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IEEE International Symposium on Electromagnetic Compatibility (EMC-beijing)

作者： Chenwei Cai Weijun Hong Li Deng Shufang Li Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing People's Republic of China

RFID tag antennas use balanced feeding structure, which causes great challenge on antenna impedance measurement. Methods for balanced antenna impedance measurement can be divided into three categories: Balun method, imaging theory and S-parameter method. Three types methods are analyzed and compared in this paper. Simulations and experiments are implemented to support the comparison. Through the comparisons, great agreements in impedance value and variation tendency are observed between the simulation and experiment. Moreover, strengths and weaknesses of the three methods also are analyzed in this paper.

关键词： Antenna measurements Impedance Scattering parameters Dipole antennas Impedance measurement Imaging

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A SOFTWARE DEFINED SECURITY architecture FOR SDN-BASED 5G network 5

A SOFTWARE DEFINED SECURITY ARCHITECTURE FOR SDN-BASED 5G NE...

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2016 5th IEEE International Conference on network Infrastructure and Digital Content(IC-NIDC 2016)

作者： Xiaodong Liang Xiaofeng Qiu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509012473

Software Defined networking(SDN) is considered to meet the future needs of the 5G mobile ***,there have been only a few works so far that address the security issues in SDMN(Software Defined Mobile networks),and all the proposed approaches have their ***,in this context,a new security paradigm based on SDN introduces many opportunities and provides the potential to solve the security problem in the mobile core *** this paper,we present the SDS-SC,a software defined security architecture for SDN based 5G *** centralized security controller that communicates with SDN network controller,flexible and network-aware security services could be provided for mobile users *** also highlight how security applications could be developed easily in our architecture through application interface on top of the security controller.

关键词： 5G SDN Security architecture

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network ANOMALY DETECTION BASED ON FREQUENT SUB-GRAPH MINING APPROACH AND ASSOCIATION ANALYSIS 5

NETWORK ANOMALY DETECTION BASED ON FREQUENT SUB-GRAPH MINING...

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2016 5th IEEE International Conference on network Infrastructure and Digital Content(IC-NIDC 2016)

作者： Fangyuan Cheng Xiaofeng Qiu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781509012473

In this paper,an anomaly detection method based on frequent sub-graph mining and association analysis is introduced to ensure the security of the *** this method,the network behavior data in SDN are represented as a graph,abnormal sub-graphs of which are readily *** patterns of the detected abnormal behaviors are able to be ***,an ensemble method based on Bagging algorithm is proposed to improve the detection *** with global flow table data based on SDN indicated that this approach was capable of detecting anomalies in ***,to illustrate the effectiveness of this method in other aspects,comparisons with KDD99 data set were *** the results verified its excellent ability in reducing false alarms and the effect of the ensemble method on improving the detection accuracy.

关键词： Security for SDN Anomaly detection Frequent sub-graph mining Bagging ensemble method

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Signal Recognition Based on Signal Power Spectrum Fitting Feature Extraction

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beijing Youdian Daxue Xuebao/Journal of beijing University of Posts and Telecommunications 2018年第2期41卷 114-118页

作者： Tian, Hao-Min Yin, Liang Ma, Yue Li, Shu-Fang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China Computer Network Research Center Beijing University of Posts and Telecommunications Beijing100876 China School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing100876 China

Aiming at the problem of communication signal service type identification, the author proposes a polynomial fitting factor that extracts the power spectrum of the signal using the linear regression algorithm and the polynomial fitting model in machine learning field as a unified feature of the signal to construct the training set. A multi-layer fully connected neural network classifier model was built on depth learning platform. Compared with the traditional ones, this method has advantages of unifying the radio signal without the need of individual service to extract the personalized features. The power spectrum data of code division multiple access(CDMA) uplink, CDMA downlink, extended global system for mobile(EGSM) uplink, EGSM downlink, wireless local area networks (WLAN) and long time evolution (LTE) signals in the actual radio monitoring data are selected as data set, and 97% classification accuracy is verified. that this method is proven feasible. © 2018, Editorial Department of Journal of beijing University of Posts and Telecommunications. All right reserved.

