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WRI International Conference on Communications and Mobile Computing, CMC

作者： Quan Zhou Xiaowei Li Yongjun Xu Institute of Computing Technology Key Laboratory of Computer System and Architecture Chinese Academy and Sciences Beijing China Institute of Computing Technology Laboratory of Sensor Networks Chinese Academy and Sciences Beijing China

Mean shift is a nonparametric method to estimate the density gradient, which iteratively computes the mean of observations and shifts to the centroid until reach a predefined end condition. This paper proposes a mean shift based scheme for localization and tracking in wireless sensor *** shift is a generalized framework, and range-free centroid and range-based W-Centrod are both the special cases of this generalized framework. A dynamically clustering protocol is proposed to support the generalized framework. Analysis and simulation results show that the communication overhead and jitter are reduced to 1/3 of traditional algorithms. The positioning accuracy of proposed algorithm with optimal weight increases 28% and 11% in comparison to Centroid and W-Centroid.

关键词： Wireless sensor networks computer networks Clustering algorithms Laboratories Protocols Equations Mobile communication Mobile computing International collaboration computer architecture

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Smallest Enclosing Circle Based Localization Approach for Wireless Sensor Networks

Smallest Enclosing Circle Based Localization Approach for Wi...

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WRI International Conference on Communications and Mobile Computing, CMC

作者： Quan Zhou Xiaowei Li Yongjun Xu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Laboratory of Sensor Networks Institute of Computing Technology Chinese Academy and Sciences Beijing China

A novel range-free localization approach, smallest enclosing Circle based Localization (SECL), has been proposed. This approach uses the center of smallest enclosing circle of neighboring anchor nodes to estimate the position of target. Comparing to centroid, SECL considers the geometrical coverage of anchors rather than the mass center of them. Consequently, SECL is robust to imperfect topology, especially when the topology of anchors is depolyed unevenly. Simulation results show that SECL outperforms Centroid by an average of 10%, and even better when the topology is not uniform.

关键词： Wireless sensor networks Network topology computer networks Laboratories Robustness Computational modeling Equations Hardware Mobile communication Mobile computing

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Implementation of rate matching with low latency and little memory for LTE turbo code

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Journal of Information and Computational Science 2013年第13期10卷 4117-4125页

作者： He, Suqin Hu, Qiaozhi Zhang, Haijun Department of Computer Science and Technology Beijing University of Chemical Technology Beijing 100029 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

In LTE (Long Term Evolution), the high utilization for physical resources is achieved by scheduling suitable number of time frequency resource elements for one user in one subframe. This is supported by the rate matching module that selecting arbitrary number of bits from the turbo coding bit streams. In this paper, a closed-form rate matching implementation method is proposed. It derives an integrated expression which is normalized for the 3 turbo coding streams. This expression sets up a mapping relationship between the bit streams input to and the bit sequence output from rate matching module. Moreover, the expression can be applied to rate de-matching processing in the receiver end. Compared with the existing method, the rate matching method that we proposed generates low latency and requires small memory. © 2013 Binary Information Press.

关键词： Turbo codes

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Performance Study of Relay Coordination Schemes for Two-Hop Networks: Two-Cell Case

Performance Study of Relay Coordination Schemes for Two-Hop ...

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IEEE International Conference on Communications

作者： Kasun T. Hemachandra Norman C. Beaulieu Department of Electrical and Computer Engineering University of Alberta School of Information and Communication Engineering and the Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781467364300

The outage probability of a two-hop coordinated decode-and-forward relay network is investigated. Relay coordination is performed only with the dominant interferer. Different levels of network coordination are studied and their performances are compared. Exact expressions are derived for the outage probability of a particular mobile user for each coordination scheme. Asymptotic outage probability is derived to identify the diversity and coding gains for each coordination scheme.

关键词： Cochannel interference Decode-and-forward Outage probability Relay coordination Zero-forcing

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An ultra-fast hybrid simulation framework for ASIP

An ultra-fast hybrid simulation framework for ASIP

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： Ji Qiu Xiang Gao Yifei Jiang Xu Xiao Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences (CAS) Beijing China Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL USA

ISS (Instruction Set Simulator) plays an important role in pre-silicon software development for ASIP. However, the speed of traditional simulation is too slow to effectively support full-scale software development. In this paper, we propose a hybrid simulation framework which further improves the previous simulation methods by aggressively utilizing the host machine resources. The utilization is achieved by categorizing instructions of ASIP application into two types, namely custom and basic instructions, via binary instrumentation. Then in a way of hybrid simulation, only custom instructions are simulated on the ISS and basic instructions are executed fast and natively on the host machine. We implement this framework for an industrial ASIP to validate our approach. Experimental results show that when the implemented ISS, namely GS-Sim, is applied to practical multimedia decoders, an average simulation speed up to 1058.5MIPS can be achieved, which is 34.7 times of the state-of-art dynamic binary translation simulator and is the fastest to the best of our knowledge.

关键词： Instruments Context Programming Decoding Switches Prototypes Context modeling

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Channel Width Utilization Improvement in Testing NoC-Based systems for Test Time Reduction

Channel Width Utilization Improvement in Testing NoC-Based S...

