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arXiv 2019年

作者： Huang, Hongji Yang, Yuchun Wang, Hong Ding, Zhiguo Sari, Hikmet Adachi, Fumiyuki Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China Sequans Communications Colombes92700 France Jilin University Changchun130012 China School of Electrical and Electronic Engineering University of Manchester ManchesterM13 9PL United Kingdom Tohoku University Sendai980-8577 Japan

Unmanned aerial vehicles (UAVs) technique has been recognized as a promising solution in future wireless connectivity from the sky, and UAV navigation is one of the most significant open research problems, which has attracted wide interest in the research community. However, the current UAV navigation schemes are unable to capture the UAV motion and select the best UAV-ground links in real-time, and these weaknesses overwhelm the UAV navigation performance. To tackle these fundamental limitations, in this paper, we merge the state-of-the-art deep reinforcement learning with the UAV navigation through massive multiple input multiple output (MIMO) technique. To be specific, we carefully design a deep Q-network (DQN) for optimizing the UAV navigation by selecting the optimal policy, and then we propose a learning mechanism for processing the DQN. The DQN is trained so that the agent is capable of making decisions based on the received signal strengths for navigating the UAVs with the aid of the powerful Q-learning. Simulation results are provided to corroborate the superiority of the proposed schemes in terms of the coverage and convergence compared with that of other schemes. Copyright © 2019, The Authors. All rights reserved.

关键词： Deep learning

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Corrigendum to “3D shape segmentation via shape fully convolutional networks” [Computers & Graphics 70 (2018) 128–139]

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Computers and Graphics (Pergamon) 2018年 76卷 181-181页

作者： Wang, Pengyu Gan, Yuan Shui, Panpan Yu, Fenggen Zhang, Yan Chen, Songle Sun, Zhengxing State Key Lab for Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing210023 China Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing210003 China

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ZF-Based Beamforming for wireless Powered Cognitive Satellite-Terrestrial networks

ZF-Based Beamforming for Wireless Powered Cognitive Satellit...

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IEEE Global communications Conference

作者： Zhi Lin Min Lin Tomaso de Cola Benoit Champagne A. Lee Swindlehurst College of Communications Engineering Army Engineering University of PLA Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China Institute of Communications and Navigation German Aerospace Center (DLR) Germany Department of Electrical and Computer Engineering McGill University Montreal Canada Center for Pervasive Communications and Computing University of California Irvine Irvine USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

In this paper, we propose a novel zero-forcing (ZF)-based beamforming (BF) scheme for a wireless powered cognitive satellite-terrestrial network (CSTN) operated in the millimeter wave band. Assuming that the satellite and base station are equipped with multiple antennas, we aim at maximizing the sum rate of the CSTN while satisfying the signal-to-interference-plus-noise-ratio requirements for both the information receivers (IRs) and earth stations, the energy harvesting requirements of the energy receivers (ERs), and the secrecy constraints at the ERs. Since the resulting optimization problem is mathematically intractable, we propose a novel multi-beam-based ZF BF scheme to generate beamforming vectors to serve the IRs and ERs. Specifically, the original nonconvex problem is decomposed into two independent subproblems. The first subproblem, which features beam orthogonality constraints, leads to closed form solutions for the beamforming vectors. The second subproblem, aiming at finding the optimal power allocation, is solved via the S-procedure. Finally, the effectiveness of the proposed scheme is demonstrated by simulation results.

关键词： Erbium Satellite broadcasting wireless communication Satellite antennas Array signal processing Energy harvesting Optimization

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Outage Performance of Satellite-Aerial-Terrestrial network

Outage Performance of Satellite-Aerial-Terrestrial Network

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IEEE Globecom Workshops

作者： Qingquan Huang Min Lin Jun-Bo Wang Wei-Ping Zhu Communications Engineering College Army Engineering University of PLA Nanjing China The 63rd Research Institute National University of Defense Technology Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China Department of Electrical and Computer Engineering Concordia University Montreal Canada School of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

In this paper, we investigate the performance of an amplify-and-forward satellite-aerial-terrestrial network (SATN) with a multi-antenna unmanned aerial vehicle (UAV) relay, where the satellite-UAV link undergoes correlated Shadowed-Rician fading while the UAV-terrestrial links experience correlated Rician fading, respectively. Specifically, we first formulate a constrained optimization problem in terms of maximizing the system capacity to obtain the beamforming (BF) weight vectors at the UAV. By assuming that perfect channel state information (CSI) is unavailable, we design statistical CSI-aided BF scheme to enhance the system performance. Then, with the help of probability theory, we obtain the closed-form expression of outage probability for the considered SATN. Simulation results are provided to validate the effectiveness of our proposed BF scheme and the correctness of the derived expressions.

