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International Conference on Wireless communications and Signal Processing

作者： Pengwu Wan Zan Li Benjian Hao Boyang Liu Jianfeng Zhu State Key Laboratory of Integrated Services Networks Xidian University Science and Technology on Communication Information Security Control Laboratory

ISBN: (纸本)9781509028610

The passive synthetic aperture antenna array (P-SAAA) technology is inspired by the idea of synthetic aperture sonar and synthetic aperture radar, which is a new method used to the passive radar source localization using only one small aircraft. Virtual time difference of arrival (VTDOA) estimation is critical for the PSAAA technology, it is defined as the time difference of the radar pulse transmission from the radar source position to different virtual receivers, where the virtual receivers are the flight track position of the small aircraft at different flight time. In this paper, we present three different algorithms of curve fitting to approximate the main-beam pattern of the radar antenna, then the VTDOA can be estimated using the corresponding time of the peak of the curve. The simulation results show that the second-order polynomial of the least squares (LS) curve fitting algorithm is the optimal method to approximate the main beam pattern of the radar antenna at the receiver, which also is the optimal method to be used in the VTDOA estimation.

关键词： Passive Localization Virtual Time Differences of Arrival Passive Synthetic Aperture Antenna Array Curve Fitting Radar

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High visibility temporal ghost imaging with classical light

arXiv

引用

arXiv 2017年

作者： Liu, Jianbin Wang, Jingjing Chen, Hui Zheng, Huaibin Liu, Yanyan Zhou, Yu Li, Fu-Li Xu, Zhuo Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research Xi'an Jiaotong University Xi'an710049 China Science and Technology on Electro-Optical Information Security Control Laboratory MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied Physics Xi'an Jiaotong University Xi'an710049 China

High visibility temporal ghost imaging with classical light is possible when superbunching pseudothermal light is employed. In the numerical simulation, the visibility of temporal ghost imaging with pseudothermal light equaling (4.7 ± 0.2)% can be increased to (75 ± 8)% in the same scheme with superbunching pseudothermal light. The reasons for the difference in visibility and quality of the retrieved images in different situations are discussed in detail. It is concluded that high visibility and high quality temporal ghost image can be obtained by collecting large enough number of data points. The results are helpful to understand the difference between ghost imaging with classical light and entangled photon pairs. The superbunching pseudothermal light can be employed to improve the image quality in ghost imaging applications. Copyright © 2017, The Authors. All rights reserved.

关键词： Visibility

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New quaternary sequences of even length with optimal auto-correlation

arXiv

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arXiv 2017年

作者： Su, Wei Yang, Yang Zhou, Zhengchun Tang, Xiaohu School of Economics and Information Engineering Southwestern University of Finance and Economics Chengdu610074 China School of Mathematics Southwest Jiaotong University Chengdu611756 Provincial Key Lab of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu611756 Science and Technology on Communication Security Laboratory Chengdu610041

Sequences with low auto-correlation property have been applied in code-division multiple access communication systems, radar and cryptography. Using the inverse Gray mapping, a quaternary sequence of even length N can be obtained from two binary sequences of the same length, which are called component sequences. In this paper, using interleaving method, we present several classes of component sequences from twin-prime sequences pairs or GMW sequences pairs given by Tang and Ding in 2010;two, three or four binary sequences defined by cyclotomic classes of order 4. Hence we can obtain new classes of quaternary sequences, which are different from known ones, since known component sequences are constructed from a pair of binary sequences with optimal auto-correlation or Sidel'nikov sequences. Copyright © 2017, The Authors. All rights reserved.

关键词： Binary sequences

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Modified CORDIC Algorithm for Computation of Arctangent with Variable Iterations

Modified CORDIC Algorithm for Computation of Arctangent with...

