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Intelligent Reflecting Surface Assisted Transmission Optimization Strategies in Wireless Networks
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作者 He Xinxin Qi Xuan +2 位作者 Meng Wei Liu Wei Yin Changchuan 《China Communications》 SCIE CSCD 2024年第4期120-135,共16页
Wireless Power Transfer(WPT)technology can provide real-time power for many terminal devices in Internet of Things(IoT)through millimeterWave(mmWave)to support applications with large capacity and low latency.Although... Wireless Power Transfer(WPT)technology can provide real-time power for many terminal devices in Internet of Things(IoT)through millimeterWave(mmWave)to support applications with large capacity and low latency.Although the intelligent reflecting surface(IRS)can be adopted to create effective virtual links to address the mmWave blockage problem,the conventional solutions only adopt IRS in the downlink from the Base Station(BS)to the users to enhance the received signal strength.In practice,the reflection of IRS is also applicable to the uplink to improve the spectral efficiency.It is a challenging to jointly optimize IRS beamforming and system resource allocation for wireless energy acquisition and information transmission.In this paper,we first design a Low-Energy Adaptive Clustering Hierarchy(LEACH)clustering protocol for clustering and data collection.Then,the problem of maximizing the minimum system spectral efficiency is constructed by jointly optimizing the transmit power of sensor devices,the uplink and downlink transmission times,the active beamforming at the BS,and the IRS dynamic beamforming.To solve this non-convex optimization problem,we propose an alternating optimization(AO)-based joint solution algorithm.Simulation results show that the use of IRS dynamic beamforming can significantly improve the spectral efficiency of the system,and ensure the reliability of equipment communication and the sustainability of energy supply under NLOS link. 展开更多
关键词 intelligent reflecting surface(IRS) joint optimization millimeter wave wireless information transmission(WIT) wireless power transfer(wpt)
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On Differentiation Among Pilot Signals of Multiple Mobile Targets in Retro-Reflective Beamforming for Wireless Power Transmission
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作者 Xin Wang Long Li +1 位作者 Tie Jun Cui Mingyu Lu 《Engineering》 SCIE EI CAS CSCD 2023年第11期55-62,共8页
An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers(referred to herein as“targets”).The experimental results demons... An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers(referred to herein as“targets”).The experimental results demonstrate that,when multiple targets broadcast continuous-wave pilot signals at respective frequencies,a retro-reflective wireless power transmitter is capable of generating multiple wireless power beams aiming at the respective targets as long as the multiple pilot signals are explicitly separated from one another by the wireless power transmitter.However,various practical complications are identified when the pilot signals of multiple targets are not appropriately differentiated from each other by the wireless power transmitter.Specifically,when multiple pilot signals are considered to be carried by the same frequency,the wireless power transmission performance becomes heavily dependent on the interaction among the pilot signals,which is highly undesirable in practice.In conclusion,it is essential for a retro-reflective wireless power transmitter to explicitly discriminate multiple targets’pilot signals among each other. 展开更多
关键词 wireless power transmission Microwave antenna array Retro-reflective beamforming Pilot signal Multiple access
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Highlights in recent wireless power IC research
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作者 Cheng Huang Junyao Tang 《Journal of Semiconductors》 EI CAS CSCD 2024年第4期5-7,共3页
Wireless power transfer(WPT)has been a popular topic in power integrated circuit(IC)designs in the past decade.As slogan"cutting the last wire"presented in ISSCC’15[1],WPT is poised to take over many wired ... Wireless power transfer(WPT)has been a popular topic in power integrated circuit(IC)designs in the past decade.As slogan"cutting the last wire"presented in ISSCC’15[1],WPT is poised to take over many wired power deliveries applica-tions today,just like what happened to wireless communica-tion nowadays.Over the years,WPT has become more mature and more wirelessly charged or powered products have become available on the market.This mini review intends to summarize recent breakthroughs in WPT inte-grated circuits(IC)research. 展开更多
关键词 wpt power wireless
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Power Line Monitoring Data Transmission Using Wireless Sensor Network 被引量:4
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作者 Lifen Li Huaiyu Zhao 《Journal of Power and Energy Engineering》 2015年第8期83-88,共6页
The WSN used in power line monitoring is long chain structure, and the bottleneck near the Sink node is more obvious. In view of this, A Sink nodes’ cooperation mechanism is presented. The Sink nodes from different W... The WSN used in power line monitoring is long chain structure, and the bottleneck near the Sink node is more obvious. In view of this, A Sink nodes’ cooperation mechanism is presented. The Sink nodes from different WSNs are adjacently deployed. Adopting multimode and spatial multiplexing network technology, the network is constructed into multi-mode-level to achieve different levels of data streaming. The network loads are shunted and the network resources are rationally utilized. Through the multi-sink nodes cooperation, the bottlenecks at the Sink node and its near several jump nodes are solved and process the competition of communication between nodes by channel adjustment. Finally, the paper analyzed the method and provided simulation experiment results. Simulation results show that the method can solve the funnel effect of the sink node, and get a good QoS. 展开更多