关键词： Satellites Unmanned aerial vehicles Relays Antenna arrays Signal to noise ratio wireless communication Optimization

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An Economy-mode Framework for Task Offloading in Fog Computing networks

An Economy-mode Framework for Task Offloading in Fog Computi...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Beibei Wang Fei Shen Xujie Li Fei Qin Feng Yan Siyuan Zhou College of computer and information Hohai University Nanjing China Shanghai Research Center for Wireless Communications Shanghai China Key Lab for Wireless Sensor network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China The School of Electronic and Electrical Communication Engineering University of Chinese Academy of Sciences Beijing China National Mobile Communications Research Laboratory Southeast University Nanjing China

In the fog network, by offtoading the computing tasks to the fog nodes (FNs) located at the edge of the network, the task processing delay of the terminal nodes (TNs) can be reduced significantly. However, not all the FNs are willing to help TNs for free. Therefore, an economy-mode framework for task offtoading in the fog network is required to motivate the FNs. In this paper, we formulate the task offtoading problem based on Stackelberg game. The TN with computing tasks acts as the leader and its strategy is the optimal unit computing price. Each FN with idle resources acts as the follower and its strategy is the sharable optimal proportion of computing capability. Firstly, the leader predicts the followers' strategies and provides the unit computing price. Next, given the price, the followers will do exactly what the leader wishes, which is the system optimal point. By maximizing the utility functions of both the TN and FNs, a win-win solution is obtained. The numerical simulations indicate the importance of our proposed economy-mode framework for task offtoading.

关键词： Task analysis Delays Games Energy consumption Edge computing Computational modeling wireless communication

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Measurement-device-independent quantum communication without encryption

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Science Bulletin 2018年第20期63卷 1345-1350页

作者： Peng-Hao Niu Zeng-Rong Zhou Zai-Sheng Lin Yu-Bo Sheng Liu-Guo Yin Gui-Lu Long state Key Laboratory of Low-dimensional Quantum Physics Beijing 100084.China Department of Physics Tsinghua UniversityBeijing 100084China Collaborative Innovation Center of Quantum Matter Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China Beijing National Research Center for Information Science and Technology BeUing 100084China School of Information and Technology.Tsinghua University Beijing 100084China lnstiute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China College of Telecommunications &Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of EducationNanjing 210003China

Security in communication is vital in modern life. At present, security is realized by an encryption process in cryptography. It is unbelievable if a secure communication is achievable without encryption. In quantum cryptography, there is a unique form of quantum communication, quantum secure direct communication, where secret information is transmitted directly over a quantum channel. Quantum secure direct communication is drastically distinct from our conventional concept of secure communication, because it does not require key distribution, key storage and ciphertext transmission, and eliminates the encryption procedure completely. Hence it avoids in principle all the security loopholes associated with key and ciphertext in traditional secure communications. For practical implementation, defects always exist in real devices and it may downgrade the security. Among the various device imperfections, those with the measurement devices are the most prominent and serious ones. Here we report a measurementdevice-independent quantum secure direct communication protocol using Einstein-Podolsky-Rosen pairs. This protocol eradicates the security vulnerabilities associated with the measurement device,and greatly enhances the practical security of quantum secure direct communication. In addition to the security advantage, this protocol has an extended communication distance, and a high communication capacity.

