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2016 International Conference on communications, Information Management and network Security (CIMNS2016)

作者： Yuanyuan Yang Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry's Engineering Research Center of Ubiquitous Network and Heath Service Jiangsu Province's Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781510830981

In this paper, we propose a two-stage PCA algorithm to deal with the problem of target appearance changes in object tracking. Our method is based on particle filter framework and aims at building up a robust appearance model for the target. In the first-stage, PCA is applied on several templates collected before tracking to construct a low dimensional subspace for the targets. Correspondingly, in the later tracking, all particles will be projected into this subspace to calculate the weight of particles, as well as the location of the target by weighted sum of particles. In the second-stage, PCA is adopted to decompose the reconstruction error into orthogonal basis to find the basis with biggest variance which can best present the appearance changes. Correspondingly, we uses this basis to update the old subspace. Besides, a threshold is set to decide when to update which greatly reduce the numbers of update. The two stages work together to establish a robust appearance model making our tracking algorithm more robust. Experimental results on public video sequence demonstrate the effectiveness of our proposed algorithm.

关键词： particle filter two-stage PCA eigenspace reconstruction error

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Effective Scheme for Global Abnormal Event Detection for Surveillance Video

Effective Scheme for Global Abnormal Event Detection for Sur...

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2016 International Conference on communications, Information Management and network Security (CIMNS2016)

作者： Fangxu Dong Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry's Engineering Research Center of Ubiquitous Network and Heath Service Jiangsu Province's Key Lab of Image Processing and Image Communications Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781510830981

An effective algorithm for global abnormal detection from surveillance video is proposed in this paper. The algorithm is based on sparse representation. To deal with the illumination change in video scenes, specific feature extract methods are designed for corresponding illumination conditions. In the case of non-uniform illumination, features are extracted directly on the original image;in the case of uniform illumination, features are extracted on the binary image obtained by threshold segmentation on the difference image, where the thresholds are computed by the Otsu's method. The features extracted on normal video are used to learn an over-complete dictionary. Then, the sparse reconstruction cost over the dictionary is used to detect abnormal events. Experiments on the open global abnormal dataset and the comparison to the state-of-the-art methods validate effectiveness and quickness of our algorithm.

关键词： abnormal detection illumination change binary images sparse reconstruction cost

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Blind spot coverage strategy based on D2D communications for electric LTE network

Blind spot coverage strategy based on D2D communications for...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Jiming Yao Tao Wang Xiao Wu Lei Wang Baoyu Zheng Global Energy Interconnection Research institute Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology (NUPT) Nanjing China

ISBN: (纸本)9781509028610

With the development of smart of grid, the traditional wireless communication cannot meet the new service requirement. In this paper, we propose a blind spots coverage based on D2D communication scheme to solve the problems of blind spots coverage and service access imbalance for power LTE private network. Meanwhile, we analyze the application of D2D communication technology based on LTE in power grid. In addition, we introduce the type of power LTE private network, discuss the mode of D2D communication in different scenarios between intra-frequency network and differ-frequency network, and explore the typical application scenarios of D2D technology in power grid. We also find that there still remains several open issues in application of D2D technology for the electric power industry.

关键词： Device-to-device communication Long Term Evolution Base stations Power systems wireless communication Bandwidth Cellular networks

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A pitch state dependent dictionary design method for single-channel speech separation

A pitch state dependent dictionary design method for single-...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Haiyan Guo Zhen Yang Linghua Zhang Lei Ye School of Information Science and Engineering Southeast University Nanjing China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education) Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781509028610

In this paper, we propose to design a new pitch state dependent dictionary to perform single-channel speech separation. The dictionary is designed in two stages, which are sub-dictionary learning and sub-dictionary concatenation. In sub-dictionary learning, pitch state information is taken into account to learn a set of discriminative sub-dictionaries for each speaker in time-domain. To be specific, each sub-dictionary is generated as a matrix composed of the speaker's training frames of similar pitch states as columns. Moreover, we utilize a frequent pattern mining method to further reduce the sub-dictionary size. In sub-dictionary concatenation, we propose to select an appropriate weight pair to match the learned sub-dictionaries to generate a dictionary for separation. Experimental results show that the proposed method achieves better overall performance than two dictionary-based methods and a source-filter-based method also using pitch information.

关键词： speech processing Speech processing Dictionaries as Topic Loudspeakers PITCHES pitch design approach channel separation single-channel

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A novel saliency detection model based on curvelet transform

A novel saliency detection model based on curvelet transform

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Peiqing Bai Ziguan Cui Zongliang Gan Guijin Tang Feng Liu Image Processing & Image Communication Lab Nanjing University of Posts & Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts & Telecommunications Nanjing China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China

ISBN: (纸本)9781509028610

Visually salient object or region detection in images is an active research field in recent years. Inspired by that curvelets can provide multi-scale sparse representation of objects with edges and textures, in this paper, we propose a novel saliency detection model based on fast discrete curvelet transform (SDCT) to detect more compact salient objects in an image. First, fast discrete curvelet transform is used to acquire multi-scale representation of feature maps in CIElab.color space. Then the feature maps are transformed to feature salient maps based on dissimilarity measure between patches in a global manner. Finally, the complementary feature salient maps at each scale and each color channel are merged linearly to obtain unitary saliency map. Experimental results on MSRA saliency benchmark database show that the proposed SDCT model outperforms the most state-of-the-art saliency detection models in spatial and frequency domain with higher overall performance, especially acquires more compact salient object and suppresses background saliency effectively, which is desirable for many computer vision applications.

