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Frontiers in Optics, FIO 2018

作者： Zhao, Yijia Zhang, Yichen Huang, Yundi Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Peking University Beijing100871 China

We propose a high-precision phase noise estimation for continuous-variable quantum key distribution to reduce the phase noise caused by inaccurate estimation. The phase noise is reduced below 1/10 by using modified re... 详细信息

ISBN: (纸本)9781943580460

关键词： Phase noise

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Receive buffer pre-division based flow control for MPTCP 1

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13th International Conference on Mobile Ad-hoc and Sensor networks, MSN 2017

作者： Han, Jiangping Xue, Kaiping Yue, Hao Hong, Peilin Yu, Nenghai Li, Fenghua Department of EEIS University of Science and Technology of China HefeiAnhui230027 China Science and Technology on Communication Networks Laboratory ShijiazhuangHebei050081 China Department of Computer Science San Francisco State University San FranciscoCA94132 United States State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China

ISBN: (数字)9789811088902

ISBN: (纸本)9789811088896

Multipath TCP (MPTCP) enables terminals utilizing multiple interfaces for data transmission simultaneously, which provides better performance and brings many benefits. However, using multiple paths brings some new challenges. The asymmetric parameters among different subflows may cause the out-of-order problem and load imbalance problem, especially in wireless network which has more packet loss. Thus it will significantly degrade the performance of MPTCP. In this paper, we propose a Receive Buffer Pre-division based flow control mechanism (RBP) for MPTCP. RBP divides receive buffer according to the prediction of receive buffer occupancy of each subflow, and controls the data transmission on each subflow using the divided buffer and the number of out-of-order packets, which can significantly improve the performance of MPTCP. We use the NS-3 simulations to verify the performance of our scheme, and the simulation results show that RBP algorithm can significantly increase the global throughput of MPTCP. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Flow control

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Iterative LMMSE individual channel estimation over relay networks with multiple antennas

Iterative LMMSE individual channel estimation over relay net...

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作者： Ma, Jianpeng Zhang, Shun Li, Hongyan Zhao, Nan Nallanathan, Arumugam State Key Laboratory of Integrated Services Networks Xidian University Xi'an710071 China School of Information and Communication Engineering Dalian University of Technology Dalian116024 China School of Electronic Engineering and Computer Science Queen Mary University of London LondonE14NS United Kingdom

In this paper, we investigate the individual channel estimation over the three-node one-way relay network, where all the nodes are equipped with multiple antennas. We first examine one simple but representative scenario, where the relay node is equipped with a single antenna. An iterative linear minimum mean-square-error (LMMSE) method, which has fast convergence speed, is proposed to estimate the individual channels. We derive the closed-form least square channel estimator through the matrix unitary diagonalization to provide one good initialization point for the iterativeLMMSEestimator. To evaluate the performance of the proposed algorithm, we present two performance lower bounds: Bayesian Cramér lower bound and linear estimation lower bound (LELB). Then, the training block and the relay amplification factor are optimized through minimizing the LELB. After that, our studies are extended to the general case, where all the nodes are equipped with multiple antennas. Finally, numerical results are provided to corroborate our proposed studies. © 2017 IEEE.

关键词： Channel estimation

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Mobility Prediction Based Virtual Routing for Ad Hoc UAV Network

Mobility Prediction Based Virtual Routing for Ad Hoc UAV Net...

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IEEE Global communications Conference

作者： Menglei Jiang Qixun Zhang Zhiyong Feng Zhu Han Wei Li Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications Ministry of Education Beijing P.R. China Science and Technology on Communication Networks Laboratory Shijiazhuang P.R. China Electrical and Computer Engineering Department University of Houston Houston TX Department of Electrical Engineering Northern Illinois University Dekalb IL USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

Due to the three dimensional mobility advantage of unmanned aerial vehicles (UAVs), a swarm of UAVs can be conveniently deployed and work cooperatively to enlarge the coverage and relay data for environment monitoring and emergency communication scenarios. However, the high mobility of UAV brings new challenges to guarantee the robust and efficient routing in a dynamic changing network topology. Therefore, a mobility prediction based virtual routing (MPVR) algorithm is proposed to enhance the performances of connectivity and routing lifetime among cooperative UAVs. And the probability density function of UAV movements is theoretically achieved using the Gaussian distribution model. Moreover, an optimal virtual routing model is designed to select the optimal relay node with the minimum distance between UAVs. Finally, our proposed MPVR algorithm is evaluated by simulation results, which can improve the average routing lifetime, the average link delay, and the packet delivery ratio compared to other conventional algorithms.