关键词： Quantum secure direct communication Measurement-device-independent Quantum dialogue Encryption Cryptography

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Secure transmission to the strong user with optimal power allocation in NOMA

arXiv

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arXiv 2018年

作者： Feng, Youhong Yan, Shihao Yang, Zhen Key Lab. of Ministry of Education in Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210003 China School of Engineering Macquarie University SydneyNSW Australia

With non-orthogonal multiple access (NOMA), we tackle the maximization of the secrecy rate for the strong user subject to a maximum allowable secrecy outage probability, while guaranteeing a constraint on the transmission rate to the weak user. For the first time, the dependence between the eavesdropper's ability to conduct successive interference cancellation and her channel quality is considered. We determine the optimal power allocation and the redundancy rate, based on which the cost of security in terms of the reduction in the strong user's secrecy rate is examined and the benefits of NOMA for secure transmissions are explicitly revealed. Copyright © 2018, The Authors. All rights reserved.

关键词： Redundancy

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Full-duplex light communication with a monolithic multicomponent system

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Light(Science & Applications) 2018年第1期7卷 255-261页

作者： Yongjin Wang Xin Wang Bingcheng Zhu Zheng Shi Jialei Yuan Xumin Gao Yuhuai Liu Xiaojuan Sun Dabing Li Hiroshi Amano Peter Grünberg Research Center Nanjing University of Posts and TelecommunicationsNanjing 210003China Laboratory of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of EducationNanjing 210003China Department of Electronics Engineering Zhengzhou UniversityScience Road 100Zhengzhou 450001China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Institute of Materials and Systems for Sustainability Nagoya UniversityNagoya 464-8062Japan

A monolithic multicomponent system is proposed and implemented on a III-nitride-on-silicon platform,whereby two multiple-quantum-well diodes(MQW-diodes)are interconnected by a suspended *** MQW-diodes have an identical low-In-content InGaN/Al0.10Ga0.90N MQW structure and are produced by the same fabrication process *** appropriately biased,both MQW-diodes operate under a simultaneous emission-detection mode and function as a transmitter and a receiver at the same time,forming an in-plane full-duplex light communication ***-time full-duplex audio communication is experimentally demonstrated using the monolithic multicomponent system in combination with an external circuit.

关键词： communication monolithic diodes

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Optimal Time Allocation in Relay Assisted Backscatter communication Systems

Optimal Time Allocation in Relay Assisted Backscatter Commun...

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IEEE Vehicular technology Conference

作者： Bin Lyu Zhen Yang Tianyi Xie Guan Gui Fumiyuki Adachi Key Laboratory of Ministry of Education in Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China Research Organization of Electrical Communication (ROEC) Tohoku University Sendai Japan

In this paper, we consider a relay assisted backscatter communication (RaBackCom) system, where a user backscatters incident signals from a carrier emitter (CE) to a relay and a receiver simultaneously, and then the relay forwards the user's information to the receiver for throughput improvement. We consider two cases that the relay is with/without an embedded energy source. Specifically, if the relay does not have an energy source, it first harvests energy from the signals from the CE and then uses its harvested energy for information forwarding. For both cases, we formulate time allocation problems on the user's information backscattering, the user's information forwarding, or the relay's energy harvesting to maximize the system throughput, and then derive closed-form solutions. Simulation results demonstrate the advantages of the proposed relay cooperation scheme with the optimal time allocation in terms of system throughput.

关键词： Relays Receivers Backscatter Throughput Resource management wireless communication Information processing

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Improving Q-factor of electromagnetically induced transparency based on mirrored metasurface

Improving Q-factor of electromagnetically induced transparen...

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IEEE Information technology and Mechatronics Engineering Conference (ITOEC)

作者： Haiming Li Youyun Xu College of Telecommunications & Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Broadband Wireless Communication and Sensor Network Technology Key Lab of Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu China

ISBN: (纸本)9781538653746

Improving Q-factor of analogy of electromagnetically induced transparency (EIT-like) based on the symmetric and asymmetric quasi-dark mode has been numerically demonstrated. The Q-factor of EIT-like based on the symmetric quasi-dark mode (mirrored metasurface) is an order of magnitude larger than the Q-factor of EIT-like based on the asymmetric quasi-dark mode. The low radiative loss of the symmetric quasi-dark mode causes the improved Q-factor. Furthermore, the proposed way of improving the Q-factor has important application in microwave, terahertz and optical metasurface.

关键词： Q-factor Metamaterials Couplings Wires Tomography Current distribution Telecommunications

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