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International Symposium on wireless Personal Multimedia communications (WPMC)

作者： Rui Li Zhifeng Wu Ruochen Huang Xin Wei Yi Qian ZTE CORPORATION China Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education China

ISBN: (纸本)9781509053773

This paper proposes an integrated poor-quality model to find the potential relationship between elected STB (set-top boxes) indicators and network conditions. The target is to make the IPTV network fault diagnosis more accurately and efficiently, especially for the sudden pause or blurred screen. The integrated poor-quality model consists of indicator, record and user model. Firstly, the poor-quality indicator model is in charge of selecting the effective indexes from candidate STB indicators. From the result of experiment, we conclude that jitter, abend-number and MLR (media loss rate) are the most important QoS (Quality of Service) parameters in our scenario. Secondly, the poor-quality record model has responsibility for adjustment of threshold values in order to meet the needs of higher accuracy rate with lower misjudgment ratio. Finally, the poor-quality user model takes customer's viewing time parameter into account, which can reflect end user's quality of experience objectively.

关键词： IPTV Quality of service Correlation Jitter Indexes Multimedia communication

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Lihua Gao Haitao Ling Xutong Fan Jianxin Chen Qin Yin Lei Wang China Telecom Co Jiangsu Branch. Key Lab of Broadband Wireless Communication and Sensor Network Technology University of Telecommunications Ministry of Education Nanjing Multimedia Service Product Dept. China Telecom Co Jiangsu Branch Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Telecommunications Ministry of Education

ISBN: (纸本)9781509028610

With the popularity of network, P2P-based Video on Demand (VoD) has become one of the main services in Internet. However, due to the huge amount of videos, how to access the video quickly is important since it affects the subscriber's experience. In this paper, a popularity-driven storing model is proposed to fasten the video discovery for a centralized P2P-VoD system. All videos are stored in a binary tree in the server according to their popularities. Experimental results show that this scheme works well in terms of discovery delay and resource utilization.

关键词： Binary trees Servers Delays Peer-to-peer computing Telecommunications Computational modeling wireless communication

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TA3C: Teaching-Oriented Adaptive Wi-Fi Authorized Access Control Based on CSI

TA3C: Teaching-Oriented Adaptive Wi-Fi Authorized Access Con...

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International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Fu Xiao Jing Chen Xiaohui Xie Lijuan Sun Ruchuan Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Jiangsu China College of Computer Nanjing University of Posts and Telecommunications Jiangsu China

ISBN: (纸本)9781509056972

Wi-Fi has been widely deployed with the rapid development of wireless communication technique. Wi-Fi hotspots are popular in campus, making convenient wireless network access possible. However, during class teaching, in order to avoid students browsing the web based on Wi-Fi hotspots and distracting, we hope Wi-Fi hotspots adaptively shield network access to students in the classroom, while grant access to users outside the classroom. In this work, we prototype TA3C system, a teaching-oriented adaptive Wi-Fi authorized access control scheme, using Channel State Information (CSI) to locate instead of coarse-grained and temporally unstable Received Signal Strength Indication (RSSI). CSI can distinguish multipath signals, stay stable in the same propagation environment, and show different characteristics in different propagation environments, based on which, we can distinguish outdoor and indoor environments, and identify user's location to decide whether to offer him wireless network access or not. Experiment results show that TA3C effectively achieve adaptive Wi-Fi authorized access control, which provides a guarantee for the quality of class teaching. Compared to traditional indoor localization techniques, TA3C does not need accurate location information but simply recognizes user's location indoors or outdoors, which means it does not need dedicated hardware, realizing the low-cost indoor localization technique.

关键词： wireless communication wireless fidelity wireless sensor networks Antennas Fingerprint recognition Correlation coefficient Correlation

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A New BDI Forecasting Model based on Support Vector Machine

A New BDI Forecasting Model based on Support Vector Machine

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2016 IEEE Information technology,networking,Electronic and Automation Control Conference(ITNEC 2016)

作者： Jianmin Bao Lin Pan Yuanfa Xie Key Lab of Broadband Wireless Communication and Sensor Network Technology (Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology) Ministry of Education Baer Institute of Excellence Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781467391955

BDI(Dry Baltic Index) is a barometer of the shipping market, which is very important and difficult to predict precisely. The traditional forecasting method is not enough to predict precisely for it with higher complexity. The support vector machine has strong nonlinear function approximation and strong generalization ability. In this paper, a new BDI forecasting model based on support vector machine combined with CFS(Correlation-based Feature Selection) is presented and we first introduce the macroeconomic fundamental indicators of BDI. Firstly, we studied and researched the main macroeconomic fundamental indicators of BDI, investigate the inherent law and external influence of freight index fluctuation, and then put forward the BDI forecasting model based on support vector machine and demonstrate the construction principle of the forecasting model. Finally, in order to evaluate the predictive power of support vector machines, we compare their performance with the neural network model. The results show that the SVM model has a better performance in both the trend and the forecast precision, which can provide a powerful tool for the shipping market operators and investors to grasp the market trend and avoid the price risk.

