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MMSE relay precoding schemes based on quantization error compensation for multi-relay system

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Science China(information Sciences) 2010年第12期53卷 2548-2556页

作者： LI Ting 1,2 & YANG LuXi 2 1 College of Communication and information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China 2 school of information Science and Engineering,Southeast University,Nanjing 210096,China 1. College of Communication and information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China2. School of Information Science and Engineering Southeast University Nanjing 210096 China

In order to deal with the performance degradation resulting from the quantization error,this paper introduces the statistics of Grassmannian codebook's quantization error into relay precoding design for multirelay *** on the two-step MMSE optimization algorithm for relay precoding and receiver equalizing with full feedback under QoS requirements,we first propose a limited feedback two-step MMSE optimization scheme for relay precoding and receiver equalizing with quantization error compensation,and then we propose a limited feedback joint MMSE optimization scheme for relay precoding and receiver equalizing with quantization error compensation subject to a global power constraint at the output of *** results show that the proposed joint MMSE optimization scheme with quantization error compensation has a much lower bit-error rate than the two-step MMSE optimization scheme with quantization error compensation and the joint MMSE optimization scheme without quantization error compensation.

关键词： multi-relay precoding limited feedback minimum mean square error

Twisted Ate pairing on hyperelliptic curves and applications

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Science China(information Sciences) 2010年第8期53卷 1528-1538页

作者： ZHANG FangGuo 1,2 1 school of information Science and Technology, Sun Yat-Sen University, Guangzhou 510275, China 2 Guangdong Key Laboratory of information Security Technology, Guangzhou 510275, China 1. school of information Science and Technology Sun Yat-Sen University Guangzhou 510275 China2. Guangdong Key Laboratory of Information Security Technology Guangzhou 510275 China

In this paper we show that the twisted Ate pairing on elliptic curves can be generalized to hyperelliptic curves, and give a series of variations of the hyperelliptic Ate and twisted Ate pairings. Using the hyperelliptic Ate pairing and twisted Ate pairing, we propose a new approach to speeding up the Weil pairing computation. For some hyperelliptic curves with high degree twist, computing Weil pairing by our approach may be faster than Tate pairing, Ate pairing, and all other known pairings.

关键词： Ate pairing Weil pairing hyperelliptic curves pairing-based cryptosystems twisted curves

Precise point positioning and its application in mining deformation monitoring

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中国有色金属学会会刊：英文版 2011年第S3期21卷 499-505页

作者： XU Chang-hui1, 2, WANG Jin-ling2, GAO Jing-xiang1, WANG Jian1, HU Hong1 1. school of Environment and Spatial information, China University of Mining and Technology, Xuzhou 22116, China 2. school of Surveying and Spatial information Systems, University of New South Wales, Sydney 2052, Australia [a] school of Environment and Spatial information China University of Mining and Technology Xuzhou 22116 China [b] school of Surveying and Spatial information Systems University of New South Wales Sydney 2052 Australia

Precise point positioning (PPP)-based deformation monitoring scheme is presented for the use in mining deformation monitoring. Within the solutions of daily observation, outliers are detected and removed to avoid any potential misinterpretation of the results and then the deformation can be extracted by the coordinate differences between the two consecutive solutions. Meanwhile, because of the special location of a rover station in mining areas, the satellite geometry may be insufficient for a reasonable PPP solution, and the multipath impact an also be significant. Therefore, it is necessary to predict the satellite geometry before any daily observation. To evaluate the ability of extracting the deformation using the PPP-based method, various quality measures were introduced. The results of three datasets of the same station show that the precision of deformation monitored by PPP can reach up to cm level and even mm level.

关键词： precise point positioning deformation monitoring outlier identification geometry multipath

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Stabilization for discrete-time fuzzy systems with Takagi-Sugeno's models:reduce the complexity

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Science China(information Sciences) 2010年第12期53卷 2506-2513页

作者： WANG LiKui 1 & LIU XiaoDong 2 1 school of Mathematics and information Science,Nanchang Hangkong University,Nanchang 330063,China 2 Research Center of information and Control,Dalian University of Technology,Dalian 116024,China 1. school of Mathematics and information Science Nanchang Hangkong University Nanchang 330063 China2. Research Center of Information and Control Dalian University of Technology Dalian 116024 China

The problem of sate feedback control for discrete-time fuzzy systems with Takagi-Sugeno's models is investigated to reduce the computational burden.A stabilization condition is obtained by applying a new Lyapunov *** is shown that our new theorem is equivalent to an existing result in guaranteeing the stability of the fuzzy system but consumes less computational time than the *** effectiveness and the superiority of the proposed design approach are demonstrated by an example borrowed from the literature.

关键词： Takagi-Sugeno’s fuzzy model non-quadratic Lyapunov function linear matrix inequality

Adaptive synchronization of neural networks with different attractors

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Progress in Natural Science:Materials International 2007年第6期17卷 687-695页

作者： Zhang Huaguang1, Guan Huanxin1 and Wang Zhanshan1,2(1. school of information Science and Engineering, Northeastern University, Shenyang 110004, China 2. school of information Science and Engineering, Shenyang Ligong University, Shenyang 110168, China) [a]school of information Science and Engineering Northeastern University Shenyang China [b]school of information Science and Engineering Shenyang Ligong University Shenyang China

This paper aims to present an adaptive control scheme for the synchronization of two classes of uncertain neural networks with different attractors. A new sufficient condition for the global synchronization of two kinds of neural networks with different attractors is derived. The proposed control method is efficient and easy to be implemented. Numerical simulation is used to show the effectiveness of the obtained result.

