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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Yilun Zhang Zongliang Gan Xiuchang Zhu Mingming Cao Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

ISBN: (纸本)9781467321969

In this paper, a novel video back projection super- resolution method using non-local prior is proposed. Our approach has three steps. First, we make initial motion estimation with block-matching and fine block matching to search for the pixels with similar structural content from video sequences. In this process, an adaptive technique is introduced to avoid redundant search. Second, we do initial interpolation to the input video sequences and a bilateral filtering is applied to the interpolation frames to achieve edge-preserving image smoothing. Third, a video non-local means filter is applied to modify the error image in iteration step of the iterative back projection. The experimental result shows that the proposed method can increase image details, moreover, the chessboard effect and ringing effect along image edges can be removed and sharp and clear edges in visual perception will be obtained.

关键词： non-lcoal back projection video motion estimation super-resolution

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Novel Colorization Method Based on Correlation Neighborhood Similarity Pixels Priori

Novel Colorization Method Based on Correlation Neighborhood ...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Huanjuan Wang Zongliang Gan Yanbin Zhang Xiuchang Zhu Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

ISBN: (纸本)9781467321969

Colorization is a computer-aided process of automatically adding colors to grayscale images or videos according to the colors scribbled on by the user. In this paper, we propose a novel colorization method which based on correlation neighborhood similarity pixels priori. First, according to a key observation that similar intensities neighboring pixels have similar colors, our method searches the similarity neighborhood pixels group. Then, we compute the weighted coefficients of the neighborhood pixels in the luminance image and transmit the weighted coefficients to the chrominance. Finally, we obtain the chrominance values by solving a quadratic optimization problem which uses the colors scribbled on by the user as the linear constraints. The experimental results show that our approach is quite effective especially in the boundary parts. Moreover, our method can give better visually results when only a few colors scribbled on.

关键词： colorization optimization neighborhood similarity pixel joint correlation

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Adaptive Resource Allocation Method over OFDMA System for H.264 SVC Transmission

Adaptive Resource Allocation Method over OFDMA System for H....

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Qikun Zhao Lina Qi Zongliang Gan Hongbo Zhu Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

ISBN: (纸本)9781467321969

This paper combines adaptive sub-carriers allocation, power allocation in OFDMA with the transmission of the H.264 SVC (Scalable Video Coding) encoded video sequences in order to support more user and provide better quality of service (Qos) to the subscribers. Firstly we compute the maximum number of users the system can support by our proposed CAC (call admission control), and then our proposed adaptive resource allocation algorithm is utilized to allocate resource to these users On the premise of meeting the most basic requirements of all the users, our proposed scheme can select appropriate resolution adaptively for users according to the channel information. Experimental results demonstrate that our scheme performs better than systems with a fixed resource allocation strategy.

关键词： OFMDA H.264 Adaptive Resource Allocation

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The Spectrum Allocation of Primary user Based on Bayesian Game

The Spectrum Allocation of Primary user Based on Bayesian Ga...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Zhiqiang Fang Lina Qi Zhongliang Gan Hongbo Zhu Qikun Zhao Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

ISBN: (纸本)9781467321969

In cognitive radio system, the Cournot game model is used for analyzing the spectrum allocation of primary users. Considering the noise is random, the spectrum allocation of primary user based on Bayesian game is proposed in this paper. First, the transmit power is viewed as one factor of the cost function. And considering the noise is uncertain, the high noise and the low noise are viewed as two different types of primary users. Then, we can obtain the strategy of primary user by using dynamic Bayesian game. The experimental results on spectrum allocation demonstrate the effectiveness of the proposed scheme.

关键词： cognitive radio Bayesian game spectrum allocation channel noise

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Intrusion detection technology of layered wireless sensor network based on Agent

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Telkomnika - Indonesian Journal of Electrical Engineering 2013年第8期11卷 4238-4243页

作者： Yu, Genjian Weng, Kunpeng Department of Computer Science Minjiang University Fuzhou 350108 China Institute of Communications Technology Fuchun Comminucations Co. Ltd Fuzhou 350108 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education 210003 China

The intrusion detection system and technology of classified layered-wireless sensor network was able to meet the high safety requirements of wireless sensor network, it is urgent for us to improve the identification and generalization of detection system about characters of intrusion. In this paper, we design an intelligent intrusion detection system which realizes intelligence, the effective and direct way was to add the methods, and it was used for identification and generalization of intrusion characters to the Agent function of intrusion detection. It could obtain credible judgment by updating and examining the database for the actions which the general misuse detection or anomaly detection was not sure if the intrusion was formed. © 2013 Universitas Ahmad Dahlan.

关键词： Intrusion detection

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Wideband DOA estimation based on block FOCUSS with limited samples

Wideband DOA estimation based on block FOCUSS with limited s...

