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2019 IEEE Global communications Conference (GLOBECOM)

作者： Liang Li Xinyue Zhang Ronghui Hou Hao Yue Hui Li Miao Pan School of Cyber Engineering Xidian University P. R. China Science and Technology on Communication Networks Laboratory Department of Electrical and Computer Engineering University of Houston Houston TX Department of Computer Science San Francisco State University San Francisco CA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

Mobile crowdsensing is recognized to be a promising paradigm wherein location-based sensing tasks are outsourced to participants carrying mobile devices. A prominent issue of crowdsensing is to guarantee the sensing coverage by appropriately recruiting participating devices, which requires the disclosure of participants' locations and leads to potential location privacy threats. In this paper, we aim to develop a privacy-preserving participant recruiting scheme for mobile crowdsensing, which guarantees the crowdsensing coverage while preserving participants' location differential privacy against a semi-honest crowdsensing aggregator. Briefly, based on the differential private geo-indistinguishability method, we enable candidate participants to locally perturb their location data. With the obfuscated location information, we formulate the crowdsensing coverage optimization as an Integer Program (IP), and develop a 1-(1 - 1/f) f -approximation algorithm, which yields a near-optimal participant recruiting solution. Through extensive simulations, we demonstrate the tradeoff between privacy preservation and crowdsensing utility, and show that satisfactory crowdsensing coverage can be achieved while preserving the participants' differential location privacy.

关键词： Privacy Sensors Task analysis Recruitment Approximation algorithms Monitoring

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3D Geometry-Based UAV-MIMO Channel Modeling and Simulation

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China communications 2018年第12期15卷 64-74页

作者： Rubing Jia Yiran Li Xiang Cheng Bo Ai State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University School of electronic and information engineering of Beijing Jiaotong University Beijing Jiaotong University

A more general narrowband regular-shaped geometry-based statistical model(RS-GBSM) combined with the line of sight(LoS) and single bounce(SB) rays for unmanned aerial vehicle(UAV) multiple-input multiple-output(MIMO) channel is proposed in this paper. The channel characteristics, including space-time correlation function(STCF), Doppler power spectral density(DPSD), level crossing rate(LCR) and average fade duration(AFD), are derived based on the single sphere reference model for a non-isotropic environment. The corresponding sum-of-sinusoids(SoS) simulation models including both the deterministic model and statistical model with finite scatterers are also proposed for practicable implementation. The simulation results illustrate that the simulation models well reproduce the channel characteristics of the single sphere reference model with sufficient simulation scatterers. And the statistical model has a better approximation of the reference model in comparison with the deterministic one when the simulation trials of the stochastic model are sufficient. The effects of the parameters such as flight height, moving direction and Rice factor on the characteristics are also studied.

关键词： UAV-MIMO geometry-based model channel characteristics simulation model

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Backscatter-Based Cooperative NOMA

Backscatter-Based Cooperative NOMA

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IEEE International Symposium on Personal, Indoor and Mobile Radio communications (PIMRC)

作者： Weiyu Chen Haiyang Ding Shilian Wang Daniel Benevides da Costa Fengkui Gong Pedro Henrique Juliano Nardelli College of Electronic Science and Technology National University of Defence Technology Changsha China College of Information and Communication National University of Defence Technology Xi’an China Department of Computer Engineering Federal University of Ceará Sobral CE Brazil State Key Laboratory of Integrated Service Networks Xidian University Xi’an China School of Energy Systems Lappeenranta University of Technology Lappeenranta Finland

ISBN: (数字)9781728144900

ISBN: (纸本)9781728144917

A backscatter cooperation (BC) mechanism is pro-posed for power-domain non-orthogonal multiple access (NOMA) downlink transmission. The key idea is to enable one user to split and then backscatter part of its received signals to improve the reception at another user. To evaluate its performance, three benchmark schemes are introduced. They are non-cooperation (NC)-NOMA, conventional relaying (CR)-NOMA, and incremental relaying (IR)-NOMA. For all these schemes, the analytical expressions of the minimum total power to avoid information outage are derived, based on which their respective outage performance, expected rates, and diversity-multiplexing trade-off (DMT) are investigated. Analytical results show that the proposed BC-NOMA strictly outperforms NC-NOMA in terms of all the three metrics. Furthermore, theoretical analyses are validated via Monte-Carlo simulations. It is shown that compared with CR/IR-NOMA, only the proposed BC-NOMA scheme can enhance the transmission reliability without impairing the transmission rate.

关键词： NOMA Backscatter Signal to noise ratio Interference Downlink Decoding Fading channels

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Reducing motion blur in ghost imaging with Hessian enhancement filter

Reducing motion blur in ghost imaging with Hessian enhanceme...