关键词 wireless Sensor NETWORK (WSN) power Line Monitoring Data transmission MULTIMODE NETWORK
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Design and Optimization of Inductive Wireless Power Transmission System 被引量:1
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作者 Xiaoke Ding 《Modern Electronic Technology》 2018年第1期15-21,共7页
The inductive wireless power transmission system is actually applied to the principle of magnetic field coupling, com- bined with the flexibility of the electrical equipment to achieve flexible and safe power supply. ... The inductive wireless power transmission system is actually applied to the principle of magnetic field coupling, com- bined with the flexibility of the electrical equipment to achieve flexible and safe power supply. In the realization process of wird^ power transmission, the key point lies in the transmission efficiency and power transmission capability. However, wireless trans-mission still has some disadvantages in these two aspects. In this case, there is an air gap between the transmitting winding and the receiving winding. If it is too large and the coupling coefficient is too low, in view of this situation, it is necessary to carry out re-search from aspects such as raising the coupling coefficient and controlling the air gap. The article firstly describes the development ofwireless power transmission technology and transmission principles, etc. Secondly, it analyzes the output control ofwireless power fransmission systems. Uird,it conducts simulation analysis using loosely coupling transfomers and proposes an optimized solution. The simulation design and inspection process were proposed. The main purpose of this paper is to analyze the current wireless energy transmission system and clarify the direction in which it should be strengthened. The significance of this study is to provide a feasible direction for the further optimization of the wireless energy transmission system. 展开更多
关键词 INDUCTIVE wireless power transmission SYSTEM OPTIMIZATION
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Secure Transmission Scheme Based on Dual-Thresholds for Simultaneous Wireless Information and Power Transfer 被引量:1
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作者 Xin Hu Kaizhi Huang +2 位作者 Yajun Chen Liang Jin Yunjia Xu 《China Communications》 SCIE CSCD 2017年第12期25-44,共20页
This paper studies a simultaneous wireless information and power transfer system with multiple external eavesdroppers and internal curious users.We model the random network by Poisson cluster process in consideration ... This paper studies a simultaneous wireless information and power transfer system with multiple external eavesdroppers and internal curious users.We model the random network by Poisson cluster process in consideration of the case where eavesdroppers hide around certain targets.Focusing on the users that work in harvesting-transmitting mode with time switching receivers,we establish communication model via time division multiple access.On this basis,we propose a lightweight secure transmission scheme based on dual-thresholds for physical-layer security enhancement,which consists of two protocols applied to the downlink(DL) and uplink(UL) transmission respectively.In the DL,we design a dynamic information-power switching transmission protocol based on signal-to-noise ratio threshold,which provides an opportunistic approach to reform the fixed period allocation of information and power transfer;in the UL,an energy threshold is proposed for users to control the transmission,which is called a user-led on-off transmission protocol.Furthermore,we give a comprehensive performance analysis for the proposed scheme in terms of delay,reliability,security and secrecy throughput.Based on the analysis results,we optimize the two thresholds and the DL-UL allocationcoefficient to maximize the secrecy throughput.Simulation results show the proposed scheme can bring about a substantial secrecy gain. 展开更多
关键词 physical layer security simultane-ous wireless INFORMATION and power transfer OPPORTUNISTIC approach on-offtransmission
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Battery Charger for Electric Vehicles based on a Wireless Power Transmission 被引量:2
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作者 Paolo Germano Yves Perriard 《CES Transactions on Electrical Machines and Systems》 2017年第1期66-71,共6页
In this paper,the case of a battery charger for electric vehicles based on a wireless power transmission is addressed.The specificity of every stage of the overall system is presented.Based on calculated and measured ... In this paper,the case of a battery charger for electric vehicles based on a wireless power transmission is addressed.The specificity of every stage of the overall system is presented.Based on calculated and measured results,relevant capacitive compensations of the transformer and models are suggested and discussed in order to best match the operating mode and aiming at simplifying as much as possible the control and the electronics of the charger. 展开更多
关键词 Battery charge battery model control strategy converter topologies electric vehicle non-linear load SHIELDING wireless power transmission.