关键词： Extraction

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Probabilistic Top-k Query:Model and Application on Web Traffic Analysis

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China Communications 2016年第6期13卷 123-137页

作者： Xiaolin Gui Jun Liu Qiujian Lv Chao Dong Zhenming Lei Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and TelecommunicationsBeijing100876China Agricultural Bank of China Beijing 100161 China

Top-k ranking of websites according to traffic volume is important for Internet Service Providers(ISPs) to understand network status and optimize network resources. However, the ranking result always has a big deviation with actual rank for the existence of unknown web traffic, which cannot be identified accurately under current techniques. In this paper, we introduce a novel method to approximate the actual rank. This method associates unknown web traffic with websites according to statistical probabilities. Then, we construct a probabilistic top-k query model to rank websites. We conduct several experiments by using real HTTP traffic traces collected from a commercial ISP covering an entire city in northern China. Experimental results show that the proposed techniques can reduce the deviation existing between the ground truth and the ranking results vastly. In addition, we find that the websites providing video service have higher ratio of unknown IP as well as higher ratio of unknown traffic than the websites providing text web page service. Specifically, we find that the top-3 video websites have more than 90% of unknown web traffic. All these findings are helpful for ISPs understanding network status and deploying Content Distributed network(CDN).

关键词： top-k query traffic model temporal bipartite graph uncertain data unknown traffic

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Distribution network topology reconstruction method based on lasso and its supplementary criterions 10th

Distribution network topology reconstruction method based on...

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10th International Conference on Security, Privacy and Anonymity in Computation, Communication and Storage, SpaCCS 2017

作者： Li, Xiaoyu Li, Shufang Li, Wenqi Tian, Shiming Pan, Mingming Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China State Grid Henan Electric Power Company Jinshui District Zhengzhou450052 China China Electric Power Research Institute Haidian District Beijing100192 China

ISBN: (纸本)9783319723945

In order to solve the problem of topology reconstruction in distribution network, a new data driven algorithm is proposed, which uses only the timing voltage to reconstruct the un-loopy and loopy distribution network topology without the prior knowledge. Firstly, the topology reconstruction problem is transformed into a convex optimization problem, and the Lasso regularization method is utilized to obtain a sparse correlation coefficient matrix (CCM), which represents the connectivity of the topology. Secondly, the "And" rule is employed to reduce the redundancy of CCM. And then the criterion of the voltage correlation analysis model is adopted as a supplemental criterion to reduce the error rate of CCM. Finally, the topology reconstruction of the distribution network is realized based on the accurate CCM. Simulation results show that the algorithm has high accuracy, universality and low computational complexity. © Springer International Publishing AG 2017.

关键词： Convex optimization

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Dual-layer efficiency enhancement for future passive optical network

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Science China(Information Sciences) 2016年第2期59卷 172-184页

作者： Yuefeng JI Xiaoxiong WANG Shizong ZHANG Rentao GU Tonglu GUO Zhaozhi GE State Key Lab of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications

Ever-increasing demands on bandwidth compel us to improve the bandwidth utilization of access networks. It is more important to enhance the efficiency of passive optical networks(PON) than other access technologies, as they are the primary solutions to various access scenarios. To satisfy the demands of improved bandwidth efficiency, we propose a dual-layer(data link layer and network layer) efficiency enhancement scheme for future PON system. Under this architecture, a data-link-layer flexible coding scheme is introduced to extend the downstream link throughput, and a network-layer centralized active queue management(AQM) scheme is introduced to increase bandwidth efficiency. Both of these technologies are designed to suit the future centralized cooperative control mode. The results of an experimental demonstration of the network coding PON scheme reveal the efficiency of the proposed architecture. The results of simulations show that the centralized AQM scheme has a positive influence on queuing delay and jitter. To the best of our knowledge, this is the first time that a data link layer mechanism and a network layer policy have been integrated to provide high efficiency and quality of service in access networks.

