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IEEE Conference on Wireless Communications and Networking

作者： Hong Cai Tiejun Lv Hui Gao Anzhong Hu Yueming Lu Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications Beijing China Singapore University of Technology and Design Singapore

ISBN: (纸本)9781479930845

The key of time of arrival (TOA) estimation in ultra wideband (UWB) ranging is to detect the first path (FP). In this paper, we propose an optimized FP detector with the adaptive threshold in the absence of prior channel state information (CSI). In particular, the error information (EI) set is introduced to guide the threshold adjustment and determine the TOA estimate with a novel iterative algorithm. The EI set captures the characteristics of major errors regarding the inappropriate threshold. After the iterative process, the proposed scheme is shown to achieve the asymptotic optimal threshold without large number of repeated pulses. Therefore, the proposed scheme efficiently improves the TOA estimation accuracy as compare to the traditional schemes. Simulation results validate the effectiveness and superiority of the proposed scheme.

关键词： error analysis iterative methods time-of-arrival estimation ultra wideband technology wireless channels CSI EI set TOA estimation UWB ranging adaptive threshold asymptotic optimal threshold channel state information error characteristic error information iterative process algorithm optimized FP detector optimized first path detector threshold adjustment time of arrival estimation ultrawideband ranging

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Generalized likelihood ratio test multiple-symbol detection for MIMO-UWB: A semidefinite relaxation approach

Generalized likelihood ratio test multiple-symbol detection ...

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IEEE Conference on Wireless Communications and Networking

作者： Chanfei Wang Tiejun Lv Hui Gao Anzhong Hu Yueming Lu Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications Beijing China Singapore University of Technology and Design Singapore

ISBN: (纸本)9781479930845

In this paper, semidefinite relaxation (SDR) technology is exploited for the multiple-symbol detection (MSD) over the multiple-input multiple-output (MIMO) ultra-wideband (UWB) systems. The existing scheme generalized likelihood ratio test (GLRT) MSD jointly detect multiple symbols, however, it entails a complexity of O(2 M ), where M is the observation window size. To this end, SDR is employed to reformulate the GLRT detection into a semidefinite programming (SDP) model, and two detectors, randomization-SDR (RSDR) and eigenvector-SDR (ESDR) are proposed on the order of O(M 3.5 ) and O(M 3 ), respectively. Complexity analysis validates that the SDR-MSD strategy is desirable owing to its reduced complexity, compared with the exponential-complexity sphere decoding (SD) MSD. Furthermore, Monte-Carlo simulations demonstrate that the proposed SDR detectors provide the bit error rate (BER) performance almost the same with that of the SD method, and the RSDR outperforms the ESDR at the price of slightly higher complexity.

关键词： Complexity theory Detectors Bit error rate Transmitting antennas Matrix converters Receiving antennas Optimization

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Patra: Parallel tree-reweighted message passing architecture

Patra: Parallel tree-reweighted message passing architecture

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International Conference on Field Programmable Logic and Applications

作者： Wenlai Zhao Haohuan Fu Guangwen Yang Wayne Luk Ministry of Education Key Laboratory for Earth System Modeling Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Computing Imperial College London

Maximum a posteriori probability inference algorithms for Markov Random Field are widely used in many applications, such as computer vision and machine learning. Sequential tree-reweighted message passing (TRW-S) is an inference algorithm which shows good quality in finding optimal solutions. However, the performance of TRW-S in software cannot meet the requirements of many real-time applications, due to the sequential scheme and the high memory, bandwidth and computational costs. This paper proposes Patra, a novel parallel tree-reweighted message passing architecture, which involves a fully pipelined design targeting FPGA technology. We build a hybrid CPU/FPGA system to test the performance of Patra for stereo matching. Experimental results show that Patra provides about 100 times faster than a software implementation of TRW-S, and 12 times faster than a GPU-based message passing algorithm. Compared with an existing design in four FPGAs, we can achieve 2 times speedup in a single FPGA. Moreover, Patra can work at video rate in many cases, such as a rate of 167 frame/sec for a standard stereo matching test case, which makes it promising for many real-time applications.