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2016 IEEE 13th International Conference on Signal Processing（ICSP2016）

作者： Huijie Zhu Yizhou Ge Bin Jiang Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of China Electronics Technology Group Corporation

In this paper, a modified CORIDC algorithm for computation of arctangent is presented. Unlike the conventional CORDIC algorithm which has constant number of iterations, the proposed algorithm calculates the nearest predefined angle to the input phase at the beginning of every iteration and then rotates by an optimal angle. As it has variable iterations, the novel rotation strategy provides faster convergence speed that reduces the number of iterations with respect to the previous approaches. Further, the performance of the proposed algorithm is improved when compared with that of the conventional one at cost of the same maximum shift number. With a number of simulation experiments, the performance of the proposed algorithm is validated by the numerical results.

关键词： CORDIC Arctangent Vectoring mode

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A Study on the Influence of Bit Error Ratio against Jamming Signal Ratio under Different Channel Jamming

A Study on the Influence of Bit Error Ratio against Jamming ...

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International Symposium on Computational Intelligence and Design, ISCID

作者： Huan Li Wenhua Ye No.36 Research Institute of CETC Jiaxing Zhejiang China Science Technology on Communication Information Security Control Laboratory

ISBN: (纸本)9781509035595

The performance of digital communication systems, depending on the signal modulation and demodulation. In this paper, loading several different jamming pattern to different digital communication modulation system models, the bit error rate(BER) under different conditions of jamming signal ratio(JSR) was in statistics through a large number of statistical simulation, the graph is giving to illustrate the comparative relationship of JSR and BER, the comparative Analysis under different channel jamming pattern is giving to illustrate the influence for different digital communication systems.

关键词： Jamming Modulation Digital communication Analytical models Receivers Rayleigh channels Lead

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Efficient collision attacks on smart card implementations of masked AES

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science China(information sciences) 2015年第5期58卷 97-111页

作者： WANG An WANG ZongYue ZHENG XueXin WANG XiaoMei CHEN Man ZHANG GuoShuang WU LiJi Institute of Microelectronics Tsinghua University Key Laboratory of Cryptologic Technology and Information Security Ministry of EducationShandong University China Academy of Electronics and Information Technology School of Computer and Communication Engineering University of Science and TechnologyBeijing Science and Technology on Communication Security Laboratory

Collision attack is often employed against some cryptographic algorithms such as AES and *** a usual countermeasure, masking can resist such attacks to some extent. In CHES 2011, Clavier et *** a collision-correlation attack based on Pearson correlation coefficient against masking. In this paper, a collision distinguisher based on least absolute deviation against masking is proposed. Subsequently, we suggest three other distinguishers based on least square method, least exponent method, and central moment product,respectively. Our experiments and simulations show that in practice, our distinguishers based on least absolute deviation and least square method perform much better than collision-correlation attack and other proposed distinguishers in this paper. We also give four application examples, which show that even if the masks are not reused, new distinguishers are competent to collision attacks.

关键词： power analysis attack collision attack least absolute deviation least square method masking

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Observer-based controller Synthesis for T-S Fuzzy Systems under Imperfect Premise Matching

Observer-based Controller Synthesis for T-S Fuzzy Systems un...

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第28届中国控制与决策会议

作者： Jie Zhou Tao Zhao Science and Technology on Communication Security Laboratory School of Electrical Engineering and Information Sichuan University

ISBN: (纸本)9781467397155

This study focuses on observer-based controller synthesis for T-S fuzzy systems under imperfect premise *** fuzzy observer and fuzzy controller do not share the same membership functions and rules number with the T-S fuzzy *** is to say,the membership functions and rules number of the fuzzy observer and fuzzy controller can be chosen freely,which can enhance robustness and *** Lyapunov stability theory and some inequality techniques,the existence conditions of the fuzzy observer and fuzzy controller are formulated in the form of linear matrix inequalities(LMIs).A numerical example is provided to demonstrate the effectiveness of the proposed approach.

