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A soft fast estimation method of PN sequence based on weighting Walsh Hadamard Transform

A soft fast estimation method of PN sequence based on weight...

引用

International Conference on Information Science and technology (ICIST)

作者： Kaizhi Huang Song Chen Meiyue Yang National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

Poor error-tolerance and polynomial taps restriction are the main issues of Walsh Hadamard Transform estimation method. This article is devoted to these issues and a novel soft fast PN sequence estimation algorithm based on weighting Walsh Hadamard Transform is proposed. Firstly, the theoretical analysis about error-tolerance likelihood bound of sequence hard-decision and restrictive factor of estimation polynomial taps is performed. Based on the analysis, the sequence soft information is introduced into sequence frequency-coefficient to improve estimation performance, and the Walsh Hadamard matrix is column-weighted to change its binary property, which can decrease the influence of polynomial taps to estimation performance. Meanwhile, the sequence control state is chosen to decrease the estimation polynomial taps in essence. Simulation results illustrate that our proposed method is irrelevant with the order and tap of generation polynomial and can yield a performance gain of more than 1.5dB compared to WHT.

关键词： Polynomials Estimation Vectors Error analysis Transforms Algorithm design and analysis

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Enhancing wireless security with theory of ill-posed problem: A novel physical-layer encryption mechanism

Enhancing wireless security with theory of ill-posed problem...

引用

International Conference on Information Science and technology (ICIST)

作者： Xiangyang Xu Wenyu Luo Huawei Song Lizhi Zhang National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

This paper studies physical-layer security without knowing the eavesdropper's channel state information. The use of ill-posed theory to protect wireless transmissions is proposed. Firstly, the problem of randomized transmission is translated to that of solving ill-posed equation to guarantee wireless transmissions with inherent low-probability-of interception (LPI). Secondly, by exploiting the nonunique or instable solutions of an ill-posed problem, two mechanisms are proposed that satisfy the given security requirement while achieving good throughput performance. Our results show that ill-posed problem is not always nasty. We hope that by identifying ill-posed problem inversely, a theoretical framework of enhancing physical-layer security can be constructed eventually.

关键词： Security Communication system security Wireless communication Vectors Extraterrestrial measurements Signal processing

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A partial CSI based Affinity propagation dynamic clustering algorithm

A partial CSI based Affinity propagation Dynamic clustering ...

引用

International Conference on Information Science and technology (ICIST)

作者： Xiaomin ran Min Tong Youquan Mo National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

The precondition of the whole known channel state information (CSI) is impractical in realistic system. To deal with this problem, a partial CSI based Affinity propagation dynamic clustering algorithm was proposed in this paper. In this algorithm, degree of wiliness to cooperate (dWC) was used to design the input matrix and a cooperation fact was introduced to adjust the number of clusters in clustering results. Assuming every BS has the partial CSI information of the whole system, during each iteration round, responsibility and availability are propagated to accumulate the coordination incidences among BSs. After that, it constructs several clusters of dynamic size. Simulation results show that the capability of this scheme is almost the same as the whole CSI based benefit-tree clustering algorithm. And the convergence iteration rounds increase slowly as the system size enlarging. This exhibits high convergence speed, which is well suited for implementation in realistic system.

关键词： Clustering algorithms Heuristic algorithms Algorithm design and analysis Convergence Collaboration Availability Attenuation

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A polynomial estimation algorithm for PN sequence based on reliability accumulation 3rd

A polynomial estimation algorithm for PN sequence based on r...

引用

International Conference on Information Science and technology (ICIST)

作者： Meiyue Yang Kaizhi Huang Wenyu Luo National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

To solve the problems of current polynomial estimation algorithms for PN sequence, such as insufficient efficiency and error-tolerance, a novel algorithm based on reliability accumulation is proposed combining BM iterative algorithm based on binary sequence with improved Chase algorithm. Using sequence soft information and constructing the sequence and corresponding polynomial reliability outside BM algorithm, polynomial estimation is accomplished by reliability accumulation. Then, the reliability-accumulated polynomial scale is reduced according to the primitive polynomial characteristic on GF(2) field to improve the estimation accuracy. Simulation results show that the method is not restricted by the tap number of polynomial and has a good performance on estimating the 17th order polynomial under the situation of 15% BEr.

关键词： Polynomials Algorithm design and analysis Estimation Fault tolerance Fault tolerant systems Generators

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Analysis and Prevention for Cross-site Scripting Attack Based on Encoding

Analysis and Prevention for Cross-site Scripting Attack Base...

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2013 IEEE 4th International Conference on Electronics Information and Emergency Communication

作者： ding Lan Wu ShuTing Ye Xing Zhang Wei Library of Zhengzhou Teachers College Department of Intelligence and Reconnaissance Zhengzhou Teachers CollegeSpecial Police Academy China National Digital Switching System Engineering &Technological R&D Center Information Engineering University

ISBN: (纸本)9781467349345

With the development of Web application, cross-site scripting attacks have been rapidly increasing, and the technique of those attacks is constantly updating. There has been some special advanced attacks such as the one based on encoding. In this paper we analyze two kinds of those attacks respectively based on the binary and N-ray alphabets encoding, then presents a dynamically access control method to prevent them by means of the existing detection and prevention technology of cross-site scripting attack, making up the existing approach being lack of the practicality, and the experimental results verify the feasibility and practicality of our protection mechanism.