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IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Jiawei Zhang Nan Hu Ming Bao Xiaodong Li Wei He Lab of Communication Acoustics Chinese Academy of Sciences Beijing China Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei China Key Laboratory of Wireless Sensor Network & Communication Chinese Academy of Sciences Shanghai China

Whittaker-Shannon interpolation formula instead of narrowband filter (NF) is used to interpolate the signal more precisely in wideband direction-of-arrival (DOA) estimation problem when the number of samples is highly limited. A novel algorithm named block FOCal Underdetermined System Solver (BFOCUSS) is proposed to solve this problem. The simulation results validate the superior performance compared with the other algorithms.

关键词： Direction-of-arrival estimation Estimation Wideband Interpolation Vectors Signal reconstruction Arrays

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Modeling and analysis of anti-worm in P2P networks

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The Journal of China Universities of Posts and Telecommunications 2012年第1期19卷 112-118页

作者： TANG Xin WANG Ru-chuan SHAO Xing College of computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology N anjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

Anti-worm is an effective way to fight against malicious worm and has been followed closely by malicious worm researchers recently. However, active and passive confronting technologies in peer-to-peer （P2P） networks have not been studied in depth. This paper introduces both of them to fight against malicious worm in P2P networks. To study their effectiveness in P2P networks, this paper takes the topology degree in P2P networks into consideration and puts forward a four-state propagation model for active anti-worm and a five-state propagation model for passive anti-worm respectively. Both of the models are simplified in the case that size of a P2P network is large enough. The simulation results have not only validated the effectiveness of our propagation models but also evaluated the excellent performance of both active anti-worm and passive anti-worm.

关键词： P2P network anti-worm worm propagation model

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Optimal power allocation and relay selection for cognitive two-way af relaying network

Optimal power allocation and relay selection for cognitive t...

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IET International Conference on Information Science and Control Engineering 2012, ICISCE 2012

作者： Luo, Ronghua Yang, Zhen Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications China

ISBN: (纸本)9781849196413

In an underlay cognitive two-way Amplify-and-Forward (AF) relaying network, secondary users (SUS) and primary user (PU) can share the licensed spectrum simultaneously under the interference threshold constraint. In this paper, the joint power allocation and optimal relay selection scheme is proposed for allocating radio resource on cognitive nodes effectively. For power allocation problem, the objective function is to maximize the achieved minimum Signal to Interference plus Noise Ratio (SINR) at SUS, and the constraints include the total transmit power of cognitive nodes and PU interference threshold, the optimal power allocation algorithm and a simple distributed power allocation algorithm are proposed. Furthermore, based on these results, an optimal two-way relay selection scheme is proposed. Simulation results show that the proposed joint power allocation algorithms and relay selection scheme can achieve excellent system performance.

关键词： Signal to noise ratio

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Super-resolution algorithm through Neighbor embedding with new feature selection and example training

Super-resolution algorithm through Neighbor embedding with n...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Mingming Cao Zongliang Gan Xiuchang Zhu Key Lab of "Broadband Wireless Communication and Sensor Network Technology" Ministry of Education College of telecommunication and information engineering Nanjing University of posts and telecommunications

ISBN: (纸本)9781467321969

An improved super-resolution algorithm through neighbor embedding with new feature selection and example training is proposed for single image super resolution reconstruction. Firstly, we take the DCT coefficients as the feature vectors, and then adaptively choose neighbors by k-means clustering algorithm. Finally, we learn the neighborhood relationship between interpolated image from low resolution image and its corresponding high resolution image. The experimental results show that the improved algorithm can not only achieve a better recovery of a single low resolution image comparing with the original neighbor embedding algorithm, but also reduce the computational complexity.

关键词： super-resolution neighbor embedding DCT coefficients K-means clustering

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PERFORMANCE ANALYSIS OF USER FAIR-BASED RELAY ADAPTIVE POWER ALLOCATION IN PHYSICAL-LAYER network CODING COOPERATION

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Journal of Electronics(China) 2012年第5期29卷 383-391页

作者： Cheng Yulun Yang Longxiang Wireless Communications Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

network Coding (NC) is an effective technology to enhance the cooperative system spectral efficiency. However, since it is network-oriented, the existing performance metric of single-user outage can not comprehensively evaluate its gain and the impact to the entire network, which affect the user fairness. This paper proposes two novel user fair-based adaptive relay power allocation algorithms in single-relay NC cooperative multiple access channels. Firstly, common outage probability is employed as the performance metric, and to minimize it, a specific condition is deduced. On this basis, the instantaneous channel information-based adaptive relay power allocation scheme and the channel statistic information-based one with lower complexity are designed respectively, which make users' signals superimposed at accurately calculated proportion to maintain fairness. Simulation results show that compared with other existing schemes, the proposed schemes can best maintain user fairness, and effectively improve the common outage performance of the whole system, at the expense of small spectral efficiency.

关键词： Power allocation Cooperation network Coding (NC) Common outage probability User fairness

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