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Theoretical Design of Energy Harvesting Module or Wireless Power Transmission Receiver Using Magnetic Field of 0.2 mT at 60 Hz 被引量:1
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作者 Kunihisa Tashiro Hiroyuki Wakiwaka Yu Uchiyama 《Journal of Energy and Power Engineering》 2013年第4期740-745,共6页
This paper presents a theoretical design method for a magnetic energy harvesting module. This module consists of an air-core coil and resonant capacitor. With a simple RLC circuit model, it can derive an equation of h... This paper presents a theoretical design method for a magnetic energy harvesting module. This module consists of an air-core coil and resonant capacitor. With a simple RLC circuit model, it can derive an equation of harvesting energy as a function of coil size. In order to demonstrate the magnetic field, a uniform magnetic field is generated by the developed coil system. From the experimented results, it is successfully demonstrated 100 mW of energy harvesting from a magnetic field of 0.09 mT at 60 Hz. This value is in good agreement with the estimated results. Harvested energy is proportional to the square of the magnetic flux density. However, ICNIRP2010 provides a guideline that an acceptable level for human health in a public space is 0.2 mT at power-line frequency. This paper also discuss the possibilities of several applications related with both magnetic energy harvesting and wireless power transmission. 展开更多
关键词 Magnetic energy harvesting wireless power transmission theoretical design ICNIRP2010.
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Retro-reflective Beamforming Technique with Applications in Wireless Power Transmission
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作者 WANG Xin LU Mingyu 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2019年第4期545-565,共21页
Retro reflective beamforming technique has the potential of enabling efficient wireless power transmission over long distance(on the order of meters and even kilometers).In retro reflective beamforming,wireless power ... Retro reflective beamforming technique has the potential of enabling efficient wireless power transmission over long distance(on the order of meters and even kilometers).In retro reflective beamforming,wireless power transmission is guided by pilot signal:Based upon pilot signal broadcasted by a wireless power receiver,a wireless power transmitter delivers focused microwave power beam(s)onto the location of wireless power receiver.When the wireless power receiver’s location is not fixed or when the wireless power receiver’s location is unknown to the wireless power transmitter,the microwave power beam would follow the wireless power receiver’s location dynamically as long as the wireless power receiver broadcasts pilot signal periodically.This paper reviews our research endeavors in recent years on retro reflective beamforming technique targeting three applications:(1)wireless charging for low power mobile/portable electronic devices,(2)space solar power satellites(SSPS)application,and(3)wireless charging in fully enclosed space.The feasibility and potential of retro reflective beamforming technique with applications in wireless power transmission are demonstrated by some preliminary experimental results. 展开更多
