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International Conference on Microwave and Millimeter Wave technology Proceedings

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

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.

关键词： Blind equalizers Quadrature amplitude modulation Steady-state Convergence Mean square error methods Baseband Intersymbol interference Adaptive equalizers Laboratories communication system control

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

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

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 π/4QPSK. However, the signals are very important in the digital communications. The method of classification of the QPSK, OQPSK, π/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： Phase shift keying Signal to noise ratio Estimation Frequency estimation Classification algorithms

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A model checking approach for solving epistemic riddles

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Jisuanji Xuebao/Chinese Journal of Computers 2010年第3期33卷 406-413页

作者： Luo, Xiang-Yu Su, Kai-Le Gu, Ming Key Laboratory of Security for Information System of Ministry of Education School of Software Tsinghua University Beijing 100084 China School of Computer and Control Guilin University of Electronic Technology Guilin Guangxi 541004 China School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

This paper aims to model and solve the Sum and Product Riddle in public announcement logic. A dynamic epistemic model is proposed, that is the linear temporal combination of the epistemic model of environment and the epistemic models after each announcement, such that the authors' model checking technique for temporal epistemic logic can be extended to support the modeling and verification of public announcement logic. This model checking method not only can help to find all solutions, but also verify related temporal epistemic properties. Such characteristic is not fully supported by the current version of MCK, MCMAS and DEMO. The authors implemented the proposed method in the symbolic model checker MCTK via OBDD and verified the sum and product riddle. The experimental results show that the proposed method is correct and efficient.

关键词： Model checking

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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 (WiCom)

作者： Wei Xue Xiaoniu Yang Zhaoyang Zhang Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang China National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang China Dept. of Inf. Sci. & Electron. Eng. Zhejiang Uinversity Hangzhou China

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.

关键词： Phase locked loops Quadrature amplitude modulation Steady-state Detectors Signal processing algorithms Constellation diagram Simulation

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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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Chinese control Conference (CCC)

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

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 frequently used 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： Games History Biological cells Evolution (biology) Barium Probability

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Threshold Quantum Secret Sharing of Secure Direct communication

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Chinese Physics Letters 2009年第1期26卷 21-24页

作者：李宝奎杨宇光温巧燕 Department of Automatic Control School of Information Science and Technology Beijing Institute of Technology Beijing 100081 College of Computer Science and Technology Beijing University of Technology Beijing 100124 State Key Laboratory of Integrated Services Network Xidian University Xi'an 710071 State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876

We propose a （L, n）-threshold quantum secret sharing protocol of secure direct communication following some ideas of Zhang＇s protocol [Phys. Lett. A 342 （2005） 60] and Tokunaga et al.＇s protocol [Phys. Rev. A 71 （2005） 012314]. The sender distributes the classical secret shares to his or her n agents and each agent owns a secret share in advance. The sender＇s secure direct communication message can be extracted by an agent subset by collaboration in such a way that at least t or more agents can obtain the secret message with the mutual assistances but any t - 1 or fewer agents cannot. In contrast to the previous multiparty quantum secret sharing protocols in which the sender＇s secret message can be recovered only if all the agents collaborate, our protocol is more practical and more flexible.

关键词： QUANTUM communication COMPUTER network protocols DIGITAL communications MESSAGE theory (communication) MATHEMATICAL physics WIRELESS communication systems

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Ear Detection Based on Arc-Masking Extraction and AdaBoost Polling Verification

Ear Detection Based on Arc-Masking Extraction and AdaBoost P...

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International Conference on Intelligent information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Hao-Chung Shih Chian C. Ho Hsuan T. Chang Chin-Song Wu Department of Electrical Engineering National Yunlin University of Science and Technology Yunlin Taiwan Information & Communication Security Laboratory Chunghwa Telecom Laboratories Taoyuan Taiwan

This paper proposes a simple but practical 2D ear detection algorithm based on arc-masking candidate extraction and AdaBoost polling verification. In the first half phase of the proposed ear detection algorithm, a few ear candidates are extracted by arc-masking edge search followed by multilayer mosaic and orthogonal projection histogram. Then, in the second half phase, the most likely ear candidate is picked out by rough AdaBoost polling verification. Experimental results show that the proposed ear detection algorithm can achieve a bit higher detection hit rate and much lower detection false alarm rate than conventional AdaBoost ear detection algorithm with Haar-like features under various pose rotation conditions.

