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Science China(Information Sciences) 2017年第10期60卷 155-168页

作者： Jing YANG Hongyan WANG Jie ding Xiqi GAO zhiguo ding National Mobile Communications Research Laboratory Southeast University School of Information Engineering Yangzhou University Department of Communication Systems Lancaster University

In this work, we investigate the spectral efficiency(SE) and energy efficiency(EE) for a massive multiple-input multiple-output multi-pair two-way amplify-and-forward relaying system, where multi-pair users exchange information via a relay station equipped with large scale antennas. We assume that imperfect channel state information is available and maximum-ratio combining/maximum-ratio transmission beamforming is adopted at the relay station. Considering constant or scaled transmit power of pilot sequences, we quantify the asymptotic SE and EE under general power scaling schemes, in which the transmit power at each user and relay station can both be scaled down, as the number of relay antennas tends to infinity. In addition, a closed-form expression of the SE has been obtained approximately. Our results show that by using massive relay antennas, the transmit power at each user and the relay station can be scaled down, with a non-vanishing signal to interference and noise ratio(SINR). Finally, simulation results confirm the validity of our analysis.

关键词： massive MIMO two-way relaying power scaling imperfect CSI energy efficiency spectral efficiency

Hybrid NOMA Based MIMO Offloading for Mobile Edge Computing in 6G Networks

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China Communications 2022年第10期19卷 12-20页

作者： Yunus Dursun Fang Fang zhiguo ding School of Electrical and Electronic Engineering University of ManchesterManchesterUK Department of Electrical and Computer Engineering and the Department of Computer Science Western UniversityLondonCanada

Non-orthogonal multiple access (NOMA), multiple-input multiple-output (MIMO) and mobile edge computing (MEC) are prominent technologies to meet high data rate demand in the sixth generation (6G) communication networks. In this paper, we aim to minimize the transmission delay in the MIMO-MEC in order to improve the spectral efficiency, energy efficiency, and data rate of MEC offloading. Dinkelbach transform and generalized singular value decomposition (GSVD) method are used to solve the delay minimization problem. Analytical results are provided to evaluate the performance of the proposed Hybrid-NOMA-MIMO-MEC system. Simulation results reveal that the H-NOMA-MIMO-MEC system can achieve better delay performance and lower energy consumption compared to OMA.

关键词： NOMA MEC MIMO Generalized sin-gular value decomposition sixth generation networks(6G) delay minimization

Joint resource allocation for hybrid NOMA-assisted MEC in 6G networks

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Digital Communications and Networks 2020年第3期6卷 241-252页

作者： Haodong Li Fang Fang zhiguo ding Department of Electrical and Electronic Engineering The University of ManchesterM139PLUK Department of Engineering Durham UniversityDurham DH13LEUK

Multi-access Edge Computing(MEC)is an essential technology for expanding computing power of mobile devices,which can combine the Non-Orthogonal Multiple Access(NOMA)in the power domain to multiplex signals to improve spectral *** study the integration of the MEC with the NOMA to improve the computation service for the Beyond Fifth-Generation(B5G)and the Sixth-Generation(6G)wireless *** paper aims to minimize the energy consumption of a hybrid NOMA-assisted MEC *** a hybrid NOMA system,a user can offload its task during a time slot shared with another user by the NOMA,and then upload the remaining data during an exclusive time duration served by Orthogonal Multiple Access(OMA).The original energy minimization problem is *** efficiently solve it,we first assume that the user grouping is given,and focuses on the one group ***,a multilevel programming method is proposed to solve the non-convex problem by decomposing it into three subproblems,i.e.,power allocation,time slot scheduling,and offloading task assignment,which are solved optimally by carefully studying their convexity and *** derived solution is optimal to the original problem by substituting the closed expressions obtained from those decomposed ***,we investigate the multi-user case,in which a close-to-optimal algorithm with lowcomplexity is proposed to form users into different groups with unique time *** simulation results verify the superior performance of the proposed scheme compared with some benchmarks,such as OMA and pure NOMA.