关键词： T-S Fuzzy Systems Linear Matrix Inequalities Fuzzy Observer

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INTELLIGENT information NETWORK security AND MANAGEMENT

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China communications 2016年第7期13卷 3-6页

作者： Yixian Yang Zhongshan Zhang Wenjing Li Information Security Center(ISC) Beijing University of Posts and Telecommunications(BUPT) National Engineering Laboratory for Disaster Backup and Recovery the School of Computer and Communication Engineering in the University of Science and Technology Beijing(USTB) State Key Lab of Networking and Switching Technologies Network Management Research Center at BUPT National Innovation Research Group of China

Intelligent information Network security and Management(IINSM)is an emerging direction in future Internet architecture research,which has gained significant tractions among academia and *** the rapid development of modern society,intelligent information network with the computer as the core technology is widely used in every aspect of social ***

关键词： DCT INTELLIGENT information NETWORK security AND MANAGEMENT Simulation DWT DCNN

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Triple-bit quantization with asymmetric distance for nearest neighbor search 1

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17th Pacific-Rim Conference on Multimedia, PCM 2016

作者： Deng, Han Xie, Hongtao Ma, Wei Dai, Qiong Chen, Jianjun Lu, Ming National Engineering Laboratory for Information Security Technologies Institute of Information Engineering Chinese Academy of Sciences Beijing China School of Computer and Communication Engineering Changsha University of Science and Technology Changsha China School of Information Engineering HeNan Radio and Television University Zhengzhou China

ISBN: (数字)9783319488967

ISBN: (纸本)9783319488950

Binary embedding is an effective way for nearest neighbor (NN) search as binary code is storage efficient and fast to compute. It tries to convert real-value signatures into binary codes while preserving similarity of the original data, and most binary embedding methods quantize each projected dimension to one bit (presented as 0/1). As a consequence, it greatly decreases the discriminability of original signatures. In this paper, we first propose a novel quantization strategy triple-bit quantization (TBQ) to solve the problem by assigning 3-bit to each dimension. Then, asymmetric distance (AD) algorithm is applied to re-rank candidates obtained from hamming space for the final nearest neighbors. For simplicity, we call the framework triple-bit quantization with asymmetric distance (TBAD). The inherence of TBAD is combining the best of binary codes and real-value signatures to get nearest neighbors quickly and concisely. Moreover, TBAD is applicable to a wide variety of embedding techniques. Experimental comparisons on BIGANN set show that the proposed method can achieve remarkable improvement in query accuracy compared to original binary embedding methods. © Springer International Publishing AG 2016.

关键词： Nearest neighbor search

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Co-saliency Detection for RGBD Images Based on Multi-constraint Feature Matching and Cross Label Propagation

arXiv

引用

arXiv 2017年

作者： Cong, Runmin Lei, Jianjun Fu, Huazhu Huang, Qingming Cao, Xiaochun Hou, Chunping School of Electrical and Information Engineering Tianjin University Tianjin300072 China Ocular Imaging Department Institute for Infocomm Research Agency for Science Technology and Research Singapore School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing100093 China

Co-saliency detection aims at extracting the common salient regions from an image group containing two or more relevant images. It is a newly emerging topic in computer vision community. Different from the most existing co-saliency methods focusing on RGB images, this paper proposes a novel co-saliency detection model for RGBD images, which utilizes the depth information to enhance identification of co-saliency. First, the intra saliency map for each image is generated by the single image saliency model, while the inter saliency map is calculated based on the multi-constraint feature matching, which represents the constraint relationship among multiple images. Then, the optimization scheme, namely Cross Label Propagation (CLP), is used to refine the intra and inter saliency maps in a cross way. Finally, all the original and optimized saliency maps are integrated to generate the final co-saliency result. The proposed method introduces the depth information and multi-constraint feature matching to improve the performance of co-saliency detection. Moreover, the proposed method can effectively exploit any existing single image saliency model to work well in co-saliency scenarios. Experiments on two RGBD co-saliency datasets demonstrate the effectiveness of our proposed model. Copyright © 2017, The Authors. All rights reserved.

关键词： Image enhancement

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