关键词 wireless power transmission retro⁃reflective beamforming MICROWAVE antenna array pilot signal
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Wireless Power Transmission into Metallic Tube Using Axial Slit for Infrastructure Diagnostics
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作者 Kohei Shimamura Kimiya Komurasaki 《Wireless Engineering and Technology》 2015年第3期50-60,共11页
Wireless power transfer (WPT) using a metallic tube with axial slits was attempted to demonstrate WPT using magnetic resonance coupling to the diagnostics infrastructure. The transmission efficiency was measured at va... Wireless power transfer (WPT) using a metallic tube with axial slits was attempted to demonstrate WPT using magnetic resonance coupling to the diagnostics infrastructure. The transmission efficiency was measured at various distances using the transmission and receiver resonator in the tube. Furthermore, the transmission and receiver resonator were set respectively outside and inside of the tube. Experiment results were assessed computationally using the finite-difference time-domain (FDTD) simulation. As a result, the transmission efficiency of the transmitter and receiver resonators in the metallic slit tube was higher than that of the case without a metallic tube in the range of the normalized transmission-distance of x/d > 0.4. In the simulation, the current density on the metallic tube around both transmitter and receiver coil were connected. These results reveal that the slit on the tube plays a role of the relay coil. 展开更多
关键词 wireless power transmission Magnetic RESONANCE COUPLING INFRASTRUCTURE DIAGNOSTICS
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Wireless Power Transmission with Short and Long Range Using Inductive Coil
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作者 Manish Bhardwaj Anil Ahlawat 《Wireless Engineering and Technology》 2018年第1期1-9,共9页
In today’s time each individual needs remote framework, yet at the same time control transmission for low power gadgets are wired in nature. Consistent power supply is one of the real issues in the motivation behind ... In today’s time each individual needs remote framework, yet at the same time control transmission for low power gadgets are wired in nature. Consistent power supply is one of the real issues in the motivation behind the utilization of remote sensor network. Yet, in the power arrangement of remote Sensor Network, the battery has an extremely constrained lifetime and is not supplanted yet by some other persistent power framework. There are separate techniques proposed for shorter and more separate power transmission: Inductive coupling, resonant inductive coupling and air ionization for short separations;microwave