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IEEE Global communications Conference

作者： Binbin Hu Rongqing Zhang Luoyang Fang Xiang Cheng Liuqing Yang State Key Laboratory of Advanced Optical Communication Systems & Networks School of EECS Peking University Beijing China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China School of Software Engineering Tongji University Shanghai China Department of Electrical and Computer Engineering Colorado State University Fort Collins CO USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

In recent years, autonomous driving has attracted a vast amount of attention from both industry and academia, which has introduced large amounts of region-related data. In order to release the burden in core networks caused by the communication demands for such data, various in-vehicle storage (IVS) systems have been widely studied to bring contents closer to users. To cope with the mobility issue hindering the realization of IVS systems, in this paper, we propose a relay selection strategy (RSS) consisting of the relay map construction (RMC) algorithm and the relay pair matching (RPM) algorithm with the assistance of the vehicle route information. By considering both the potential transmission amount and the waiting time, the proposed RSS generates an overall optimal relay assignment for the IVS system. The performance gain of the proposed RSS compared with the baseline is evaluated by a realistic simulator in terms of the relay failure ratio, the retrieval throughput, and the RSU consumption ratio. Simulation results show that the proposed RSS achieves higher efficiency and robustness than the baseline.

关键词： Relays Roads Robustness Prediction algorithms Mathematical model Wireless sensor networks Micromechanical devices

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A Laser-Pumped Cs-4He Magnetometer for Metrology

A Laser-Pumped Cs-4He Magnetometer for Metrology

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2018 Conference on Precision Electromagnetic Measurements, CPEM 2018

作者： Jiqing, Fu He, Wang Xiang, Peng Wei, Zhang Magnetic Quality Laboratory of National Institute of Metrology Beijing100013 China Center for Quantum Information Technology Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Beijing100871 China

ISBN: (纸本)9781538609736

This paper describes a laser-pumped cesium-helium magnetometer (CHM) with high polarization efficiency. The magnetic-resonance signal amplitude has been improved by one order of magnitude comparing with the lamp-pumped scheme. The optimal parameters for increasing the signal-to-noise ratio of the magnetometer are obtained and discussed. © 2018 IEEE.

关键词： Optical pumping

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UAV-assisted Data Dissemination With Proactive Caching and File Sharing in V2X networks

UAV-assisted Data Dissemination With Proactive Caching and F...

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IEEE Global communications Conference

作者： Rui Lu Rongqing Zhang Xiang Cheng Liuqing Yang Department of Electronics State Key Laboratory of Advanced Optical Communication Systems and Networks School of EECS Peking University Beijing China Shenzhen Research Institute of Big Data (SRIBD) Shenzhen China School of Software Engineering Tongji University Shanghai China Department of Electrical and Computer Engineering Colorado State University CO USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

Vehicle-to-Everything (V2X) communications refers to an intelligent and connected vehicular network where all vehicles and infrastructure systems are interconnected with each other. Data dissemination is playing an increasingly significant role in enhancing the network connectivity and data transmission performance. However, conventional scenarios and protocols cannot satisfy the growing pluralistic and superior quality of services (QoS) requirements of included vehicles. Therefore, in this paper, we propose a novel unmanned aerial vehicle (UAV)-assisted data dissemination protocol with proactive caching at the vehicles and an advanced file sharing strategy for revolutionizing communications. Specifically, in the proactive caching phase, we employ UAVs to act as flying base stations (BSs) for information interactions. Considering the time-variant network topology, we further propose a spatial scheduling (SS) algorithm for the trajectory optimization of each UAV, which can expedite the caching process and boost the system throughput. Then in the file sharing phase, based on the previous caching status, we provide a relay ordering algorithm to enhance the network transmission performance. Numerical results verify that our proposed UAV-assisted data transmission protocol can achieve a desirable system performance in terms of the downloading process, network throughput, and average data delivery delay.