关键词： BDI support vector machine feature selection CFS modeling

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A New Fragmentation Strategy for Video of HTTP Live Streaming

A New Fragmentation Strategy for Video of HTTP Live Streamin...

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International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Xiaorui Li Lei Wang Jingwu Cui Baoyu Zheng 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)9781509056972

To achieve the flexible and efficient transmission of files in the video on demand system, this paper proposed a three-tier fragmentation strategy which provided a unfiled method of fragmentation for video of HTTP Live Streaming and large file. In order to prove the rationality of the three-tier fragmentation strategy, we compared it with the two layers fragmentation strategy and the fragmentation strategy of equal time. And the comparisons proved the superiority of three-tier fragmentation strategy.

关键词： Peer-to-peer computing IPTV Packet loss Video on demand Data communication

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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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Design of P2P Application Layer Protocol

Design of P2P Application Layer Protocol

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International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Yujie Ma Lei Wang Jingwu Cui Baoyu Zheng National Mobile Communications Research Laboratory Southeast University Nanjing China Network Technology (NUPT) Key Lab of Broadband Wireless Communication and Sensor Nanjing China

ISBN: (纸本)9781509056972

On the basis of studying the principle and application technology of P2P protocol, we design the private protocol of P2P application layer to meet the needs of P2P communication. This application layer protocol splits up video into three types of blocks in order to improve transmission efficiency. Besides, the protocol can be expanded when needed since there are some invalid bits in the state list.

关键词： Peer-to-peer computing Protocols Streaming media Authentication Servers Sockets Law

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Sleeping-time Analysis for Cognitive OFDM-PON

Sleeping-time Analysis for Cognitive OFDM-PON

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International Conference on wireless communications and Signal Processing

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

ISBN: (纸本)9781509028610

In this paper, we introduce the concept of OFDM-PON, and introduce the best method to choose the maximum sleep time based on link speed and queue buffer capacity. By analyzing the relationship between the longest sleep time and the queue buffer capacity, it is concluded that inducing cognition into OFDM-PON can be used as an effective method to improve the energy efficiency.

关键词： Cognition OFDM-PON Sleeping time Link speed Queue buffer capacity

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Interactive Evolutionary Multi-Objective Optimization Algorithm Using Cone Dominance

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Journal of Harbin Institute of technology(New Series) 2015年第6期22卷 76-84页

作者： Dalaijargal Purevsuren Saif ur Rehman Gang Cui Jianmin Bao Nwe Nwe Htay Win School of Computer Science and Technology Harbin Institute of Technology Key Lab of Broadband Wireless Communication and Sensor Network Technology (Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology) Ministry of Education

As the number of objectives increases,the performance of the Pareto dominance-based Evolutionary Multi-objective Optimization( EMO) algorithms such as NSGA-II,SPEA2 severely deteriorates due to the drastic increase in the Pareto-incomparable solutions. We propose a sorting method which classifies these incomparable solutions into several ordered classes by using the decision maker's( DM) preference *** is accomplished by designing an interactive evolutionary algorithm and constructing convex cones. This method allows the DMs to drive the search process toward a preferred region of the Pareto optimal front. The performance of the proposed algorithm is assessed for two,three,and four-objective knapsack problems. The results demonstrate the algorithm ' s ability to converge to the most preferred point. The evaluation and comparison of the results indicate that the proposed approach gives better solutions than that of NSGA-II. In addition,the approach is more efficient compared to NSGA-II in terms of the number of generations required to reach the preferred point.

关键词： multi-objective optimization evolutionary optimization preference information pareto dominance cone dominance

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Direction-of-arrival estimation based on Toeplitz covariance matrix reconstruction

Direction-of-arrival estimation based on Toeplitz covariance...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Xiaohuan Wu Wei-Ping Zhu Jun Yan Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China Department of Electrical and Computer Engineering Concordia University Montreal Canada

ISBN: (纸本)9781479999897

This paper addresses the issue of direction-of-arrival (DOA) estimation with an objective to eliminate the off-grid effect of the sparsity-based methods and enlarge the maximum number of distinguishable signals in the subspace-based methods. We first reconstruct the covariance matrix of the array output in the Toeplitz structure and then employ the reconstructed covariance matrix together with root-MUSIC to estimate the DOAs. The proposed covariance matrix reconstruction approach (CMRA) can be used for uniform and sparse linear arrays. It can also estimate the DOAs of multiple signals that are larger than the number of sensors by taking advantage of the array geometry. In contrast to the sparsity-based methods, CMRA is formulated in the continuous angle space rather than the discretized one, and hence it is immune to the off-grid effect. Simulations are carried out to verify the effectiveness of our method.

关键词： Covariance matrices Direction-of-arrival estimation Estimation sensor arrays Minimization Eigenvalues and eigenfunctions Geometry

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