关键词： Non-orthogonal multiple access(NOMA) Multi-access edge computing(MEC) Resource allocation User grouping Task assignment

An online anomaly detection method for stream data using isolation principle and statistic histogram

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第2期6卷 85-106页

作者： zhiguo ding Minrui Fei Dajun Du Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 P.R.China College of Mathematics Physics and Information Engineering Zhejiang Normal University JinhuaZhejiang 321004P.R.China

Online anomaly detection for stream data has been explored recently,where the detector is supposed to be able to perform an accurate and timely judgment for the upcoming ***,due to the inherent complex characteristics of stream data,such as quick generation,tremendous volume and dynamic evolution distribution,how to develop an effective online anomaly detection method is a *** main objective of this paper is to propose an adaptive online anomaly detection method for stream *** is achieved by combining isolation principle with online ensemble learning,which is then optimized by statistic *** main algorithms are developed,i.e.,online detector building algorithm,anomaly detecting algorithm and adaptive detector updating *** evaluate our proposed method,four massive datasets from the UCI machine learning repository recorded from real events were *** simulations based on these datasets show that our method is effective and robust against different scenarios.

关键词： Online anomaly detection stream data isolation principle ensemble learning statistic histogram

Key techniques for 5G wireless communications:network architecture, physical layer,and MAC layer perspectives

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Science China(Information Sciences) 2015年第4期58卷 5-24页

作者： MA Zheng ZHANG ZhengQuan ding zhiguo FAN PingZhi LI HengChao Provincial Key Lab of Information Coding and Transmission Southwest Jiaotong University Department of Communication Systems Lancaster University

The fourth generation(4G) mobile communication systems are offering service worldwide *** 4G systems could be loaded with much more services and data than previous systems, there is still a dramatic gap between the people’s practical requirements and what can be offered by the 4G ***, the research and development for the fifth generation(5G) systems have already been started. This article presents an overview of potential network architecture and highlights several promising techniques which could be employed in the future 5G systems. These techniques include non-orthogonal multiple access(NOMA),massive multiple input and multiple output(MIMO), cooperative communications and network coding, full duplex(FD), device-to-device(D2D) communications, millimeter wave communications, automated network organization, cognitive radio(CR), and green communications. The state-of-art and implementation issue of these techniques are also addressed.

关键词： 5G software defined network non-orthogonal multiple access massive MIMO full duplex deviceto-device communications millimeter wa

Application of NOMA for cellular-connected UAVs:opportunities and challenges

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Science China(Information Sciences) 2021年第4期64卷 26-39页

作者： Wee Kiat NEW Chee Yen LEOW Keivan NAVAIE Yanshi SUN zhiguo ding Wireless Communication Centre School of Electrical Engineering Faculty of EngineeringUniversiti Teknologi Malaysia Key Laboratory of Wireless-Optical Communications Chinese Academy of SciencesSchool of Information Science and Technology University of Science and Technology of China School of Electrical and Electronic Engineering The University of Manchester School of Computing and Communications Lancaster University

Unmanned aerial vehicles(UAVs) have gained considerable interests in numerous civil applications. To push forward its potentials, cellular-connected UAVs have been introduced. Nevertheless, cellular networks face several bottlenecks such as spectrum scarcity and limited concurrent connectivity. To address these issues, non-orthogonal multiple access(NOMA) can be adopted. NOMA provides several opportunities for cellular-connected UAVs such as larger rate region, balanced performance between system throughput and fairness, and reduced delay. In this paper, we review important findings of the related studies, and outline new opportunities and challenges in NOMA for cellular-connected UAVs. Monte-Carlo simulations are then performed to analyze the new aerial user’s(AU)’s signal characteristics and evaluate the NOMA performance for co-existence of AU and terrestrial user(TU). Our preliminary results show that NOMA is a promising strategy for cellular-connected UAVs.

关键词： cellular-connected UAVs non-orthogonal multiple access signal characteristics aerial user rate terrestrial user rate

Spectrum and energy efficient multi-antenna spectrum sensing for green UAV communication

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Digital Communications and Networks 2023年第4期9卷 846-855页

作者： Junlin Zhang Mingqian Liu Nan Zhao Yunfei Chen Qinghai Yang zhiguo ding State Key Laboratory of Integrated Service Networks Xidian UniversityShaanxiXi'an710071China School of Information and Communication Engineering Dalian University of TechnologyDalian116024China Department of Engineering University of DurhamDurhamDH13LEUK School of Electrical and Electronic Engineering University of ManchesterManchesterUK

Unmanned Aerial Vehicle(UAV)communication is a promising technology that provides swift and flexible ondemand wireless connectivity for devices without infrastructure *** recent developments in UAVs,spectrum and energy efficient green UAV communication has become *** deal with this issue,Spectrum Sharing Policy(SSP)is introduced to support green UAV *** sensing in SSP must be carefully formulated to control interference to the primary users and ground *** this paper,we propose spectrum sensing for opportunistic spectrum access in green UAV communication to improve the spectrum utilization *** from most existing works,we focus on the problem of spectrum sensing of randomly arriving primary signals in the presence of non-Gaussian noise/*** propose a novel and improved p-norm-based spectrum sensing scheme to improve the spectrum utilization efficiency in green UAV ***,we construct the p-norm decision statistic based on the assumption that the random arrivals of signals follow a Poisson ***,we analyze and derive the approximate analytical expressions of the false-alarm and detection probabilities by utilizing the central limit *** results illustrate the validity and superiority of the proposed scheme when the primary signals are corrupted by additive non-Gaussian noise and arrive randomly during spectrum sensing in the green UAV communication.