and Laser transmission for longer separations. The pioneer of the field, Tesla endeavoured to make a capable, remote electric transmitter more than a century back that has now observed an exponential development. This paper overall lights up all the effective strategies proposed for transmitting power without wires. This study is important for find out the future ways of power transmission. These methods are so important in today’s world because of drastic wastage of power. Common wireless power transmission is a point-to-point control transmission. It was demonstrated that the power transmission effectiveness could approach near 100%. 展开更多
关键词 WSN wireless power Non-Radiative REMOTE transmission
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Optimal Design of Wireless Power Transmission Systems Using Antenna Arrays
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作者 SUN Shuyi WEN Geyi 《ZTE Communications》 2022年第2期19-27,共9页
Three design methods for wireless power transmission(WPT)systems using antenna arrays have been investigated.The three methods,corresponding to three common application scenarios of WPT systems,are based on the method... Three design methods for wireless power transmission(WPT)systems using antenna arrays have been investigated.The three methods,corresponding to three common application scenarios of WPT systems,are based on the method of maximum power transmission efficiency(MMPTE)between two antenna arrays.They are unconstrained MMPTE,weighted MMPTE,and constrained MMPTE.To demonstrate the optimal design process with the three methods,a WPT system operating at 2.45 GHz is designed,simulated,and fabricated,in which the transmitting(Tx)array,consisting of 36 microstrip patch elements,is configured as a square and the receiving(Rx)array,consisting of 5 patch elements,is configured as an L shape.The power transmission efficiency(PTE)is then maximized for the three application scenarios,which yields the maximum possible PTEs and the optimized distributions of excitations for both Tx and Rx arrays.The feeding networks are then built based on the optimized distributions of excitations.Simulations and experiments reveal that the unconstrained MMPTE,which corresponds to the application scenario where no radiation pattern shaping is involved,yields the highest PTE.The next highest PTE belongs to the weighted MMPTE,where the power levels at all the receiving elements are imposed to be equal.The constrained MMPTE has the lowest PTE,corresponding to the scenario in which the radiated power pattern is assumed to be flat along with the Rx array. 展开更多
关键词 wireless power transmission system antenna arrays antenna pattern synthesis feeding network
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A Radio⁃Frequency Loop Resonator for Short⁃Range Wireless Power Transmission
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作者 WANG Xin LI Wenbo LU Mingyu 《ZTE Communications》 2022年第2期43-47,共5页