关键词： Data dissemination Relays Protocols Quality of service Scheduling Throughput Wireless communication

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Search for Axionlike Dark Matter Using Solid-State Nuclear Magnetic Resonance

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Physical Review Letters 2021年第14期126卷 141802-141802页

作者： Deniz Aybas Janos Adam Emmy Blumenthal Alexander V. Gramolin Dorian Johnson Annalies Kleyheeg Samer Afach John W. Blanchard Gary P. Centers Antoine Garcon Martin Engler Nataniel L. Figueroa Marina Gil Sendra Arne Wickenbrock Matthew Lawson Tao Wang Teng Wu Haosu Luo Hamdi Mani Philip Mauskopf Peter W. Graham Surjeet Rajendran Derek F. Jackson Kimball Dmitry Budker Alexander O. Sushkov Department of Physics Boston University Boston Massachusetts 02215 USA Department of Electrical and Computer Engineering Boston University Boston Massachusetts 02215 USA Helmholtz-Institut GSI Helmholtzzentrum für Schwerionenforschung 55128 Mainz Germany Johannes Gutenberg-Universität Mainz 55128 Mainz Germany The Oskar Klein Centre for Cosmoparticle Physics Department of Physics Stockholm University AlbaNova 10691 Stockholm Sweden Nordita KTH Royal Institute of Technology and Stockholm University Roslagstullsbacken 23 10691 Stockholm Sweden Department of Physics Princeton University Princeton New Jersey 08544 USA State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics and Center for Quantum Information Technology Peking University Beijing 100871 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 201800 China School of Earth and Space Exploration Arizona State University Tempe Arizona 85287 USA Stanford Institute for Theoretical Physics Stanford University Stanford California 94305 USA Department of Physics and Astronomy The Johns Hopkins University Baltimore Maryland 21218 USA Department of Physics California State University–East Bay Hayward California 94542-3084 USA Department of Physics University of California Berkeley California 94720-7300 USA Photonics Center Boston University Boston Massachusetts 02215 USA

We report the results of an experimental search for ultralight axionlike dark matter in the mass range 162–166 neV. The detection scheme of our Cosmic Axion Spin Precession Experiment is based on a precision measurement of Pb207 solid-state nuclear magnetic resonance in a polarized ferroelectric crystal. Axionlike dark matter can exert an oscillating torque on Pb207 nuclear spins via the electric dipole moment coupling gd or via the gradient coupling gaNN. We calibrate the detector and characterize the excitation spectrum and relaxation parameters of the nuclear spin ensemble with pulsed magnetic resonance measurements in a 4.4 T magnetic field. We sweep the magnetic field near this value and search for axionlike dark matter with Compton frequency within a 1 MHz band centered at 39.65 MHz. Our measurements place the upper bounds |gd|<9.5×10−4 GeV−2 and |gaNN|<2.8×10−1 GeV−1 (95% confidence level) in this frequency range. The constraint on gd corresponds to an upper bound of 1.0×10−21 e cm on the amplitude of oscillations of the neutron electric dipole moment and 4.3×10−6 on the amplitude of oscillations of CP-violating θ parameter of quantum chromodynamics. Our results demonstrate the feasibility of using solid-state nuclear magnetic resonance to search for axionlike dark matter in the neV mass range.

关键词： Particle dark matter Axions Ferroelectrics Relaxor ferroelectrics Dark matter detectors Nuclear magnetic resonance Precision measurements

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Demonstration of weakly-coupled MDM-WDM amplification and transmission over 15-km FMF employing IM/DD

Demonstration of weakly-coupled MDM-WDM amplification and tr...