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IEEE International Workshop on Electronic Design, Test and Applications (DELTA)

作者： Jia Li Qiang Xu Yu Hu Xiaowei Li Key Laboratory of Computer System and Architecture ICT CAS Beijing China Department of Computer Science & Engineering Chinese University of Hong Kong Hong Kong China Chinese Academy and Sciences Beijing China

Testing NoC-based systems mainly relies on reusing the Network-on-Chip architecture as the test access mechanism (TAM). This, however, implies that the core's test wrapper is supplied with full NoC channel width even if there is a mismatch between the two. How to effectively and efficiently make better utilization of the NoC channels for test data transferring is therefore an interesting and challenging problem. In this paper, we propose to combine a new wrapper design with interleaved test scheduling. Compared to [8], the proposed method can achieve better NoC channel utilization for test without manipulating test frequencies, which not only reduces test power, but also saves design effort for the test engineers. Consequently, the testing time of the NoC-based system is considerably reduced with the proposed technique (especially under stringent power constraints), as shown in the experimental results on circuits crafted from ITC02 benchmarks.

关键词： system testing Network-on-a-chip Circuit testing system-on-a-chip Electronic equipment testing Frequency Logic testing Clocks Application software Content addressable storage

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Bug analysis and corresponding error models in real designs

Bug analysis and corresponding error models in real designs

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IEEE International High-Level Design Validation and Test Workshop

作者： Tao Lv Tong Xu Yang Zhao Huawei Li Xiaowei Li Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Microprocessor Center Department of Computer Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

This paper presents the item-missing error model. It stems from the analysis of real bugs that are collected in two market-oriented projects: (1) the AMBA interface of a general-purpose microprocessor IP core; (2) a wireless sensor network oriented embedded processor. The bugs are analyzed via code structure comparison, and it is found that item-missing errors merit attention. The test generation method for item-missing error model is proposed. Structural information obtained from this error model is helpful to reach a greater probability of bug detection than that in random-generation verification with only functional constraints. Finally, the proposed test method is applied in verification of our designs, and experimental results demonstrate the effectiveness of this method.

关键词： Error analysis computer bugs Microprocessors Circuit faults computer errors computer architecture Circuit testing Automatic test pattern generation Genetic mutations Laboratories

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A stochastic method for controlling the scaling parameters of Cauchy mutation in fast evolutionary programming

A stochastic method for controlling the scaling parameters o...

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Congress on Evolutionary Computation

作者： Yunji Chen Ke Tang Tianshi Chen Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Nature Inspired Computation and Applications Laboratory Department of Computer Science and Technology University of Science and Technology of China Hefei Anhui China

The fast evolutionary programming (FEP) introduced the Cauchy distribution into its mutation operator, thus the performances of EP were promoted significantly on a number of benchmark problems. However, the scaling parameter of the Cauchy mutation is invariable, which has become an obstacle for FEP to reach better performance. This paper proposes and analyzes a new stochastic method for controlling the variable scaling parameters of Cauchy mutation. This stochastic method collects information from a group of individuals randomly selected from the population. Empirical evidence validates our method to be very helpful in promoting the performance of FEP.

关键词： Stochastic processes Genetic mutations Genetic programming Laboratories Random variables Gaussian distribution Control systems Stochastic systems computer architecture computer applications

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Optimizing inter-domain communication

Optimizing inter-domain communication

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15th International Conference on Parallel and Distributed systems, ICPADS '09

作者： Zang, Hongyong Sun, Yuzhong Gu, Kuiyan Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Dongxin Geology Research Institute of Shengli Oilfield Sinopec Dongying Shandong 257094 China

ISBN: (纸本)9780769539003

Virtual machine technology has played an important role in data center. Distributed services deployed in multiple virtual machines, may reside on one physical machine. This situation requires an efficient inter-domain communication channel with transparency and security principles ensured. Although current inter-domain mechanism has gained a much better performance compared to traditional inter-domain path offered by hypervisor, shared data channel size limitation and additional copy are still two restrains against a higher performance efficiency. In this paper, we give an analysis on these limitations, overcome these shortcomings, and achieve a higher efficient inter-domain communication channel. By applying virtual address protection mechanism during channel bootstrap, we enlarge the maximum size of shared data channel. By pointing network packet structure to the buffer in the shared data channel, we avoid an extra data copy on the receiver VM side. In our evaluation using a number of standard benchmarks, we have reduced the latency by nearly 40%, increased the throughput by approximately 45% and cut down more than 3500 CPU cycles per packet. © 2009 IEEE.

关键词： Virtual machine

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A Tamper-resistance key Pre-distribution Scheme for Wireless Sensor Networks

A Tamper-resistance Key Pre-distribution Scheme for Wireless...

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International Conference on Grid and Cooperative Computing Workshops (GCCW)

作者： Lei Xie Hongsong Zhu Yongjun Xu Yuefei Zhu Institute of Information Engineering Information and Engineering University Zhengzhou China Advanced Test Technology Laboratory Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

Wireless sensor network (WSN), which is integrated with many technologies such as sensor, embedded computing, wireless communication and distributed information processing etc., is becoming an important branch of ubiquitous computing research. WSN is composed of a large number of distributed sensor nodes, so to ensure the sensor nodes dependable is essential to security of whole network. By introducing a lightweight tamper-resistance design based on security co-processor into sensor nodes, this paper loosens up the security assumptions of WSN, and redefines the objectives of WSN security. Based on such secure infrastructure, the paper also proposes a concise and effective key pre-distribution scheme, in which each node needs to send only one cluster key announcement message and cluster key net can be set up within neighborhood

关键词： Wireless sensor networks Pervasive computing Ubiquitous computing Information security computer networks computer architecture Sensor arrays Design engineering Laboratories Embedded computing

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