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2013 IEEE 4th International Conference on Software engineering and Service Science

作者： Xiaolong Ye Julong Lan Wanwei Huang Department of National Digital Switching System Engineering Technological R＆D Center

ISBN: (纸本)9781467349970

Since traditional abnormal detection methods have poor performance,and Hurst parameter estimation was affected by non-stationary *** abnormal detection method based on Hurst parameter estimation using Fractional Fourier Transform（FrFT） was *** experimental results show that FrFT estimation method was not affected by nonstationary time series and has better performance on Hurst *** also verify the improvement in the network traffic anomaly detection.

关键词： component self-similarity anomaly detection wavelet FrFT Hurst parameter

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An affinity propagation algorithm base on self-tuning kernel geodesic distance

An affinity propagation algorithm base on self-tuning kernel...

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International Conference on Information Science and technology (ICIST)

作者： Jianpeng Zhang Fucai Chen Lixiong Liu dongdong Niu Department of China National Digital switching System Engineering & Technological R & D Center Zhengzhou Henan

For affinity propagation algorithm, traditional Euclidean distance measure cannot fully reflect the complex spatial distribution of the data sets. We propose a self-tuning kernel geodesic distance as the similarity measure which can reflect the inherent manifold structure information effectively. Meanwhile, according to the neighborhood density of the data sets, it identifies and eliminates the influence of boundary noise effectively, the results show that the improved algorithm has higher accuracy and better robustness for data with manifold distribution, multi-scale and noise overlap.

关键词： Clustering algorithms Manifolds Kernel Noise Level measurement Euclidean distance Algorithm design and analysis

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A cooperative jamming based security algorithm for multi-user MIMO systems

A cooperative jamming based security algorithm for multi-use...

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International Conference on Information Science and technology (ICIST)

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

ISBN: (纸本)9781467327626

The existing physical layer security algorithm could guarantee secure communication to a certain extent. However, eavesdropper can get more information from legitimate receivers whose channel condition is worse than other users. In order to improve the system's security, a novel physical layer security algorithm based on cooperative jamming for multiuser MIMO system is proposed in this paper. Firstly, a multi-user MIMO system of security is established, combining transmit beamforming and artificial noise. Then, the status of each user's characteristics is described respectively. And users are divided into a secure communications group and interference group for scheduling according to the characteristics of the user's state. Further, interference group assists the base station interference eavesdropper by adjusting the beamforming weights. Simulation results show that the proposed algorithm can increase the secrecy capacity by 2.4bit/s/HZ averagely, which can improve security for multi-user MIMO system.

关键词： Interference Security MIMO Signal to noise ratio Joints Array signal processing

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Physical-layer security based on joint scrambling with spatial and frequency resource

Physical-layer security based on joint scrambling with spati...

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International Conference on Information Science and technology (ICIST)

作者： Mingliang Li Kaizhi Huang Zhou Zhong National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

The projection of the random multi-antenna weighted vector structured with spatial scrambling is of constant modulus on the main channel, Eavesdropper can take the advantage of multi-antenna to intercept private information. To solve this problem, we design a kind of physical-layer secrecy method based on the joint scrambling with spatial and frequency resource. Based on the parallel transmission nature of OFdM, we construct a random multiple antenna weighted vector in the each subcarrier, the projection of which on the main channel is equal to a dynamic reference variable. The legitimate user can correctly demodulate the receive signal by this reference variable obtained from the estimation of the reference subcarrier. Meanwhile, because of the difference between the main channel and eavesdropper channel, eavesdropper can't obtain the useful information. The simulation results show that, when the legitimate users can correctly demodulate the received signal, the eavesdropper can't intercept the private information using whether blind equalization or MUSIC-like method.

