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Scavenging Microwave Wireless Power:A Unified Model,Rectenna Design Automation,and Cutting-Edge Techniques

Engineering 2023年第11期30卷 32-48页

作者： Si-Ping Gao Jun-Hui Ou xiuyin zhang Yongxin Guo Department of Electrical and Computer Engineering National University of SingaporeSingapore 117576Singapore School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510641China School of Future Technology South China University of TechnologyGuangzhou 511442China

While sufficient review articles exist on inductive short-range wireless power transfer(WPT),long-haul microwave WPT(MWPT)for solar power satellites,and ambient microwave wireless energy harvesting(MWEH)in urban areas,few studies focus on the fundamental modeling and related design automation of receiver *** article reviews the development of MWPT and MWEH receivers,with a focus on rectenna design automation.A novel rectifier model capable of accurately modeling the rectification process under both high and low input power is *** model reveals the theoretical boundary of radio frequency-to-direct current(dc)power conversion efficiency and,most importantly,enables an automated system *** automated rectenna design flow is sequential,with the minimal engagement of iterative *** covers the design automation of every module(i.e.,rectifiers,matching circuits,antennae,and dc–dc converters).Scaling-up of the technique to large rectenna arrays is also possible,where the challenges in array partitioning and power combining are briefly *** addition,several cutting-edge rectenna techniques for MWPT and MWEH are reviewed,including the dynamic range extension technique,the harmonics-based retro-directive technique,and the simultaneous wireless information and power transfer technique,which can be good complements to the presented automated design methodology.

关键词： Microwave wireless power transfer Microwave wireless energy harvesting Unified Rectifier model Automated rectenna design Emerging rectenna techniques

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A Ku-band image-rejection filtering LNA MMIC in 150-nm GaN-on-SiC technology

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Science China(Information Sciences) 2024年第1期67卷 318-319页

作者： Huiyang LI Jinxu XU xiuyin zhang School of Electronic and Information Engineering South China University of Technology School of Microelectronics South China University of Technology

The low noise amplifier (LNA) is one of the most important circuits in the transceiver. Many high-performance LNAs have been demonstrated based on Ga N processes. For instance, by using a hybrid-matching topology with...

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Energy-efficient design for mmW ave-enabled NOMA-UAV networks

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Science China(Information Sciences) 2021年第4期64卷 40-53页

作者： Xiaowei PANG Jie TANG Nan ZHAO xiuyin zhang Yi QIAN School of Information and Communication Engineering Dalian University of Technology School of Electronic and Information Engineering South China University of Technology Department of Electrical and Computer Engineering University of Nebraska-Lincoln

Owing to the recent advances of non-orthogonal multiple access(NOMA) and millimeter-wave(mmWave), these two technologies are combined in unmanned aerial vehicle(UAV) networks in this ***, energy efficiency has become a significant metric for UAVs owning to their limited energy. Thus, we aim to maximize the energy efficiency for mmWave-enabled NOMA-UAV networks by optimizing the UAV placement, hybrid precoding and power allocation. However, the optimization problem is complicated and intractable, which is decomposed into several sub-problems. First, we solve the UAV placement problem by approximating it into a convex one. Then, the hybrid precoding with user clustering is performed to better reap the multi-antenna gain. Particularly, three schemes are proposed, where the cluster head selection algorithm is adopted while considering different equivalent channels of users. Finally, the power allocation is optimized to maximize the energy efficiency, which is converted to convex and solved via an iterative algorithm. Simulation results are provided to evaluate the performance of the proposed schemes.

关键词： energy efficiency hybrid precoding millimeter-wave non-orthogonal multiple access placement optimization power allocation unmanned aerial vehicle

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Time and energy efficient data collection via UAV

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Science China(Information Sciences) 2022年第8期65卷 182-196页

作者： Tianhao WANG Xiaowei PANG Jie TANG Nan ZHAO xiuyin zhang Xianbin WANG School of Information and Communication Engineering Dalian University of Technology Department of Electrical and Computer Engineering Western University School of Electronic and Information Engineering South China University of Technology

Using unmanned aerial vehicles(UAVs) for data collection has emerged as a promising technique to achieve both time-and energy-efficient data gathering while keeping data fresh. In this study, two schemes are proposed for flight cycle minimization and energy efficiency maximization to collect data from ground sensors. We first minimize the flight cycle by jointly optimizing the wake-up scheduling of sensors, the trajectory,and the time slot, which is a mixed-integer non-convex problem and difficult to solve directly. To this end,we propose an iterative algorithm based on block coordinate descent and successive convex approximation to decouple the original non-convex problem into two sub-problems and the constraints are turned to be convex approximately. Furthermore, the energy efficiency is maximized since the limited energy is a critical issue in UAV communication systems. We approximate the two subproblems as convex optimizations by introducing slack variables and applying SCA. The approximate energy efficiency is a fractional expression, and we use Dinkelbach’s method to solve it. Numerical results show that the flight cycle is minimized in the first scheme with the data requirement satisfied, while in the second scheme, the energy efficiency is maximized with the trade-off between the transmission data and the propulsion power consumption.