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Computational Optical Sensing and Imaging, COSI 2019

作者： Chang, Chen Yang, Dongyue Li, Junhui Wu, Guohua Luo, Bin Yin, Longfei Guo, Hong School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China 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

In ghost imaging with pseudo-thermal light, Hessian enhancement filter is applied in reference measurements to improve the image quality by reducing the motion blur caused by improper exposure settings at short cohere... 详细信息

ISBN: (纸本)9781943580637

关键词： Image enhancement

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Backscatter cooperation in NOMA communications systems

arXiv

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arXiv 2020年

作者： Chen, Weiyu Ding, Haiyang Wang, Shilian Costa, Daniel Benevides da Gong, Fengkui Nardelli, Pedro Henrique Juliano College of Electronic Science and Technology National University of Defense Technology Changsha China College of Information and Communication National University of Defense Technology Xi’an China Department of Computer Engineering Federal University of Ceará Sobral CE Brazil State Key Laboratory of Integrated Service Networks Xidian University Xi’an China School of Energy Systems Lappeenranta University of Technology Lappeenranta Finland

In this paper, a backscatter cooperation (BC) scheme is proposed for non-orthogonal multiple access (NOMA) downlink transmission. The key idea is to enable one user to split and then backscatter part of its received signals to improve the reception at another user. To evaluate the performance of the proposed BC-NOMA scheme, three benchmark schemes are introduced. They are the non-cooperation (NC)-NOMA scheme, the conventional relaying (CR)-NOMA scheme, and the incremental relaying (IR)NOMA scheme. For all these schemes, the analytical expressions of the minimum total power to avoid information outage are derived, based on which their respective outage performance, expected rates, and diversity-multiplexing trade-off (DMT) are investigated. Analytical results show that the proposed BC-NOMA scheme strictly outperforms the NC-NOMA scheme in terms of all the three metrics. Furthermore, theoretical analyses are validated via Monte-Carlo simulations. It is shown that unlike the CR-NOMA scheme and the IR-NOMA scheme, the proposed BC-NOMA scheme can enhance the Copyright © 2020, The Authors. All rights reserved.

关键词： Backscattering

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A benchmark test of boson sampling on Tianhe-2 supercomputer

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National science Review 2018年第5期5卷 715-720页

作者： Junjie Wu Yong Liu Baida Zhang Xianmin Jin Yang Wang Huiquan Wang Xuejun Yang Institute for Quantum Information & State Key Laboratory of High Performance Computing College of ComputerNational University of Defense Technology State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong University Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

Boson sampling, thought to be intractable classically, can be solved by a quantum machine composed of merely generation, linear evolution and detection of single photons. Such an analog quantum computer for this specific problem provides a shortcut to boost the absolute computing power of quantum computers to beat classical ones. However, the capacity bound of classical computers for simulating boson sampling has not yet been identified. Here we simulate boson sampling on the Tianhe-2 supercomputer, which occupied the first place in the world ranking six times from 2013 to 2016. We computed the permanent of the largest matrix using up to 312 000 CPU cores of Tianhe-2, and inferred from the current most efficient permanent-computing algorithms that an upper bound on the performance of Tianhe-2 is one 50-photon sample per ～100 min. In addition, we found a precision issue with one of two permanent-computing algorithms.

关键词： boson sampling permanent quantum supremacy quantum computing supercomputer

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Pseudo pilot-aided OFDM system with high spectral efficiency for high performance coaxial transmission

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science China(Information sciences) 2017年第6期60卷 191-199页

作者： Yue LIU Chuanchuan YANG Hongbin LI State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

High performance network over coax(HINOC) has become next-generation broadcasting network(NGB) industry standard of China, as well as International Telecommunication Union(ITU) telecommunication standard, which adopts orthogonal frequency division multiplexing(OFDM) technique and high order modulation formats. As is known, in OFDM system, phase noise destroys the orthogonality of the subcarriers and degrades the performance of the system especially when the data are transmitted in high order modulation formats. In this paper, we propose a high spectral efficiency OFDM system utilizing a novel and almost blind phase noise compensation method mainly used for high performance coaxial transmission. In our system, some subcarriers, which remain to transmit unknown useful data in lower order modulation formats, are selected as pseudo pilots instead of pilots to suppress phase noise effectively and high spectral efficiency can be achieved with the aid of puncturing mechanisms. Simulation results show that the proposed pseudo pilot-aided OFDM system can achieve the performance of the pilot-aided counterpart yet acquiring higher spectral efficiency.

关键词： orthogonal frequency division multiplexing(OFDM) high performance network over coax(HINOC) phase noise pseudo pilots broadcasting

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Undesigning the internet: An exploratory study of reducing everyday internet connectivity 5th

Undesigning the internet: An exploratory study of reducing e...