A microstrip loop resonator loaded with a lumped capacitor is proposed for short-range wireless power transmission applications.The overall physical dimensions of the proposed loop resonator configuration are as small... A microstrip loop resonator loaded with a lumped capacitor is proposed for short-range wireless power transmission applications.The overall physical dimensions of the proposed loop resonator configuration are as small as 3 cm by 3 cm.Power transmission efficiency of greater than 80%is achieved with a power transmission distance smaller than 5 mm via the strong coupling between two loop resonators around 1 GHz,as demonstrated by simulations and measurements.Experimental results also show that the power transmission performance is insensitive to various geometrical misalignments.The numerical and experimental results of this paper reveal a bandwidth of more than 50 MHz within which the power transmission efficiency is above 80%.As a result,the proposed microstrip loop resonator has the potential to accomplish efficient wireless power transmission and high-speed(higher than 10 Mbit/s)wireless communication simultaneously. 展开更多
关键词 loop resonator lumped capacitive loading radio frequency short-range wireless power transmission
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基于交互式设计超材料建模与分析的MCR-WPT效率提升研究
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作者 范兴明 张浩楠 张鑫 《上海交通大学学报》 EI CAS CSCD 北大核心 2024年第4期545-554,共10页
超材料具有特殊的磁场调控能力,被广泛关注并应用于磁耦合谐振无线电能传输(MCR-WPT)领域,但寻求针对特定领域目标需求的超材料设计具有挑战性.目前,超材料的一般设计方法为S参数反演法和等效电路法,设计流程通常需要多次建模仿真得到... 超材料具有特殊的磁场调控能力,被广泛关注并应用于磁耦合谐振无线电能传输(MCR-WPT)领域,但寻求针对特定领域目标需求的超材料设计具有挑战性.目前,超材料的一般设计方法为S参数反演法和等效电路法,设计流程通常需要多次建模仿真得到目标参数,该过程较为繁琐耗时.对此,深入分析上述两种设计方法的特性并将二者结合,采用HFSS与MATLAB软件交互设计和优化用于MCR-WPT特性提升的超材料,有效简化了超材料的设计过程.以无线电能传输效率优化为目标设计方形和Koch两种超材料单元,分析对比两种单元的电磁特性.搭建工作频率为6.78 MHz的MCR-WPT系统实验平台,探究两种超材料对传输效率的影响.实验结果表明,方形超材料和Koch超材料分别实现了28.4%和24.6%的最大传输效率提升,证明了交互设计可以更简便地设计超材料并且用于无线电能传输系统传输效率的提升. 展开更多
关键词 无线电能传输 超材料 分析和设计 交互式仿真 传输效率
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双耦合SP-S补偿紧凑型抗偏移WPT系统
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作者 谢文燕 陈为 +1 位作者 陈庆彬 江彦伟 《中国电机工程学报》 EI CSCD 北大核心 2024年第2期714-724,I0024,共12页
在无线电能传输(wireless power transfer,WPT)系统中,偏移是不可避免的,偏移会引起系统参数的变化从而影响系统的传输性能。基于S-S和P-S补偿拓扑,提出一种具有抗偏移特性的双耦合SP-S补偿的紧凑型WPT系统。该系统采用两个同轴布置、... 在无线电能传输(wireless power transfer,WPT)系统中,偏移是不可避免的,偏移会引起系统参数的变化从而影响系统的传输性能。基于S-S和P-S补偿拓扑,提出一种具有抗偏移特性的双耦合SP-S补偿的紧凑型WPT系统。该系统采用两个同轴布置、相互解耦的圆角方形线圈作为能量的发射线圈,其与单一方形接收线圈均有耦合,提升了X方向和Y方向的抗偏移容忍度。通过谐振参数配置使接收线圈在偏移的过程中,一个线圈回路的输出增加,另一个线圈回路输出减少,从而使系统输出随接收线圈位置偏移波动平缓。提出方形解耦线圈结构参数的设计方法,并分析发射端并联补偿电容对输出抗偏移性能的影响。最后,搭建实验平台验证该方法的有效性与系统的抗偏移能力。 展开更多
关键词 抗偏移 无线电能传输 解耦线圈 双耦合
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电动汽车多车位WPT下沉式磁屏蔽系统研究
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作者 张学毅 任立权 +3 位作者 熊鑫博 孔彭生 李中启 杨民生 《电工电能新技术》 CSCD 北大核心 2024年第4期76-85,共10页
在电动汽车无线电能传输系统中,实现高效传输的同时减少磁泄漏一直是一个技术挑战。针对这一问题,本文提出了一种应用于多无线电能传输系统的下沉式屏蔽线圈结构,该结构在减小目标面漏磁的同时不会影响系统的传输效率。首先,提出了一种... 在电动汽车无线电能传输系统中,实现高效传输的同时减少磁泄漏一直是一个技术挑战。针对这一问题,本文提出了一种应用于多无线电能传输系统的下沉式屏蔽线圈结构,该结构在减小目标面漏磁的同时不会影响系统的传输效率。首先,提出了一种基于矢量磁位的矩形线圈磁场计算方法,通过此方法对系统目标面漏磁进行分析,为后续的磁泄漏优化提供了理论依据;其次,介绍了一种漏磁优化的方法,运用该方法得到满足要求的各线圈参数,为实现高效的无线电能传输提供了关键支持;最后,根据得到的线圈参数,研制了一套带磁屏蔽结构的双车位电动汽车无线充电系统,通过仿真和实验,让提出的屏蔽结构和方法的有效性得到了充分证实。结果显示,当系统输出功率恒定在4 kW时,所提出的屏蔽结构不仅使目标区域最大泄漏磁场降低了25%,且传输效率高达95%。 展开更多