关键词： data collection energy efficiency maximization time minimization trajectory optimization unmanned aerial vehicle (UAV)

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Transmit Power Minimization for IRS-Assisted NOMA-UAV Networks

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China Communications 2024年第5期21卷 137-152页

作者： Zhao Chen Pang Xiaowei Tang Jie Liu Mingqian Zhao Nan zhang xiuyin Wang Xianbin School of Information and Communication Engineering Dalian University of TechnologyDalian 116024China School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China Department of Electrical and Computer Engineering Western UniversityLondonON N6A 5B9Canada

The flexibility of unmanned aerial vehicles(UAVs)allows them to be quickly deployed to support ground *** reflecting surface(IRS)can reflect the incident signal and form passive beamforming to enhance the signal in the specific *** by the promising benefits of both technologies,we consider a new scenario in this paper where a UAV uses non-orthogonal multiple access to serve multiple users with *** to their distance to the UAV,the users are divided into the close users and remote *** UAV hovers above the close users due to their higher rate requirement,while the IRS is deployed near the remote users to enhance their received *** aim at minimizing the transmit power of UAV by jointly optimizing the beamforming of UAV and the phase shift of IRS while ensuring the decoding ***,the problem is ***,we decompose it into two sub-problems,including the transmit beamforming optimization and phase shift optimization,which are transformed into second-order cone programming and semidefinite programming,*** propose an iterative algorithm to solve the two sub-problems *** results prove the effectiveness of the proposed scheme in minimizing the transmit power of UAV.

关键词： intelligent reflecting surface nonorthogonal multiple access phase shift optimization transmit beamforming optimization unmanned aerial vehicle

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NOMA-Based UAV-Aided Networks for Emergency Communications

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China Communications 2020年第11期17卷 54-66页

作者： Wanmei Feng Jie Tang Nan Zhao Yuli Fu xiuyin zhang Kanapathippillai Cumanan Kai-Kit Wong South China University of Technology Guangzhou 510000China Dalian University of Technology Dalian 116000China University of York York YO105DDU.K University College London London WC1E 6BTU.K

High spectrum efficiency(SE)requirement and massive connections are the main challenges for the fifth generation(5G)and beyond 5G(B5G)wireless networks,especially for the case when Internet of Things(IoT)devices are located in a disaster ***-orthogonal multiple access(NOMA)-based unmanned aerial vehicle(UAV)-aided network is emerging as a promising technique to overcome the above *** this paper,an emergency communications framework of NOMA-based UAV-aided networks is established,where the disasters scenarios can be divided into three broad categories that have named emergency areas,wide areas and dense ***,a UAV-enabled uplink NOMA system is established to gather information from IoT devices in emergency ***,a joint UAV deployment and resource allocation scheme for a multi-UAV enabled NOMA system is developed to extend the UAV coverage for IoT devices in wide ***,a UAV equipped with an antenna array has been considered to provide wireless service for multiple devices that are densely distributed in disaster *** results are provided to validate the effectiveness of the above three ***,potential research directions and challenges are also highlighted and discussed.

关键词： emergency communications non-orthogonal multiple access(NOMA) Internet of Things(IoT) trajectory optimization unmanned aerial vehicle(UAV)

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Multibeam Antenna Based on Butler Matrix for 3G/LTE/5G/B5G Base Station Applications

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ZTE Communications 2020年第3期18卷 12-19页

作者： YE Lianghua CAO Yunfei zhang xiuyin School of Physics and Optoelectronic Engineering Guangdong University of Technology School of Electronic and Information Engineering South China University of Technology

With the rapid development of mobile communication technology and the explosion of data traffic, high capacity communication with high data transmission rate is urgently needed in densely populated areas. Since multibeam antennas are able to increase the communication capacity and support a high data transmission rate, they have attracted a lot of research interest and have been actively investigated for base station applications. In addition, since multi-beam antennas based on Butler matrix(MABBMs) have the advantages of high gain,easy design and low profile, they are suitable for base station applications. The purposes of this paper is to provide an overview of the existing MABBMs. The specifications, principles of operation, design method and implementation of MABBMs are presented. The challenge of MABBMs for 3G/LTE/5G/B5G base station applications is discussed in the end.