关键词： Green communication Multi-antenna spectrum sensing Non-Gaussian noise Unmanned aerial vehicle communication

A Security Enhancement Model Based on Switching Edge Strategy in Interdependent Heterogeneous Cyber-Physical Systems

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China Communications 2022年第2期19卷 158-173页

作者： Dandan Zhao Can Liu Guangquan Xu zhiguo ding Hao Peng Juan Yu Jianmin Han Zhejiang Normal University Jinhua 321004China Qingdao Huanghai University Qingdao 266427China Tianjin University Tianjin 300350China Key Laboratory of Intelligent Education Technology and Application of Zhejiang Province Zhejiang Normal UniversityJinhua 321004China

With the advent of cross-domain interconnection,large-scale sensor network systems such as smart grids,smart homes,and intelligent transportation have *** complex network systems often have a CPS(Cyber-Physical System)architecture and are usually composed of multiple interdependent *** faults between interdependent networks may cause serious cascading failures between the entire ***,in this paper,we will explore the robustness detection schemes for interdependent ***,by calculating the largest giant connected component in the entire system,the security of interdependent network systems under different attack models is ***,a comparative analysis of the cascade failure mechanism between interdependent networks under the edge enhancement strategy is carried ***,the simulation results verify the impact of system reliability under different handover edge strategies and show how to choose a better handover strategy to enhance its *** further research work in this paper can also help design how to reduce the interdependence between systems,thereby further optimizing the interdependent network system’s structure to provide practical support for reducing the cascading *** the later work,we hope to explore our proposed strategies in the network model of real-world or close to real networks.

关键词： security enhancement switching edge strategy interdependent systems cyber-physical systems

Achievable secrecy rate of bit-interleaved coded modulation schemes

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Journal of Modern Transportation 2012年第4期20卷 243-248页

作者： Weichen XIANG Stéphane Le Goff zhiguo ding School of Electrical and Electronic Engineering Newcastle University

We study the impact of various modulation mapping strategies and signal constellation shapes on the se- crecy rates achievable with bit-interleaved coded modulation （BICM） schemes. Transmission over an ergodic Rayleigh fading channel is assumed throughout this work. Various constellations and mapping techniques are considered in this work to maximize the capacity difference between the main channel and the eavesdropper channel, rather than to opti- mize the capacity of both channels. We show that in terms of achievable secrecy rate, Gray and Quasi-Gray mappings only perform Well at low SNR but outperformed by other mapping techniques when SNR increases. The proper design of signal mapping can significantly enhance the achievable secrecy rate in BICM schemes. It is indicated that the key parameter to the secrecy rate of a BICM system is the distance spectrum of Euclidean distances for mappings.

关键词： secrecy capacity mapping ergodic fading channel bit-interleaved coded modulation

A full-cooperative diversity beamforming scheme in two-way amplify-and-forward relay systems

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Digital Communications and Networks 2015年第1期1卷 57-67页

作者： Zhongyuan Zhao zhiguo ding Mugen Peng Yong Li Key Laboratory of Universal Wireless Communications (Ministry of Education) Beijing University of Posts and Telecommunications School of Computing and Communications Lancaster University

Consider a simple two-way relaying channel in which two single-antenna sources exchange information via a multiple-antenna relay. For such a scenario, all the existing approaches that can achieve full cooperative diversity order are based on antenna/relay selection, for which the difficulty in designing the beamforming lies in the fact that a single beamformer needs to serve two destinations. In this paper, a new full-cooperative diversity beamforming scheme that ensures that the relay signals are coherently combined at both destinations is proposed, and analytical results are provided to demonstrate the performance gains. Moreover, the impact of channel estimation error is also evaluated. Finally, numerical results are provided to verify the accuracy of the provided analytical results, and also to show that this proposed scheme can outperform existing schemes based on antenna selection.

关键词： Two-way relay systems Beamforming Network coding Amplify-and-forward Cooperative diversity Outage probability