关键词 电动汽车 无线电能传输 电磁屏蔽 传输效率
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基于磁控制的非谐WPT系统抗偏移策略
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作者 程江洲 吕奥博 +1 位作者 李振华 李黄强 《电力电子技术》 2024年第5期35-39,共5页
针对无线电能传输(WPT)系统耦合线圈偏移导致输出电压增益下降的问题,提出一种基于初级可变电感补偿的WPT系统抗偏移方法。首先,建立T型CLC-S补偿网络拓扑模型,对比分析系统谐振与非谐振工况下互感与电压增益的关系。然后,介绍可变电感... 针对无线电能传输(WPT)系统耦合线圈偏移导致输出电压增益下降的问题,提出一种基于初级可变电感补偿的WPT系统抗偏移方法。首先,建立T型CLC-S补偿网络拓扑模型,对比分析系统谐振与非谐振工况下互感与电压增益的关系。然后,介绍可变电感的技术原理,并结合系统互感变化下的电压增益曲线,得到基于初级可变电感的稳压策略。最后,搭建了仿真模型与实验平台,验证了策略的有效性。仿真和实验结果表明,采用所提稳压策略能够有效提升系统在偏移情况下的鲁棒性,相较于实验组,扩宽了互感可变化范围59.35%,恒压输出区间范围内效率稳定保持在81.6%以上。 展开更多
关键词 无线电能传输 抗偏移 可变电感
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海水对UUV WPT系统的影响及耦合机构的补偿研究
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作者 高国章 于梓航 李佳奇 《船舶工程》 CSCD 北大核心 2024年第2期18-23,33,共7页
针对水下无人航行器(UUV)无线电能传输(WPT)系统的效率和稳定性问题,建立了水下WPT等效电路,并对其工作原理进行了数学推导和分析。以此为基础研究了海水环境对WPT电路性能的影响机理,推导出了WPT系统在海水中的传输功率及效率模型。由... 针对水下无人航行器(UUV)无线电能传输(WPT)系统的效率和稳定性问题,建立了水下WPT等效电路,并对其工作原理进行了数学推导和分析。以此为基础研究了海水环境对WPT电路性能的影响机理,推导出了WPT系统在海水中的传输功率及效率模型。由于在海浪和海流等水下外界干扰下电能传输机构的收/发端均会产生偏移,从而影响系统电能传输的稳定性和效率。为减小影响,分析了4种典型拓扑补偿电路结构,并给出了最优补偿电路选取原则。最后,在MATLAB平台进行验证,结果验证了数学推导的正确性以及补偿电路设计的有效性。研究结果可为类似水下无线供电系统的设计提供借鉴。 展开更多
关键词 水下无人航行器 无线电能传输 电路拓扑设计 海浪海流干扰
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基于WPT的去蜂窝mMIMO系统中无人机轨迹与充放电联合优化方法
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作者 王琴 宁洛函 +3 位作者 张钰瑄 刘颖 蔡艳 赵海涛 《物联网学报》 2024年第3期26-35,共10页
在去蜂窝大规模多输入多输出(CF-mMIMO, cell-free massive multiple-input multiple-output)系统中,无人机(UAV, unmanned aerial vehicle)作为移动接入点(AP, access point),在通信和任务执行中发挥的作用越来越重要。为了提高UAV执... 在去蜂窝大规模多输入多输出(CF-mMIMO, cell-free massive multiple-input multiple-output)系统中,无人机(UAV, unmanned aerial vehicle)作为移动接入点(AP, access point),在通信和任务执行中发挥的作用越来越重要。为了提高UAV执行复杂任务时的续航能力,研究了基于无线电力传输(WPT, wireless power transmission)的CF-mMIMO的UAV能量收发和轨迹设计方法。以中断用户的通信公平性为优化目标,考虑在UAV任务执行过程中由接入点提供能量补给的能耗约束,对UAV的飞行轨迹、充放电时隙以及波束成形进行联合优化。针对该复杂优化问题,采用基于角度搜索的通信辅助深度Q网络(DQN, deep Q-network)算法,通过限制搜索空间的角度范围,对问题进行有限空间搜索。仿真结果表明,在UAV兼顾续航以及通信情况下,该算法能显著提高UAV的使用率并增强中断用户设备(UE, user equipment)的通信公平性,实现区域动态覆盖。 展开更多
关键词 去蜂窝大规模MIMO系统 动态覆盖 无人机 轨迹设计 无线电力传输
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基于SAR阻抗匹配的WPT最大效率跟踪控制方法
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作者 郑宏 尤涛 +1 位作者 许奕然 杨亮 《电子器件》 CAS 2024年第1期188-193,共6页
无线电能传输(WPT)技术因其安全、便捷、非接触等优点而备受关注。最大效率传输是WPT系统中一个重要课题。传统的最大效率跟踪方法通常设定系统在固定耦合条件进行负载阻抗匹配,然而,耦合系数会在初级和次级线圈相对位置变化时不可避免... 无线电能传输(WPT)技术因其安全、便捷、非接触等优点而备受关注。最大效率传输是WPT系统中一个重要课题。传统的最大效率跟踪方法通常设定系统在固定耦合条件进行负载阻抗匹配,然而,耦合系数会在初级和次级线圈相对位置变化时不可避免地发生变化。提出基于耦合系数辨识与半有源整流(SAR)阻抗匹配的最大效率跟踪控制方法,该方法利用SAR结合耦合系数识别进行阻抗匹配,开关控制电容(SCC)补偿其阻抗虚部,避免了整流电路中非线性因素的影响。同时系统响应较快且控制方法便于实现。仿真和实验结果表明,耦合系数和等效负载变化时,都可以准确估计耦合系数并跟踪至最大效率点和输出恒压。 展开更多
关键词 无线电能传输(wpt) 最大效率跟踪 SAR阻抗匹配 耦合系数辨识
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