is applied to each sub-channel of the selected user to improve the system performance further.

关键词： Multiple Input Multiple Output (MIMO) Correlated channel virtual channel Beamforming Multiuser diversity Adaptive modulation

Fault-Tolerant Wormhole Routing with 2 virtual channels in Meshes

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Journal of Computer Science & Technology 2005年第6期20卷 822-830页

作者：周继鹏 Department of Computer Science Jinan University Guangzhou 510632 P.R. China

In wormhole meshes, a reliable routing is supposed to be deadlock-free and fault-tolerant. Many routing algorithms are able to tolerate a large number of faults enclosed by rectangular blocks or special convex, none of them, however, is capable of handling two convex fault regions with distance two by using only two virtual networks. In this paper, a fault-tolerant wormhole routing algorithm is presented to tolerate the disjointed convex faulty regions with distance two or no less, which do not contain any nonfaulty nodes and do not prohibit any routing as long as nodes outside faulty regions are connected in the mesh network. The processors＇ overlapping along the boundaries of different fault regions is allowed. The proposed algorithm, which routes the messages by X-Y routing algorithm in fault-free region, can tolerate convex fault-connected regions with only two virtual channels per physical channel, and is deadlock- and livelock-free. The proposed algorithm can be easily extended to adaptive routing.

关键词： disjoint fault-connected region deadlock freedom fault-tolerant wormhole routing virtual channel

A general communication performance evaluation model based on routing path decomposition

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第7期12卷 561-573页

作者： Ai-lian CHENG 1,Yun PAN 1,2,Xiao-lang YAN 2,Ruo-hong HUAN 3 (1 Department of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China) (2 Institute of VLSI Design,Zhejiang University,Hangzhou 310027,China) (3 College of Computer Science and Technology,Zhejiang University of Technology,Hangzhou 310023,China) Department of Information Science and Electronic Engineering Zhejiang University Hangzhou China Institute of VLSI Design Zhejiang University Hangzhou China College of Computer Science and Technology Zhejiang University of Technology Hangzhou China

The network-on-chip (NoC) architecture is a main factor affecting the system performance of complicated multi-processor systems-on-chips (MPSoCs).To evaluate the effects of the NoC architectures on communication efficiency,several kinds of techniques have been developed,including various simulators and analytical *** simulators are accurate but time consuming,especially in large space explorations of diverse network configurations;in contrast,the analytical models are fast and flexible,providing alternative methods for performance *** this paper,we propose a general analytical model to esti-mate the communication performance for arbitrary NoCs with wormhole routing and virtual channel flow *** resolve the inherent dependency of successive links occupied by one packet in wormhole routing,we propose the routing path decomposition approach to generating a series of ordered link *** we use the traditional queuing system to derive the fine-grained transmission latency for each network *** to our experiments,the proposed analytical model provides a good approximation of the average packet latency to the simulation results,and estimates the network throughput precisely under various NoC configurations and ***,the analytical model runs about 10 5 times faster than the cycle-accurate NoC *** applications of the model including bottleneck detection and virtual channel allocation are also presented.

关键词： Analytical model Communication performance Network-on-chip (NoC) Queuing system Routing path decom-position virtual channel

Network Based Real Time Condition Monitoring of Rotating Machinery

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International Journal of Plant Engineering and Management 2003年第1期8卷 22-27页

作者： ZHAO Chong chong, LIAO Ming fu, YU Xiao Institute of Monitoring and Control for Rotating Machinery and Windturbines (NPU & TU Berlin), Northwestern Polytechnical University (NPU), Xi’an 710072, P.R.China Institute of Monitoring and Control for Rotating Machinery and Windturbines (NPU & TU Berlin) Northwestern Polytechnical University (NPU)Xi'an 710072 P.R.China

This paper presents the development of a network based real time condition monitoring system of rotating machinery. The system is built up in a double net structure consisting of local net (including client and server) and intranet. The client serves as a field data collector and processor that samples the vibration signals and process parameters of a machine monitored in the net and processes the sampled data. The data collected by the client are transmitted to the server that processes the data further and provides the results of the diagnosis of each machine to any distant terminals through intranet or internet. Such a structure of the monitoring system is advantageous in safety, reliability and reasonably shares the existing net resources. In order to ensure real time transmission of the data, two procedures of data transmission, virtual channel and data pool, are developed and applied in the monitoring system. The experimental results show that the monitoring system works well and is suitable to monitor a large group of rotating machines.

关键词： Network based monitoring system rotating machinery virtual channel data pool