关键词： Transmitting antennas OFdM Channel estimation Vectors Signal to noise ratio Wireless communication

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Practical on-line near-duplicate detection for web video

Practical on-line near-duplicate detection for web video

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International Conference on Information Science and technology (ICIST)

作者： Wei Bao Lixin Ji Lixiong Liu National Digital switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

This paper proposes an alternative point of view on the use of ordinal measures to detect near-duplicate web videos. Ordinal measure fingerprints are first extracted in the core area of videos, and ordinal measures are fast matched based on Transformation distance, and then an asymmetric technique is used to obtain the longest same sub-sequence and detect video copies. Experimental results show that the method has good robustness and distinctiveness.

关键词： Area measurement Feature extraction robustness Internet Length measurement Algorithm design and analysis Image edge detection

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Audio sensing aid based wireless microphone emulation attacks detection

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第10期11卷 5917-5928页

作者： Shan-Shan, Wang Xing-Guo, Luo Bai-Nan, Li National Digital Switching System Engineering and Technological R and D Center Jinshui Zhengzhou 450001 China

The wireless microphone network is an important PU network for CrN, but there is no effective technology to solve the problem of microphone evaluation attacks. Therefore, this paper propose ASA algorithm, which utilizes three devices to detect MUs, and they are loudspeaker audio sensor (LAS), environment audio sensor (EAS), and radio frequency fingerprint detector (rFFd). LASs are installed near loudspeakers, which have two main effects: One is to sense loudspeakers' output, and the other is to broadcast warning information to all SUs through the common control channel when detecting valid output. EASs are pocket voice captures provided to SU, and utilized to sense loudspeaker sound at SU's location. Utilizing EASs and energy detections in SU can detect primary user emulation attack (PUEA) fast. But to acquire the information of attacked channels, we need explore rFFds to analyze the features of PU transmitters. The results show that the proposed algorithm can detect PUEA well. © 2013 Universitas Ahmad dahlan.

关键词： Loudspeakers

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Adaptive key generation based on quantization of channel characteristics 3rd

Adaptive key generation based on quantization of channel cha...

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International Conference on Information Science and technology (ICIST)

作者： Qiao dai Jin Liang Kaizhi Huang China National Digital Switching System Engineering & Technological R&D Center Zhengzhou PRC

ISBN: (纸本)9781467327626

Length and mismatch rate of secret bit strings derived from channel characteristics by legitimate users for key generation are affected by quantization algorithm significantly. Existing schemes cannot achieve both a string and a low mismatch rate at the same time because of the static quantization method. In this paper we first propose an adaptive quantization algorithm formed of an quantizer offset with the quantization noise at one side and a quantization-level optimizing method, which maximize the length of secret bit string under the constraint of mismatch rate. Based on this algorithm, a key agreement scheme selection approach is presented to harvest longer bit strings. As a result, an adaptive key generation scheme based on quantization of channel characteristics is proposed using the above methods. With this scheme, bit strings with length close to theoretical limit can be generated, and the mismatch rate is lower than 5%.

关键词： Quantization (signal) Entropy Security Bit error rate Upper bound Signal to noise ratio

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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...

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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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Primary User Emulation Attacks Analysis for Cognitive radio Networks Communication

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第7期11卷 3905-3914页

作者： Wang, Shan-Shan Luo, Xing-Guo Li, Bai-Nan National Digital Switching System Engineering Technological R and D Center Jinshui Zhengzhou 450001 China

Cognitive radio Network is an effective technology and a hot research direction which can solve the problem of deficient resource and revolutionize utilization. And its safety technology attracts more and more researches. Primary user emulation attacks (PUEAs) are typically easy and largely affecting. PUEAs come from both malicious misbehavior secondary users (MMUs) and selfish misbehavior secondary users (SMUs). The former is studied much more deeply than the later one. distinguishing MMU and SMU, we propose a Four dimensional Continuous Time Markov Chain model to analyze the communication performance of normal secondary users under PUEAs, and typically affected by SMUs. Furthermore, we compare several PUEA detection schemes. The emulation results indicate that the SMU detection mechanism is essential for the PUEA detection schemes, which can improve the detection effects largely. © 2013 Universitas Ahmad dahlan.

关键词： Cognitive radio

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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...

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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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