关键词： Transforms Feature extraction Image color analysis Frequency-domain analysis Computational modeling Visualization Image edge detection

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An improved flooding protocol based on network coding

An improved flooding protocol based on network coding

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International Conference on Information technology and Computer Application Engineering, ITCAE 2014

作者： Zhang, Li Na Zhang, Deng Yin Ji, Ying Tian Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

ISBN: (纸本)9781138027176

network coding allows network node to process data by the traditional method of data forwarding, which can effectively improve network throughput, robustness and reliability. In this paper, we propose an improved flooding protocol NCFD (network coding of flooding), which combines network coding technology with flooding protocol, adopting linear network coding technology based on multipath propagation. Computer simulation results show that NCFD could significantly reduce network energy consumption and data redundancy. © 2015 Taylor & Francis Group, London.

关键词： network coding

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Direct measurement of the concurrence for two-qubit electron spin entangled pure state based on charge detection

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Chinese Physics B 2015年第7期24卷 125-129页

作者：刘炯周澜盛宇波 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Physics Nanjing University of Posts and Telecommunications

We propose a protocol for directly measuring the concurrence of a two-qubit electronic pure entangled state. To complete this task, we first design a parity-check measurement（PCM） which is constructed by two polarization beam splitters（PBSs） and a charge detector. By using the PCM for three rounds, we can achieve the concurrence by calculating the total probability of picking up the odd parity states from the initial states. Since the conduction electron may be a good candidate for the realization of quantum computation, this protocol may be useful in future solid quantum computation.

关键词： quantum computation parity check measurement entanglement

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Fast multi-copy entanglement purification with linear optics

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Chinese Physics B 2015年第12期24卷 232-237页

作者：蔡春周澜盛宇波 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Physics Nanjing University of Posts and Telecommunications

We describe an entanglement purification protocol for a polarization Bell state. Different from the previous protocols,it does not require the controlled-not gate, and only uses linear optical elements to complete the task. This protocol requires multi-copy degraded mixed states, which can make this protocol obtain a high fidelity in one purification step. It can also be extended to purify the multi-photon Greenberger–Horne–Zeilinger（GHZ） state. This protocol may be useful in future long-distance communication.

关键词： quantum computation entanglement purification entanglement

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Channel measurement and modeling for the 15-GHz radio band in an indoor corridor environment

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Journal of communications and Information networks 2016年第2期1卷 102-108页

作者： XU Hui ZHANG Wuxiong YANG Yang Key Lab of Wireless Sensor Network and Communication Chinese Academy of SciencesShanghai 200050China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Shanghai Research Center for Wireless Communications Shanghai 201210China

Traditional mobile communication systems mainly work on the licensed frequency band near or below 3 GHz;however,this band is becoming increasingly *** the other hand,there are abundant unlicensed spectrum resources in higher frequency bands,e.g.,6 GHz,15 GHz,and 28 GHz,and if those bands are applied,the current spectrum shortage problem could be effectively ***,the wireless channel characteristics and models are important but still unknown,and thus in this study,extensive measurements and modeling have been conducted to study the characteristics of the high-frequency 15-GHz ***,a PN(Pseudo Noise)sequence based time-domain measurement system was built and applied to measure the propagation characteristics of the LOS(Line-of-Sight)and NLOS(Non-Line-of-Sight)scenarios in an indoor corridor at 15 ***,in-depth analysis and modeling on the large-scale characteristics of wireless channels,the relationship between distance and path loss,the path loss exponent,and the shadow fading standard variance are ***,the relationship between received power and different elevation angles was *** the measurement,two 25-dBi horn antennas with a 10 half-power beam width are used to change elevation angles in the transmitting terminal and azimuth angles in the receiving terminal for all measurement *** findings and results in this work will serve as a reference and basis for future theoretical studies of the 15-GHz band.

关键词： 5G mobile network 15 GHz high frequency channel measurement channel modeling

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Invisible cloak fails: CSI-based passive human detection 1

Invisible cloak fails: CSI-based passive human detection

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1st ACM Workshop on Context Sensing and Activity Recognition, CSAR 2015

作者： Xiao, Fu Xie, Xiaohui Zhu, Hai Sun, Lijuan Wang, Ruchuan School of Computer Nanjing University of Posts and Telecommunications China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks China Key Lab of Broadband Wireless Communication and Sensor Network Technology China

ISBN: (纸本)9781450338424

WiFi signals have attracted extensive attention for context-aware due to its ubiquity. Traditional WiFi sensing methods mainly adopt Received Signal Strength Indication (RSSI), however the coarse features hamper its expansion. To achieve more finger-grained information, Channel State Information (CSI) is introduced for sensing, based on which, we design a directional human detection scheme via data prediction, which aims to visualize the variations of CSI when human appears. However, this scheme suffers from the limitations caused by the link-centric architecture of WiFi. Considering the demands for omnidirectional coverage of some scenarios (e.g. museum exhibition), we propose a omni-directional detection scheme based on fingerprinting utilizing the relationship between the CSI signal features and locations. Experiments are processed in actual scenarios and experimental results verify the feasibility of our two schemes. © 2015 ACM.

关键词： Channel state information

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