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Optical Fiber communication Conference, OFC 2018

作者： Zhu, Jinglong Li, Juhao Ge, Dawei Wu, Zhongying Ren, Fang Zhang, Zhenzhen Li, Xiaoying Zhang, Yichi Li, Zhengbin Chen, Zhangyuan He, Yongqi State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China Key Laboratory of Optoelectronics Information Technology Tianjin University Tianjin300072 China School of Computer and Communication Engineering University of Science and Technology Beijing Beijing100083 China Wuhan Research Institute of Posts and Telecommunications Wuhan430074 China

We propose an all-fiber few-mode EDFA employing low-modal-crosstalk modeselective couplers, based on which we experimentally demonstrate weakly-coupled MDM-WDM amplification and transmission over 2-mode 15-km FMF with... 详细信息

ISBN: (纸本)9781943580385

关键词： Erbium doped fiber amplifiers

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Power-Aware virtual network function placement and routing using an abstraction technique

arXiv

引用

arXiv 2018年

作者： Varasteh, Amir Andrade, Marilet De MacHuca, Carmen Mas Wosinska, Lena Kellerer, Wolfgang Department of Communication Networks Department of Electrical and Computer Engineering Technical University of Munich Germany Optical Networks Lab. KTH Royal Institute of Technology Stockholm Sweden

The Network Function Virtualization (NFV) is very promising for efficient provisioning of network services and is attracting a lot of attention. NFV can be implemented in commercial off-the-shelf servers or Physical Machines (PMs), and many network services can be offered as a sequence of Virtual Network Functions (VNFs), known as VNF chains. Furthermore, many existing network devices (e.g., switches) and collocated PMs are underutilized or over-provisioned, resulting in low powerefficiency. In order to achieve more energy efficient systems, this work aims at designing the placement of VNFs such that the total power consumption in network nodes and PMs is minimized, while meeting the delay and capacity requirements of the foreseen demands. Based on existing switch and PM power models, we propose a Integer Linear Programming (ILP) formulation to find the optimal solution. We also propose a heuristic based on the concept of Blocking Islands (BI), and a baseline heuristic based on the Betweenness Centrality (BC) property of the graph. Both heuristics and the ILP solutions have been compared in terms of total power consumption, delay, demands acceptance rate, and computation time. Our simulation results suggest that BIbased heuristic is superior compared with the BC-based heuristic, and very close to the optimal solution obtained from the ILP in terms of total power consumption and demands acceptance rate. Compared to the ILP, the proposed BI-based heuristic is significantly faster and results in 22% lower end-to-end delay, with a penalty of consuming 6% more power in average. Copyright © 2018, The Authors. All rights reserved.

关键词： Network function virtualization

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Multi-Level Virtual Desktop Security Enhancement Technology Based on Docker and X server

Multi-Level Virtual Desktop Security Enhancement Technology ...

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作者： Guangqiang Luan Yuebin Bai Chao Yu Xudong Zhang Rui Wang Longshe Huo School of Computer Science and Engineering Beihang University Science and Technology on Communication Networks Laboratory China Unicom Network Technology Research Institute

With the development of virtualization technology,desktop virtualization is becoming more and more *** virtualization can effectively isolate the use of users and the management of the system,but in the access to virtual desktops,its security has become a key factor which can't be *** this paper,we propose a set of technologies that enhance the security of virtual desktops and can effectively secure virtual desktops from multiple *** improve the spice protocol and implement the multi-level access mechanism of users and virtual *** Docker technology is used to implement the isolation of the communication,storage and network between the virtual desktop *** on the X server mechanism,we isolate the virtual desktop client from GUI *** experimental results have shown the effects from various aspects,as well as differences in performance with the original client.

关键词： virtual desktop spice Docker X server security

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Experimental implementation of high-speed balanced homodyne detector

Experimental implementation of high-speed balanced homodyne ...