关键词： passive optical network bandwidth efficiency network coding active queue management centralized control

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Expected Q-learning for Self-Organizing Resource Allocation in LTE-U with Downlink-Uplink Decoupling

Expected Q-learning for Self-Organizing Resource Allocation ...

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European Wireless 2017;23th European Wireless Conference

作者： Ye Hu Richard MacKenzie Mo Hao Beijing Laboratory of Advanced Information Network Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications BT TSO Tsinghua SEM Advanced ICT Lab

ISBN: (纸本)9781509038442

Exponentially growing demand on mobile data facilitates the need to increase spectrum efficiency and also to gain access to additional spectrum bands. LTE-U provides a way for LTE service to be provided, in some regulatory areas, using a combination of licensed and unlicensed spectrum. In this paper, we consider the resource allocation problem in LTE-U networks with downlink-uplink decoupling (DUDe) technique. Here, the spectrum allocation problem is formulated as a game theoretic model which incorporates user association, spectrum allocation, and load balancing. We propose a decentralized expected Q-learning algorithm to solve this game. Using the proposed algorithm, the base stations can autonomously choose their optimal spectrum allocation schemes based on only limited information from the networks. It is shown that the proposed algorithm converges to a stationary mixed-strategy distribution which constitutes a mixed strategy Nash equilibrium for the studied game. Simulation results show the proposed Q-learning algorithm yields up to 12.7% and 51.1% improvement in terms of total rate, compared to traditional Q-learning and nearest neighbor algorithms, respectively. Furthermore, it is shown that the proposed Q-learning algorithm always converges to a mixed Nash equilibrium, and need 19% less time to coverage compared to traditional Q-learning.

关键词： Estimation Field programmable gate arrays OFDM Modulation Filtration Clocks Signal processing algorithms

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Zone Coordinates: A New Coordinate system

Zone Coordinates: A New Coordinate System

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2017 17th IEEE International Conference on Communication Technology (ICCT 2017)

作者： Zehua Gao Mingjing Zhu Yuxi Tan School of Information and Communication Engineering Beijing Laboratory of Advanced Information NetworksBeijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Coordinates systems include rectangular coordinate systems, cylindrical coordinate systems, and spherical coordinate systems, among others. In three-dimensional rectangular coordinate systems, "x = 2" defines a plane, "x = 2,y = 3" defines a line, and "x = 2, y = 3, z = 1" defines a ***, traditional coordinates systems are represented by the combination of point, line, and plane. In the real world,every object or field occupies a certain volume, even atoms or protons. We present a new coordinate system, called the zone coordinate system, that gives the position of an entire object or field. The zone coordinate system is more in line with reality. It can be applied in every field that requires a location-based application.

关键词： rectangular coordinate point-line coordinates zone coordinate

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A Dynamic Multiuser Detection Scheme for Uplink SCMA system

A Dynamic Multiuser Detection Scheme for Uplink SCMA System

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2017 17th IEEE International Conference on Communication Technology (ICCT 2017)

作者： Yuxi Tan Zehua Gao Siyan Guo Feng Gao School of Information and Communication Engineering Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

As one of nonorthogonal multiple access techniques for the fifth generation mobile communications, sparse code multiple access（SCMA） can provide a better link performance than other schemes in different network scenarios. However, SCMA employs message passing algorithm（MPA） as its receiver decoding scheme which leads to higher computing complexity and restricts it’s application to low latency networks. Based on this, a dynamic message passing algorithm（DMPA） is presented in this paper for reducing calculation complexity of original MPA. In DMPA, reliability of variable node can be calculated by the pseudo posterior probability after predetermined iterations, and then messages are propagated merely in subgraph of original factor graph which can result in a significant reduction in complexity. Simulation results show that DMPA can reduce decoding complexity about 37% than MPA with negligible bit error rate（BER） degradation.

关键词： SCMA（Sparse Code Multiple Access） MPA（Message Passing Algorithm） BER（Bit error rate） complexity

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