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Impulsive synchronization of two nonidentical chaotic systems with time-varying delay

Physics Letters A 2011年第3期375卷 498-504页

作者： Wangli He Feng Qian Jinde Cao Qing-Long Han The Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai 200237 China Centre for Intelligent and Networked Systems Central Queensland University Rockhampton QLD 4702 Australia School of Information and Communication Technology Central Queensland University Rockhampton QLD 4702 Australia Department of Mathematics Southeast University Nanjing 210096 China

This Letter investigates synchronization of two nonidentical Lur'e systems with time-varying delay and parameter mismatches via impulsive control. Based on the theory of impulsive functional differential equations, sufficient conditions for impulsive synchronization with a bound on the synchronization error are derived. An illustrative example is provided to validate the proposed method.

关键词： Impulsive synchronization Impulsive control Nonidentical chaotic systems Time-varying delay

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A stop and go blind equalization algorithm for QAM signals

A stop and go blind equalization algorithm for QAM signals

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International Conference on Wireless communications, Networking and Mobile Computing (WiCom)

作者： Wei, Xue Xiaoniu, Yang Zhaoyang, Zhang National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang 314033 China Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang 310027 China

ISBN: (纸本)9781424437092

The constant modulus algorithm (CMA) has been widely used in the blind equalization of quadrature amplitude modulation (QAM) signals, but it has slow convergence rate and large steady state mean square error and the phase blind nature. In this paper, a modified constant modulus algorithm which incorporates a stop and go technique is proposed. The proposed algorithm can speed up convergence rate and decrease steady state mean square error and correct phase error and frequency offset simultaneously. The simulation results demonstrate the effectiveness of the proposed algorithm in improving convergence behavior and bit error rate (BER) performance. © 2010 IEEE.

关键词： Blind equalization

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A variable step size blind equalization algorithm for QAM signals

A variable step size blind equalization algorithm for QAM si...

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2010 International Conference on Microwave and Millimeter Wave technology, ICMMT 2010

ISBN: (纸本)9781424457052

The constant modulus algorithm (CMA) is one widely used algorithm for blind equalization of quadrature amplitude modulation (QAM) signals. The algorithm exhibits slow convergence rate and large steady state mean square error and the phase blind nature in comparison with the algorithms used in conventional data-aided equalization schemes. In this paper, a variable step size modified constant modulus algorithm is proposed. The proposed algorithm can achieve fast convergence rate and decrease steady state mean square error and correct phase shift and carrier frequency offset at the same time. The simulation results demonstrate the effectiveness of the proposed algorithm in improving convergence behavior and bit error rate performance. © 2010 IEEE.

关键词： Blind equalization

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A carrier recovery algorithm for high order QAM signals

A carrier recovery algorithm for high order QAM signals

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International Conference on Wireless communications, Networking and Mobile Computing

作者： Xue, Wei Yang, Xiaoniu Zhang, Zhaoyang National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang 314033 China Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang 310027 China

ISBN: (纸本)9781424437092

The carrier recovery is one key technique in the demodulation of high order quadrature amplitude modulation (QAM) signals. A carrier recovery algorithm which switches between multi-threshold polarity decision mode and decision directed mode according to the standard deviation of the frequency of numerically controlled oscillator (NCO) is proposed. The proposed algorithm can detect a proper time for the mode switch to yield lower steady state error. The simulation results demonstrate the effectiveness of the proposed algorithm in improving the performance of blind carrier recovery. © 2010 IEEE.

关键词： Quadrature amplitude modulation

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Recognition and parameter estimation of MPSK signals based on instantaneous phase difference

Recognition and parameter estimation of MPSK signals based o...

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6th International Conference on Wireless communications, Networking and Mobile Computing (WICOM)

作者： Song, Chunyun Zhan, Yi Guo, Lin National Laboratory of Information Control Technology for Communication System 2. No.36 Research Institute of CETC Zhejiang China Shanghai Acoustic Laboratory Institute of Acoustic Chinese Academy of Science Shanghai China

ISBN: (纸本)9781424437092

There many researches about modulation mode classification of the MPSK signals, but these studies pay few attentions to some especial MPSK signals such as OQPSK or pi/4QPSK. However, the signals are very important in the digital communications. The method of classification of the QPSK, OQPSK, pi/4QPSK and 8PSK has discussed in this paper, because these MPSK signals have similar constellations or spectrum. The method of the classification and parameter estimation based on the statistical and spectral characters of the instantaneous phase difference (IPD) is proposed. The simulation results of the digital signals indicate that this method is availability when the SNR is higher than 5dB.