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5th International Conference on Information and communication Technology for Sustainability, ICT4S 2018

作者： Widdicks, Kelly Ringenson, Tina Pargman, Daniel Kuppusamy, Vishnupriya Lago, Patricia School of Computing and Communications Lancaster University United Kingdom School of Architecture and the Built Environment KTH Royal Institute of Technology Sweden School of Computer Science and Communication KTH Royal Institute of Technology Sweden Department of Sustainable Communication Networks University of Bremen Germany Department of Computer Science Vrije Universiteit Amsterdam Netherlands

Internet connectivity is seamlessly integrated into many of our everyday habits and activities. Despite this, previous research has highlighted that our rather excessive Internet use is not sustainable or even always socially beneficial. In this paper, we carried out an exploratory study on how Internet disconnection affects our everyday lives and whether such disconnection is even possible in today’s society. Through daily surveys, we captured what Internet use means for ten participants and how this varies when they are asked to disconnect by default, and re-connect only when their Internet use is deemed as necessary. From our study, we found that our participants could disconnect from the Internet for certain activities (particularly leisure focused), yet they developed adaptations in their lives to address the necessity of their Internet use. We elicit these adaptations into five themes that encompass how the participants did, or did not, use the Internet based on their necessities. Drawing on these five themes, we conclude with ways in which our study can inspire future research surrounding: Internet infrastructure limits;the promotion of slow values;Internet non-use;and the undesign of Internet services. © 2018, EasyChair. All rights reserved.

关键词： Leisure

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Priority-Oriented Trajectory Planning for UAV-Aided Time-Sensitive IoT networks

Priority-Oriented Trajectory Planning for UAV-Aided Time-Sen...

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IEEE International Conference on communications Workshops, ICC

作者： Nanxin Wang Yifei Xin Jingheng Zheng Jingjing Wang Xiao Liu Xiangwang Hou Yuanwei Liu International School Beijing University of Posts and Telecommunications Beijing China School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Department of Electronic Engineering Tsinghua University Beijing China School of Electronic Engineering and Computer Science Queen Mary University of London London U.K. State Key Laboratory of Integrated Services Networks Xidian University Xi'an China

ISBN: (数字)9781728174402

ISBN: (纸本)9781728174419

Unmanned Aerial Vehicles (UAVs) have been widely employed in the Internet of Things (IoT) networks due to their high mobility and high probability of line-of-sight (LoS) propagation. Equipped with certain payloads, UAVs are able to gather data from sensors located in a particular area where no ground base station is available for transmitting data, such as oceans and mountains. However, for a time-sensitive network, the latency has to be minimized, especially in heterogeneous scenarios where each sensor has its own latency tolerance, which emphasizes the importance of trajectory design of UAVs. In this paper, we propose a priority-oriented trajectory planning problem for a UAV-aided time-sensitive heterogeneous IoT network, based on which we provide a solution for satisfying the latency tolerance of the network within a given period of time. Aiming at optimizing trajectories, we employ continuous Deep Q-Learning Network (DQN) which is proven to be capable of identifying a relatively optimal trajectory compared to the benchmarks through a large number of experiments. Simulation results are provided for demonstrating that the proposed DQN-based algorithm outperforms the benchmarks. More particularly, the proposed DQN-based algorithm is capable of achieving in excess of 49% and 10% improvements in system costs over the greedy algorithm and Q-Learning algorithm, respectively.

关键词： Trajectory Planning Sensor systems Internet of Things Cost function Benchmark testing

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Opportunistic Scheduling Revisited Using Restless Bandits: Indexability and Index Policy

Opportunistic Scheduling Revisited Using Restless Bandits: I...

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作者： Wang, Kehao Yu, Jihong Chen, Lin Zhou, Pan Ge, Xiaohu Win, Moe Z. Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks Wuhan University of Technology Wuhan430070 China School of Information and Electronics Beijing Institute of Technology Beijing100081 China School of Data Computer Science Sun Yat-sen University Guangzhou510275 China School of Electrical and Information Communications Huazhong University of Science and Technology Wuhan430074 China Laboratory for Information and Decision Systems Massachusetts Institute of Technology CambridgeMA02139 United States

We revisit the opportunistic scheduling problem in which a server opportunistically serves multiple classes of users under time-varying multi-state Markovian channels. The aim of the server is to find an optimal policy minimizing the average waiting cost of those users. Mathematically, the problem can be recast to a restless multiarmed bandit one, and a pivot to solve restless bandit by the Whittle index approach is to establish indexability. Despite the theoretical and practical importance of the Whittle index policy, the indexability is still open for opportunistic scheduling in the heterogeneous multi-state channel case. To fill this gap, we mathematically identify a set of sufficient conditions on a channel state transition matrix under which the indexability is guaranteed and consequently, the Whittle index policy is feasible. Furthermore, we obtain the closed-form Whittle index by exploiting the structural property of the channel state transition matrix. For a generic channel state transition matrix, we propose an eigenvalue-arithmetic-mean scheme to obtain the corresponding approximate matrix which satisfies the sufficient conditions, and consequently can get an approximate Whittle index. This paper constitutes a small step toward solving the opportunistic scheduling problem in its generic form involving multi-state Markovian channels and multi-class users. © 2002-2012 IEEE.

关键词： Eigenvalues and eigenfunctions

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