关键词： Routing Relays Unmanned aerial vehicles Heuristic algorithms Prediction algorithms Three-dimensional displays Solid modeling

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Efficient machine-type communication using multi-metric context-awareness for cars used as mobile sensors in upcoming 5G networks

arXiv

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arXiv 2018年

作者： Sliwa, Benjamin Liebig, Thomas Falkenberg, Robert Pillmann, Johannes Wietfeld, Christian Communication Networks Institute TU Dortmund University Dortmund44227 Germany Department of Computer Science VIII TU Dortmund University Dortmund44227 Germany

Upcoming 5G-based communication networks will be confronted with huge increases in the amount of transmitted sensor data related to massive deployments of static and mobile Internet of Things (IoT) systems. Cars acting as mobile sensors will become important data sources for cloud-based applications like predictive maintenance and dynamic traffic forecast. Due to the limitation of available communication resources, it is expected that the grows in Machine-Type communication (MTC) will cause severe interference with Human-to-human (H2H) communication. Consequently, more efficient transmission methods are highly required. In this paper, we present a probabilistic scheme for efficient transmission of vehicular sensor data which leverages favorable channel conditions and avoids transmissions when they are expected to be highly resource-consuming. Multiple variants of the proposed scheme are evaluated in comprehensive real-world experiments. Through machine learning based combination of multiple context metrics, the proposed scheme is able to achieve up to 164% higher average data rate values for sensor applications with soft deadline requirements compared to regular periodic transmission. Copyright © 2018, The Authors. All rights reserved.

关键词： 5G mobile communication systems

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Resource-efficient transmission of vehicular sensor data using context-aware communication

arXiv

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arXiv 2018年

Upcoming Intelligent Traffic Control Systems (ITSCs) will base their optimization processes on crowdsensing data obtained for cars that are used as mobile sensor nodes. In conclusion, public cellular networks will be confronted with massive increases in Machine-Type communication (MTC) and will require efficient communication schemes to minimize the interference of Internet of Things (IoT) data traffic with human communication. In this demonstration, we present an Open Source framework for context-aware transmission of vehicular sensor data that exploits knowledge about the characteristics of the transmission channel for leveraging connectivity hotspots, where data transmissions can be performed with a high grade if resource efficiency. At the conference, we will present the measurement application for acquisition and live-visualization of the required network quality indicators and show how the transmission scheme performs in real-world vehicular scenarios based on measurement data obtained from field experiments. Copyright © 2018, The Authors. All rights reserved.

关键词： Sensor nodes

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Additional Rayleigh-scattering phase in distributed acoustic sensing system

Additional Rayleigh-scattering phase in distributed acoustic...

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Optical Fiber Sensors, OFS 2018

作者： He, Xiangge Gu, Lijuan Liu, Fei Yi, Duo Zhang, Min Chen, Zhangyuan School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Physics Peking University Beijing100871 China Institute of Ocean Research Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China

The theoretical model for distributed acoustic sensing system is developed which agrees well with the experiment, and the phase fading phenomenon caused by additional Rayleigh-scattering phase is studied for the first... 详细信息

ISBN: (纸本)9781943580507

关键词： Rayleigh scattering

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Machine learning based context-predictive car-to-cloud communication using multi-layer connectivity maps for upcoming 5G networks

arXiv

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arXiv 2018年

作者： Sliwa, Benjamin Falkenberg, Robert Liebig, Thomas Pillmann, Johannes Wietfeld, Christian Communication Networks Institute TU Dortmund University Dortmund44227 Germany Department of Computer Science VIII TU Dortmund University Dortmund44227 Germany