关键词： Field programmable gate arrays Message passing Algorithm design and analysis Bandwidth Random access memory Accuracy Vectors

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Dynamically tolerating and detecting asymmetric races

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2014年第8期51卷 1748-1763页

作者： Wang, Wenwen Wu, Chenggang Ratanaworabhan, Paruj Yuan, Xiang Wang, Zhenjiang Li, Jianjun Feng, Xiaobing Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Faculty of Engineering Kasetsart University Bangkok10900 Thailand

Asymmetric races are a common type of data races. They are triggered when a thread accesses a shared variable in a critical section, and another thread accesses the same shared variable not in any critical section, or in a critical section guarded by a different lock. Asymmetric races in multi-threaded programs are usually harmful. To solve the problem introduced by asymmetric races, ARace is proposed. ARace utilizes shared variable protecting and write buffer to dynamically tolerate and detect asymmetric races. Shared variable protecting is used to protect shared variables that are read-only and read-before-write in critical sections, and these shared variables should not be modified out of critical sections;write buffer is used to buffer the writing operations to shared variables in critical sections. ARace can not only tolerate asymmetric races triggered by shared variable accesses in and out of critical sections, but also detect asymmetric races triggered by shared variable accesses in concurrent critical sections. ARace can be directly applied to binary code and requires neither additional compiler support nor hardware support. In addition, an implementation based on dynamic binary instrumentation is also proposed. The experimental results demonstrate that ARace guarantees the tolerance and detection of asymmetric races while incurring acceptable performance and memory overhead.

关键词：非对称数据竞争容忍和检测写缓冲区页保护动态二进制插桩

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Social incentive policies to engage commercial building occupants in demand response

Social incentive policies to engage commercial building occu...

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IEEE International Conference on Automation Science and Engineering (CASE)

作者： Sisi Li Kun Deng MengChu Zhou Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Coordinated Science Laboratory University of Illinois at Urbana-Champaign Urbana IL USA Key Laboratory of Embedded System and Service Computing Tongji University Shanghai China

Occupants' comfort is the primary target in a building operation. However their efforts are often neglected and ruled out from traditional control strategies of energy-efficient building management systems. Occupant-engaged control strategies have recently attracted many research attentions and demonstrated great potentials for energy saving. With them, occupants' behavior is incorporated into the closed-loop control methods in which their initiatives actively contribute to building services and energy utility by explicitly expressing their preferences. This work proposes an occupant-engaged demand response (DR) strategy for building automation in which occupants are actively engaged to adapt their energy consumption in response to incentive opportunities designed by facility managers. A model-based study and a Nash-Equilibrium-based solution are provided to assist facility managers with the design of social incentive policies to promote occupant participation, along with the guarantee of lucrativeness for a DR event.

关键词： Games Electricity Load management Building automation Companies

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Synchronization of nonlinearly coupled complex networks under periodically intermittent pinning control

Synchronization of nonlinearly coupled complex networks unde...

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第25届中国控制与决策会议

作者： Xiwei Liu Cheng Cheng Department of Computer Science and Technology Tongji University and the Key Laboratory of Embedded System and Service Computing Ministry of Education

ISBN: (纸本)9781467355339

In this paper, we investigate the synchronization problem for nonlinearly coupled networks under periodically intermittent pinning control, where the coupling matrix denoting network topology is assumed to be symmetric. A sufficient condition to guarantee global synchronization is presented. Moreover, a centralized adaptive intermittent control is designed and its validity is rigorously proved. Finally, some numerical examples are presented to demonstrate the correctness of obtained theoretical results.

关键词： Synchronization, Consensus, Complex networks, Nonlinearly coupled, Periodically, Intermittent pinning, Adaptive control.

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Achievable sum rate analysis of ZF receivers in 3D MIMO with Rayleigh/log-normal fading channels

Achievable sum rate analysis of ZF receivers in 3D MIMO with...