关键词： Ear Detection algorithms Face detection Face recognition Image edge detection Skin Head Fingerprint recognition Biometrics Principal component analysis

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Calculating Minimum Buffer Requirement of Constant Rate Transmission Scheme Based on SVM

Calculating Minimum Buffer Requirement of Constant Rate Tran...

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International Conference on Computer and information technology (CIT)

作者： Zilei Wang Hongsheng Xi Guo Wei Key Laboratory of Network Communication System and Control Chinese Academy of Sciences University of Science and Technology Hefei Anhui China Department of Electronic Engineering and Information Science USTC Hefei Anhui China

Constant rate transmission and transport (CRTT) is an effective bandwidth smoothing scheme resulting in one fixed rate during the whole duration of variable bit-rate video, which, however, needs a large client buffer size. The minimum buffer requirement (MBR) of CRTT, besides benefiting the design of some piecewise transmission scheme, can examine whether we can transmit the requested video with a constant rate for a given buffer size. In this paper, we formulate off-line bandwidth smoothing into a binary classification problem of the underflow and overflow points. Then we propose a novel algorithm based on support vector machine because of its equal margin, which,we have proven, is able to minimize the required buffer size of CRTT. Our algorithm, therefore, can exactly calculate MBR together with the CRTT transmission rate without exhaustively searching buffer sizes and startup delay. The simulation results using some real MPEG4 and H.264 video show the philosophy and effectiveness of our algorithm.

关键词： Support vector machines Smoothing methods Bandwidth Support vector machine classification Streaming media Video compression Computer networks Delay MPEG 4 Standard Buffer storage

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Subspace Semi-supervised Fisher Discriminant Analysis

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自动化学报 2009年第12期35卷 1513-1519页

作者： YANG Wu-Yi LIANG Wei XIN Le ZHANG Shu-Wu Hi-tech Innovation Center Institute of Automation Chinese Academy of Sciences Beijing 100190 P.R. China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Minister of Education Xiamen University Xiamen 361005 P. R. China College of Oceanography and Environmental Science Xiamen University Xiamen 361005 P. R. China School of Electronics Information and Control Engineering Beijing University of Technology Beijing 100124 P. R. China

Fisher discriminant analysis (FDA) is a popular method for supervised dimensionality reduction. FDA seeks for an embedding transformation such that the ratio of the between-class scatter to the within-class scatter is maximized. Labeled data, however, often consume much time and are expensive to obtain, as they require the efforts of human annotators. In order to cope with the problem of effectively combining unlabeled data with labeled data to find the embedding transformation, we propose a novel method, called subspace semi-supervised Fisher discriminant analysis (SSFDA), for semi-supervised dimensionality reduction. SSFDA aims to find an embedding transformation that respects the discriminant structure inferred from the labeled data and the intrinsic geometrical structure inferred from both the labeled and unlabeled data. We also show that SSFDA can be extended to nonlinear dimensionality reduction scenarios by applying the kernel trick. The experimental results on face recognition demonstrate the effectiveness of our proposed algorithm.

关键词：费希尔判别分析法鉴别分析离散度降维方法

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Subspace Semi-supervised Fisher Discriminant Analysis

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Acta Automatica Sinica 2009年第12期35卷 1513-1519页

作者： Wu-Yi YANG Wei LIANG Le XIN Shu-Wu ZHANG Hi-tech Innovation Center Institute of Automation Chinese Academy of Sciences Beijing 100190 P. R. China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Minister of Education Xiamen University Xiamen 361005 P. R. China College of Oceanography and Environmental Science Xiamen University Xiamen 361005 P. R. China School of Electronics Information and Control Engineering Beijing University of Technology Beijing 100124 P. R. China

关键词： Fisher discriminant analysis (FDA) semi-supervised learning manifold regularization dimensionality reduction

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