关键词： multi-beam antenna base station application Butler matrix wideband antenna multi-band antenna

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Low-Profile Multi-Polarization and Pattern Reconfigurable Antenna Based on Metasurface

Low-Profile Multi-Polarization and Pattern Reconfigurable An...

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2023年全国天线年会

作者： Jiajun Liang Long Li xiuyin zhang Hua Yang South China University of Technology Yulin Normal University

In this article,a low-profile metasurface antenna,with polarization and radiation pattern reconfigurable ability,is *** antenna consists of three parts,including the bottom horizontal loop antenna layer,the middle aperture-coupled feeding layer,and the top metasurface *** controlling the RF switch embedded in the bottom layer,the main radiated element of the antenna would work in the loop antenna or *** a result,the radiation pattern of the antenna would switch between omnidirectionality or ***,when the antenna works in directional radiation mode,the antenna can obtain a polarization reconfigurable ability by mechanically rotating the ***,the antenna can operate in horizontal linear polarization(HLP),vertical linear polarization(VLP),right-hand circular polarization(RHCP),and left-hand circular polarization(LHCP).It obtains a-10 dB impedance bandwidth of 34.5%,19.5%,and 26.9% for HLP,VLP,and CP modes,*** addition,the antenna has a 3 dB axial ratio(AR) bandwidth of 10.5% for CP modes and a low profile of 0.06λ(at center operating frequency 3.3 GHz).

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无人机辅助多用户毫米波MIMO系统的透镜波束预编码技术研究

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电子与信息学报 2022年第3期44卷 844-851页

作者：陈真唐杰杜晓宇章秀银华南理工大学电子与信息学院广州510641

无人机(UAV)与毫米波(mmWave)多输入多输出(MIMO)系统的结合可以提供高数据速率的空中链路,然而其部署位置及波束赋形设计直接影响无线通信系统的吞吐量。为实现多用户同时接入通信,该文提出基于离散透镜阵列(DLA)结构的波束空间预编码... 详细信息

无人机(UAV)与毫米波(mmWave)多输入多输出(MIMO)系统的结合可以提供高数据速率的空中链路,然而其部署位置及波束赋形设计直接影响无线通信系统的吞吐量。为实现多用户同时接入通信,该文提出基于离散透镜阵列(DLA)结构的波束空间预编码技术,构建了联合UAV飞行高度、波束选择及混合预编码的优化方案。为了解决这一涉及随机目标函数的非凸优化问题,该文利用最小化加权最小均方误差方法,将问题转化为求一系列子优化问题,进而通过一种惩罚对偶分解(PDD)算法求解。数值仿真结果表明,该方案能够实现接近全数字波束赋形方案的频谱效率性能。

关键词：无人机毫米波通信 MIMO 混合预编码透镜天线阵列

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基于多模介质谐振器的高集成单体双路滤波电路

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重庆邮电大学学报(自然科学版) 2020年第5期32卷 698-706页

作者：徐金旭章秀银华南理工大学电子与信息学院

针对传统设计中,基站系统存在多个高Q值、高功率容限的介质滤波器而导致体积大、重量大和成本高等问题,提出了单体双路滤波电路设计方法,将2个滤波器或滤波电路集成为单个具有2个输入端口和2个输出端口的电路。通过充分利用多模介质谐... 详细信息

针对传统设计中,基站系统存在多个高Q值、高功率容限的介质滤波器而导致体积大、重量大和成本高等问题,提出了单体双路滤波电路设计方法,将2个滤波器或滤波电路集成为单个具有2个输入端口和2个输出端口的电路。通过充分利用多模介质谐振器的电磁场特性,仅使用一个金属腔和介质谐振器就实现2个具有相同性能的滤波通道。尽管集成后的2个信号通道共用一个谐振器,通道间也能实现大于20 dB的高隔离效果。介绍了包括单体双路滤波器及其与双输入双输出Doherty功率放大器的协同融合、单体双路平衡式滤波器和单体双路巴伦滤波器等电路的设计方法。提出的单体双路滤波电路可以替代传统设计方法中的2个独立滤波电路,从而减少无线系统中滤波电路的数量,实现高集成和小型化。

关键词：介质谐振器滤波器单体双路多功能电路滤波功率放大器平衡式滤波器巴伦滤波器

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