While cars were only considered as means of personal transportation for a long time, they are currently transcending to mobile sensor nodes that gather highly upto-date information for crowdsensing-enabled big data services in a smart city context. Consequently, upcoming 5G communication networks will be confronted with massive increases in Machine-type communication (MTC) and require resourceefficient transmission methods in order to optimize the overall system performance and provide interference-free coexistence with human data traffic that is using the same public cellular network. In this paper, we bring together mobility prediction and machine learning based channel quality estimation in order to improve the resource-efficiency of car-to-cloud data transfer by scheduling the transmission time of the sensor data with respect to the anticipated behavior of the communication context. In a comprehensive field evaluation campaign, we evaluate the proposed context-predictive approach in a public cellular network scenario where it is able to increase the average data rate by up to 194% while simultaneously reducing the mean uplink power consumption by up to 54%. Copyright © 2018, The Authors. All rights reserved.

关键词： 5G mobile communication systems

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Practical security of continuous-variable quantum key distribution with reduced optical attenuation

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Physical Review A 2019年第1期100卷 012313-012313页

作者： Yi Zheng Peng Huang Anqi Huang Jinye Peng Guihua Zeng College of Information Science and Technology Northwest University Xi'an 710127 Shaanxi China State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai 200240 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 China Greatwall Quantum Laboratory China Greatwall Technology Changsha 410205 China

In a practical continuous-variable quantum key distribution (CVQKD) system, the optical attenuator can adjust the Gaussian-modulated coherent states and the local oscillator signal to an optimal value for guaranteeing the security of the system and optimizing the performance of the system. However, the performance of the optical attenuator may deteriorate due to the intentional and unintentional damage of the device. In this paper, we investigate the practical security of a CVQKD system with reduced optical attenuation. We find that the secret key rate of the system may be overestimated based on the investigation of parameter estimation under the effects of reduced optical attenuation. This opens a security loophole for Eve to successfully perform an intercept-resend attack in a practical CVQKD system. To close this loophole, we add an optical fuse at Alice's output port and design a scheme to monitor the level of optical attenuation in real time, which can make the secret key rate of the system evaluated precisely. The analysis shows that these countermeasures can effectively resist this potential attack.

关键词： Quantum communication Quantum cryptography Quantum information processing with continuous variables

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Embedded whispering-gallery mode microsphere resonator in a tapered hollow annular core fiber

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Photonics Research 2018年第12期6卷 1124-1129页

作者： JIAWEI WANG XIAOBEI ZHANG MING YAN LEI YANG FENGYU HOU WEN SUN XIAOTONG ZHANG LIBO YUAN HAI XIAO TINGYUN WANG Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University The Key Laboratory of In-Fiber Integrated Optics Ministry of Education College of Science Harbin Engineering University School of Electronic Engineering and Automation Guilin University of Electronic Technology Department of Electrical and Computer Engineering Clemson University

We propose and demonstrate a tapered hollow annular core fiber (HACF) coupler for excitation of whisperinggallery modes (WGMs) of an embedded microsphere resonator. The coupler is simply fabricated by fusion splicing of a segment of HACF with the single-mode fiber (SMF), and then improved by tapering the splicing joint to reduce the cone-apex angle. Therefore, the coupling efficiency from the SMF to the HACF is enhanced to excite various WGMs via evanescent field coupling. Normal positive, negative symmetrical Lorentzian and asymmetric Fano line shapes can be obtained by varying the resonator size and location. Another interesting phenomenon is observed that a higher Q-factor mode in a lower Q-factor mode has a contrast as high as 58. Temperature sensing with good stability is also demonstrated. This embedded WGM microsphere resonator in the tapered HACF is expected to promote environmental adaptability in practical applications due to its simplicity and

关键词： Single mode fiber (SMF) cavity Embedded WGM microsphere resonator

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