关键词： modulation recognition parameter estimation instantaneous phase difference OQPSK pi/4QPSK

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Analyzing and correlating security events using state machine

Analyzing and correlating security events using state machin...

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10th IEEE International Conference on Computer and information technology, CIT-2010, 7th IEEE International Conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and communications, ScalCom-2010

作者： Feng, Xuewei Wang, Dongxia Zeng, Jiemei Ma, Guoqing Li, Jin National Key Laboratory of Science and Technology on Information System Security Beijing Institute of System Engineer Beijing 100101 China Beijing Aerospace Control Center Beijing 100296 China

ISBN: (纸本)9780769541082

It is unfeasible to analyze the security events by the manual way for the security manager, because the number of the events is huge and the information contained in the events is meaningless. After analyzing the existing algorithms of security events correlation, we propose an attack scenario reconstruction technology based on state machine. The processes of attackers intruding into the cyberspace can be restored and the more comprehensive attack scenario description information will be generated using this technology. This working lets the security manager more comfy. The state machine based attack scenario reconstruction technology processes security events using clustering analysis and causal analysis concurrently, it builds a correlation state machine in memory for every attack scenario tree which is predefined by the security manager, when security events are coming, the certain state machines will process them, if the condition is satisfied, an attack scenario description information will be generated and then sent to the security manager. The correlating technology based on state machine is more timely and accurately, and at last, we use the DARPA2000 Intrusion Scenario Specific Data Sets to validate the technology, the experiment results show that it is feasible to analyze security events using the technology we proposed. © 2010 IEEE.

关键词： Managers

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A variable step size algorithm for blind equalization of QAM signals

A variable step size algorithm for blind equalization of QAM...

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ISBN: (纸本)9781934142141

The constant modulus algorithm (CMA) is one widely used algorithm for blind equalization of QAM signals. The algorithm exhibits slow convergence rate and large steady state mean square error and the phase-blind nature in comparison with the algorithms used in conventional data-aided equalization schemes. In this paper, a variable step size modified constant modulus algorithm is proposed. The proposed algorithm can speed up convergence rate and decrease steady state mean square error and correct phase error and frequency offset at the same time. The simulation results demonstrate the effectiveness of the proposed algorithm in improving convergence rate and reducing steady state mean square error.

关键词： Mean square error

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An approach for design and formal verification of safety-critical software

An approach for design and formal verification of safety-cri...

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2010 International Conference on Computer Application and System Modeling, ICCASM 2010

作者： Ma, Wei-Gang Hei, Xin-Hong School of Computer Science and Engineering Xi'an University of Technology Xi'an Shaanxi 710071 China Key Laboratory of Computer Networks and Information Security Xidian University Ministry of Education Xi'an Shaanxi 710071 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424472369

A modeling and verification methodology is presented for railway interlocking system which is regarded as a safety-critical system. The methodology utilizes UML (Unified Modeling Language) to model the function requirement and FSM (Finite State Machine) to verity the safety requirements of the specification. The device specifications of railway interlocking system are modeled with UML, and dynamic behaviors of the device and whole system are modeled with FSM, the safety specification is translated LTL (Linear Temporal Logic) and analyzed with NuSMV. We try to show the feasibility of improving the reliability and reducing revalidation efforts when designing and developing a decentralized railway signaling system.

关键词： Unified Modeling Language

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Properties of Prisoner's Dilemma Game based on genetic algorithm

Properties of Prisoner's Dilemma Game based on genetic algor...

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作者： Wang, Tao Chen, Zhi-Gang Deng, Xiao-Heng Zhagn, Jin School of Information Science and Engineering Center South University Changsha 410083 China School of Computer and Communication Hunan University Changsha 410082 China National Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9787894631046

Evolutionary games are widely studied in the fields of biology, sociology, economics and informatics. People's interests focus on how cooperation emerged in a system that individuals are selfish. We studied the iterated Prisoner's Dilemma Game evolved on BA network with genetic algorithm. Nodes in network could remember the game historical strategies and coded into gene. We show that memory length has gentle effect on cooperation level, and that some characteristic genes and frequentlyused genes emerge after some generations. We also find that cooperate strategy distributed on different degree-nodes equably. These findings give new perspectives to the illustration of cooperation behavior in biological group and society.

关键词： Genes

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Analyzing and Correlating security Events Using State Machine

Analyzing and Correlating Security Events Using State Machin...

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International Conference on Computer and information technology (CIT)

作者： Feng Xuewei Wang Dongxia Zeng Jiemei Ma Guoqing Li Jin National Key Laboratory of Science and Technology on Information System Security Beijing Institute Beijing China Beijing Aerospace Control Center Beijing China

关键词： Correlation Cyberspace Computer crime Engines XML Protocols

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