关键词： neural networks attractor adaptive synchronization linear matrix inequality.

Fuzzy H∞ Filter Design for a Class of Nonlinear Systems with Time Delays via LMI

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自动化学报 2005年第3期 64-71页

作者： LUN Shu-Xian~(1’2) ZHANG Hua-Guang~1 ~1(school of information Science and Engineering,Northeastern University,Shenyang 110004)~2(school of information Science and Engineering,Bohai University,Jinzhou 110004)

This paper develops fuzzy Hfilter for state estimation approach for nonlinear discrete- time systems with multiple time delays and unknown bounded *** design a stable fuzzy Hfilter based on the Takagi-Sugeno (T-S) fuzzy model,which assures asymptotic stability and a prescribed Hindex for the filtering error *** condition for the existence of such a filter is established by solving the linear matrix inequality (LMI) *** LMI problem can be efficiently solved with global convergence using the interior point *** examples are provided to illustrate the design procedure of the proposed method.

关键词： Nonlinear systems H_∞ filter state estimation Takagi-Sugeno fuzzy model time delays linear matrix inequality(LMI)

Steganalysis of stochastic modulation steganography

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Science in China(Series F) 2006年第3期49卷 273-285页

作者： HE Junhui1,2 & HUANG Jiwu1,2 1. school of information Science and Technology, Sun Yat-sen University, Guangzhou 510275, China 2. Guangdong Province Key Laboratory of information Security, Guangzhou 510275, China 1. school of information Science and Technology Sun Yat-sen University Guangzhou 510275 China 2. Guangdong Province Key Laboratory of information Security Guangzhou 510275 China

Stochastic modulation steganography embeds secret message within the cover image by adding stego-noise with a specific probabilistic distribution. No method is known to be applicable to the estimation of stochastic modulation steganography. By analyzing the distributions of the horizontal pixel difference of images before and after stochastic modulation embedding, we present a new steganalytic approach to accurately estimate the length of secret message in stochastic modulation steganography. The pro- posed method first establishes a model describing the statistical relationship among the differences of the cover image, stego-image and stego-noise. In the case of stegoimage-only steganalysis, rough estimate of the distributional parameters of the cover image＇s pixel difference is obtained with the use of the provided stego-image. And grid search and Chi-square goodness of fit test are exploited to estimate the length of the secret message embedded with stochastic modulation steganography. The experimental results demonstrate that our new approach is effective for steganalyzing stochastic modulation steganography and accurately estimating the length of the secret message.

关键词： information hiding steganography steganalysis stochastic modulation statistical distribution models of difference.

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Predictive control and scheduling codesign in network control systems

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控制理论与应用（英文版） 2010年第2期8卷 239-244页

作者： Qing SHEN 1 , 2 , Weihua GUI 2 , Ying XIONG 2 , Chunhua YANG 2 (1.school of Basic Education for Officers, National University of Defense Technology, Changsha Hunan 410003, China 2.school of information Science and Engineering, Central South University, Changsha Hunan 410083, China) school of Basic Education for Officers National University of Defense Technology Changsha Hunan China school of information Science and Engineering Central South University Changsha Hunan China

A codesign approach combining predictive control compensation and network scheduling is presented in this paper to overcome the adverse influences of stochastic time delays and packet losses encountered in network-based real-time control systems. The state estimation and control prediction compensation algorithms are used for the random network delays in the feedback and forward channels, and the stability criteria are analyzed. The proper sampling rate is given with network scheduling to meet the desired system performance, while the network-induced delay is tolerated. Simulations show that the codesign approach works well with the bounded network delay.

关键词： Network control system Prediction Scheduling Stability

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An aperiodic phenomenon of the unscented Kalman filter in filtering noisy chaotic signals

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Progress in Natural Science:Materials International 2007年第10期17卷 1235-1240页

作者： Fan Hongjuan1, Feng Jiuchao1,2, Xie Shengli2 and Wang Shiyuan1(1. Faculty of Electronic and information Engineering ,Southwest University, Chongqing 400715, China 2. school of Electronic and information Engineering, South China University of Technology, Guangzhou 510641, China) Faculty of Electronic and information Engineering Southwest University Chongqing 400715 China school of Electronic and information Engineering South China University of Technology Guangzhou 510641 China

A non-periodic oscillatory behavior of the unscented Kalman filter (UKF) when used to filter noisy contaminated chaotic signals is reported. We show both theoretically and experimentally that the gain of the UKF may not converge or diverge but oscillate aperiodically. More precisely, when a nonlinear system is periodic, the Kalman gain and error covariance of the UKF converge to zero. However, when the system being considered is chaotic, the Kalman gain either converges to a fixed point with a magnitude larger than zero or oscillates aperiodically.

关键词： chaos unscented Kalman filter Lyapunov exponents aperiodicity.