关键词： Cross Site Scripting Attack Web Application Cross- domain Access Encoding Based on N-ary Alphabets

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The community detection algorithm based on transferring the similarity 3rd

The community detection algorithm based on transferring the ...

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International Conference on Information Science and technology (ICIST)

作者： dongdong Niu Hongchang Chen Lixiong Liu China National Digital Switching System Engineering & Technological R & D Center

ISBN: (纸本)9781467327626

For global community detection algorithm having high computation complexity and local community detection algorithm working bad in community quality, in this paper we propose an algorithm by finding the core nodes in different communities first, then use an algorithm based on transferring the similarity we propose in this paper to measure the similarity between core nodes with other nodes. Finally we divide the network by the similarity calculation *** proposed algorithm is tested on both our network and common networks, and is compared with the typical algorithms in community detection. Experimental results verify and confirm the feasibility and validity of the proposed algorithm.

关键词： Communities detection algorithms Algorithm design and analysis Complex networks Clustering algorithms Approximation algorithms dolphins

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A multicarrier-based physical layer security scheme for the multicast systems 3rd

A multicarrier-based physical layer security scheme for the ...

引用

International Conference on Information Science and technology (ICIST)

作者： Tong Lin Kai-Zhi Huang Wen-Yu Luo National Digital Switching System Engineering & Technological R&D Center NDSC Zhengzhou Henan P.R. China

ISBN: (纸本)9781467327626

Traditional physical layer security methods, such as artificial noise, commonly require that the sender has more antennas than that of the receivers, which is not practical in the multicasting system. To solve this problem, a multicarrier-based physical layer security scheme for the multicast systems is proposed, which takes the advantage of both space and frequency domain to form a relatively virtual multi-antenna system. Through subcarrier allocation the existence of null space in every subcarrier channel matrix is guaranteed, so that the artificial noise can be added to ensure a secure communication. Based on the Kuhn-Tucher condition, an optimal power allocation method is also proposed to maximize the security rates under the restriction of total power. Simulation results indicate that this scheme is unlimited by the amount of the sender antennas, and it improves the security rates by 2 bit/s/Hz than the average power allocation method.

关键词： resource management Noise Security Null space Physical layer Base stations Simulation

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An effective community detection algorithm of the social networks

An effective community detection algorithm of the social net...

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International Conference on Information Science and technology (ICIST)

作者： Yuan Huang Wei Hou Xiaowei Li Shaomei Li National Computer Network and Information Security Administration Center Beijing China National Digital Switching System Engineering & Technological R&D Center Zhengzhou

ISBN: (纸本)9781467327626

The traditional social network community detection algorithms generally lack of consideration of link attributes, and full expression using link attribute information model and mechanism. Aiming at this issue, this paper puts forward the community detection algorithm of social network through fusion the link and node attributes. We combine similarity of node attributes between adjacent nodes and link information, and define the similar weights. On this basis, the algorithm realizes community detection of the social network by combining condensation algorithm. Experiments show that effect of this algorithm about social network attribute is remarkable, obviously in attribute-distinct community.

关键词： Communities Social network services Algorithm design and analysis Clustering algorithms detection algorithms Classification algorithms Image edge detection

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Eavesdropping against artificial noise: Hyperplane clustering

Eavesdropping against artificial noise: Hyperplane clusterin...

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International Conference on Information Science and technology (ICIST)

作者： Lu Liu Jin Liang Kaizhi Huang National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC Information Engineering University Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

Wireless secure communication using artificial noise can guarantee security when the transmitter has more antennas than the eavesdropper. Contrarily, this paper considers the problem of eavesdropping when sufficient antennas were equipped. First, we prove that the receiving scrambling signals are distributed within parallel hyperplanes. Second, based on this signal signature, we propose Hyperplane Clustering algorithm (HC) for real-time eavesdropping. The HC algorithm uses parallel hyperplanes in signal space to approximate receiving signal points, extract signal features and thus intercept messages. Simulations show that the HC algorithm has the benefits of lower complexity, and better anti-noise performance, compared with the existing MUSIC-like algorithms.

关键词： Clustering algorithms Noise Bit error rate Transmitting antennas Approximation algorithms Computational complexity Vectors

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A second-order spatial hopping transmission scheme for physical layer security

A second-order spatial hopping transmission scheme for physi...

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International Conference on Information Science and technology (ICIST)

作者： XinSheng Ji XiaoLei Kang KaiZhi Huang KeMing Ma China National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan P.R. China China Nat. Digital Switching Syst. Eng. & Technol. R&D Center Zhengzhou China

ISBN: (纸本)9781467327626

The method of physical layer security in wireless relay communication based on cooperative jamming scheme need the channel of legitimate user keep constant. It fails if the eavesdropper has more antennas than the sender. To solve this problem, this paper proposes a second-order spatial hopping transmission scheme. The sender, by the antenna switching and the hopping spatial pattern (HSP), forms equivalent spatial channel of the first-order; Acting as a virtual multi-antenna receivers, relays use time-varying coefficient of beam-forming to weighted-and-forward, form equivalent spatial channel of the second-order. Simulation results show that the scheme proposed achieves low probability of intercept (LPI) in eavesdropper and the power consumption is lower than the method of cooperative jamming.

关键词： relays Antennas Jamming Switches Security Physical layer Bit error rate

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