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Frontiers in Optics, FIO 2018

作者： Zhang, Xiaoxiong Zhang, Yichen Xu, Bingjie Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Advanced Optical Communications Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Center for Computational Science and Engineering Peking University Beijing100876 China

We present a high-speed balanced homodyne detector whose bandwidth is above 900 MHz and quantum to classical noise ratio reaches 12 dB respectively, which could be applied to the high-speed continuous variable quantum... 详细信息

ISBN: (纸本)9781943580460

关键词： Quantum optics

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5G-ALLSTAR: An Integrated Satellite-Cellular System for 5G and Beyond

5G-ALLSTAR: An Integrated Satellite-Cellular System for 5G a...

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IEEE Wireless communications and Networking Conference Workshops (WCNCW)

作者： Junhyeong Kim Guido Casati Antonio Pietrabissa Alessandro Giuseppi Emilio Calvanese Strinati Nicolas Cassiau Gosan Noh Heesang Chung Ilgyu Kim Marjorie Thary Jean-Michel Houssin Federico Pigni Sylvain Colombero Pierre Dal Zotto Leszek Raschkowski Stephan Jaeckel Future Mobile Communication Research Division ETRI Daejeon Korea Broadband and Broadcast Department Fraunhofer IIS Erlangen Germany Department of Computer Control and Management Engineering University of Rome “Sapienza” Rome Italy Space Research Group Consortium for the Research in Automation and Telecommunication (CRAT) Rome Italy CEA-Leti Grenoble France CEA-Leti MINATEC Campus Grenoble France Thales Alenia Space Toulouse France Department of Management Technology and Strategy Grenoble Ecole de Management - Univ Grenoble Alpes ComUE Grenoble France Wireless Communications and Networks Department Fraunhofer Institute for Telecommunications Heinrich Hertz Institute HHI Berlin Germany Stephan Jaeckel Consulting Germany

ISBN: (数字)9781728151786

ISBN: (纸本)9781728151793

This paper provides an overview of recent research activities of the 5G AgiLe and fLexible integration of SaTellite And cellulaR (5G-ALLSTAR) project which aims to develop Multi-Connectivity technology that integrates the cellular and satellite networks to provide seamless, reliable and ubiquitous broadband services. 5G-ALLSTAR also entails developing millimeter-wave (mmWave) 5G New Radio (NR)-based cellular access system and investigating the feasibility of NR-based satellite access for providing broadband and reliable 5G services. In addition, spectrum sharing between cellular and satellite networks is studied. With all the technologies developed, 5G-ALLSTAR will showcase the first fully integrated satellite and cellular prototype system for 5G and beyond 5G (B5G) services at a big event (e.g., sporting event like Roland-Garros) in 2021. This paper also provides a preliminary techno-economic analysis on potential use cases targeting vertical markets, and introduces recent standardization activities of relevance.

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IEEE Global communications Conference

作者： Haojie Feng Yanxiang Jiang Dusit Niyato Fu-Chun Zheng Xiaohu You National Mobile Communications Research Laboratory Southeast University Nanjing China State Key Laboratory of Integrated Services Networks Xidian University Xi'an China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China School of Computer Engineering Nanyang Technological University (NTU) Singapore School of Electronic and Information Engineering Harbin Institute of Technology Shenzhen China

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

In this paper, the content popularity prediction problem in cache-enabled fog radio access networks (F-RANs) is investigated. In order to make the popularity prediction accurate and adaptive, we propose to learn the corresponding popularity prediction model for every content class from the preprocessed popularity series by training a simplified bidirectional long short-term memory (Bi-LSTM) network, and further use it to help build a content classifier in terms of content popularity trend in the training phase. Then, content popularity can be predicted by the right prediction model with respect to the corresponding content class in the predicting phase. Considering that it is hard to collect enough data about numerous content features through F-APs, we propose to only use the number of requests. Our proposed content popularity prediction policy offers a high prediction accuracy with low computational complexity by transferring the high complexity tasks from the predicting phase to the training phase. Simulation results show that the cache hit rate of our proposed policy approaches the optimal performance.

关键词： Predictive models Training Market research Computational modeling Machine learning Radio access networks Adaptation models

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