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IEEE Globecom Workshops

作者： Fangqing Tan Hui Gao Tiejun Lv Jie Zeng Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications Beijing China Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9781479974719

Three dimensions multiple-input multiple-output (3D MIMO) system is now gaining a growing interest among researchers in wireless communication, the reason can be attributed to its potential to enable a variety of strategies like user specific 3D beamforming and cell-splitting. In this paper, we pursue the performance evaluation of 3D MIMO system employing zero-forcing (ZF) receivers, accounting for both large and small-scale fading. In particular, we consider the classical log-normal model and antenna gain with tilting angle, we derive the optimal tilting angle for 3D MIMO system which maximizes the sum rate, furthermore, based on the optimal tilting angle, we propose a closed-form linear approximation on the achievable sum rate in the asymptotically high signal-to-noise ratio (SNR) and low-SNR regime, respectively. We investigate the effect of antenna tilting angle, number of base station (BS) antennas and the distance between BS and the center of building on the achievable sum rate performance of 3D MIMO.

关键词： MIMO Three-dimensional displays Fading Antennas Receivers Signal to noise ratio Linear approximation

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Cluster synchronization of nonlinearly coupled networks via periodically intermittent pinning control

Cluster synchronization of nonlinearly coupled networks via ...

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第三十二届中国控制会议

作者： LIU Xiwei CHENG Jiujun Department of Computer Science and Technology Tongji Universityand the Key Laboratory of Embedded System and Service ComputingMinistry of Education

ISBN: (纸本)9781479900305

In this paper,the cluster synchronization problem for nonlinearly coupled networks under periodically intermittent pinning control is *** first,a sufficient condition to guarantee cluster synchronization is ***,an adaptive intermittent control algorithm is designed to the control strength and its validity is rigorously ***,some numerical examples are presented to demonstrate the correctness of obtained theoretical results.

关键词： Cluster synchronization Adaptive Nonlinearly coupled Periodically Intermittent pinning.

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PICEA-g using an enhanced fitness assignment method

PICEA-g using an enhanced fitness assignment method

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IEEE Symposium on Computational Intelligence in Multi-Criteria Decision-Making, MCDM

作者： ZhiChao Shi Rui Wang Tao Zhang College of Information System and Management State Key Laboratory of High Performance Computing National University of Defense Technology ChangSha Hunan P.R. China

ISBN: (纸本)9781479944668

The preference-inspired co-evolutionary algorithm using goal vectors (PICEA-g) has been demonstrated to perform well on multi-objective problems. The superiority of PICEA-g originates from the smart fitness assignment, that is, candidate solutions are co-evolved with goal vectors along the search. In this study, we identify a limitation of this fitness assignment method, and propose an enhanced fitness assignment method which considers both the performance of goal vectors and the Pareto dominance rank on the fitness calculation of candidate solutions. Experimental results show that PICEA-g with the enhanced approach is effective, especially for bi-objective problems.

关键词： Vectors Evolutionary computation Pareto optimization Benchmark testing Sociology

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SeaBase: An Implementation of Cloud Database

SeaBase: An Implementation of Cloud Database

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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Shusheng Guo Zimu Yuan Li Zha Zhiwei Xu State Key Laboratory of Computer System and Architecture University of Chinese Academy of Sciences Beijing China Institute of Computing Technology Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781479967162

Cloud database usually refers to a database based on the cloud computing technology. However, as far as we know, pre-existing solutions of cloud database cannot integrate the data from multi-sourced heterogeneous databases, only supplying an isolated homogeneous database cluster. This paper presents a new implementation approach for cloud database: Sea Base, which integrates various data types into a unified one, based on the CCEVP(Cloud computing-based Effective-Virtual-Physical) model. The results of our experiments show that Sea Base is feasible and practical.

关键词： Databases Cloud computing Computational modeling Data integration Computers Computer architecture Data models

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