期刊,电子学报（英文） 2022年卷6期_国家学术搜索

期刊信息/Journal information

电子学报（英文）

出版周期：双月刊

国际刊号：1022-4653

电子学报（英文）/Journal Chinese Journal of ElectronicsCSCDCSTPCDEISCI

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Real-World Wireless Network Modeling and Optimization:From Model/Data-Driven Perspective

LI YangZHANG ShutaoREN XiaohuiZHU Jianhang...

991-1012页

查看更多>>摘要：With the rapid development of the fifth-generation wireless communication systems,a profound revolution in terms of transmission capacity,energy effi-ciency,reliability,latency,and connectivity is highly ex-pected to support a new batch of industries and applica-tions.To achieve this goal,wireless networks are becom-ing extremely dynamic,heterogeneous,and complex.The modeling and optimization for the performance of real-world wireless networks are extremely challenging due to the difficulty to predict the network performance as a function of network parameters,and the prohibitively huge number of parameters to optimize.The convention-al network modeling and optimization approaches rely on drive test,trial-and-error,and engineering experience,which are labor intensive,error-prone,and far from op-timal.On the other hand,while the research community has spent significant efforts in understanding the funda-mental limits of radio channels and developing physical layer techniques to operate close to it,very little is known about the performance limits of wireless networks,where millions of radio channels interact with one another in complex manners.This paper reviews the very recent mathematical and learning based techniques for modeling and optimizing the performance of real-world wireless net-works in five aspects,including channel modeling,user demand and traffic modeling,throughput modeling and prediction,network parameter optimization,and IRS em-powered performance optimization,and also presents the corresponding notable performance gains.

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Network Element Placement for Space-Air-Ground Integrated Network:A Tutorial

GENG YuhuiCAO XianbinCUI HuanxiXIAO Zhenyu...

1013-1024页

查看更多>>摘要：With the demand for Internet connectiv-ity in remote areas,the space-air-ground integrated net-work(SAGIN)was proposed to achieve ubiquitous cover-age and enhance service capabilities of extant terrestrial networks.The paradigm of virtual network element place-ment(NEP)is applied into SAGIN.It can save energy and operating costs by placing specific network elements(NEs)as software instances.In addition,it helps to provide services in end-to-end networks with its ability to allocate and manage resources flexibly.However,NEP faces some challenges in SAGIN.The network topologies can be dynamic,and links such as the satellite-to-ground and air-to-ground ones are prone to fail.These will make NEP management more complicated.Moreover,the stat-ic NEP schemes are hard to accommodate the time-vary-ing traffic.In this context,this work explains the NEP problem in SAGIN from three aspects,i.e.,the SAGIN radio access network(RAN),the SAGIN core network(CN),and the SAGIN barrier network(BN).First,the physical and networking architectures of SAGIN are in-troduced.Then the status of the network element place-ment and corresponding challenges are described from these two aspects.Finally,this paper discusses future re-search directions and key technical challenges.

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Internet of Brain,Thought,Thinking,and Creation

ZHANG ZhiminYIN RuiNING Huansheng

1025-1042页

查看更多>>摘要：Thinking space came into being with the emergence of human civilization.With the emergence and development of cyberspace,the interaction between those two spaces began to take place.In the collision of think-ing and technology,new changes have taken place in both thinking space and cyberspace.To this end,this paper di-vides the current integration and development of think-ing space and cyberspace into three stages,namely Inter-net of brain(IoB),Internet of thought(IoTh),and Inter-net of thinking(IoTk).At each stage,the contents and technologies to achieve convergence and connection of spaces are discussed.Besides,the Internet of creation(IoC)is proposed to represent the future development of thinking space and cyberspace.Finally,a series of open is-sues are raised,and they will become thorny factors in the development of the IoC stage.

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Hybrid Beamforming for Terahertz Wireless Communications with Beam Squint:A Survey

WU YezengXIAO LixiaLIU GuanghuaJIANG Tao...

1043-1052页

查看更多>>摘要：Benefiting from the ultra-wide band-width,terahertz(THz)communication is considered one of the core technologies of the 6G mobile communication.However,high path loss is a severe issue for THz band,which needs to be solved by the ultra-massive multiple-in-put multiple-output(MIMO)technology.For the sake of reducing the hardware cost and power comsumption,the hybrid beamforming technology is required,which has been adopted in the 5G communication.In the hybrid beamforming for the THz wideband system,the enorm-ous antenna and ultra-wide bandwidth cause the spatial-and frequency-wideband effect,resulting in acute beam squint.Eliminating beam squint is the key to the engin-eering realization of ultra massive MIMO for the THz band.To circumvent this issue,this paper presents a comprehensive overview of the hybrid beamforming tech-nology including the channel model,the traditional phase shifter based and the true time delay based architectures,the 3D hybrid beamforming for the uniform planar array.Finally,multiple significant open issues and potential challenges are pointed out and elaborated.

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Time-Resolved Spectroscopy for the Study of Perovskite

SHEN TangyaoZHAN YiqiangSHI Lei

1053-1071页

查看更多>>摘要：Carrier behavior in halide perovskite is a critical factor impacting on the properties of material,and finally determines the performance of perovskite photo-voltaic and luminescent devices.It is necessary to clarify the mechanism of carrier relaxation and migration at ex-tremely microscopic time scale.Time-resolved spectro-scopy provides a powerful means for the detection of ul-trafast processes,which has been an indispensable tech-nique in research on perovskites.In this review,we will elaborate the basic principle and system implementation of time-resolved spectroscopy,and introduce the applica-tions for carrier dynamics in perovskite.

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A Region-Based Analysis for the Feature Concatenation in Deep Forests

LYU Shen-HuanCHEN Yi-HeZHOU Zhi-Hua

1072-1080页

查看更多>>摘要：Deep forest is a tree-based deep model made up of non-differentiable modules that are trained without backpropagation.Despite the fact that deep forests have achieved considerable success in a variety of tasks,feature concatenation,as the ingredient for forest representation learning,still lacks theoretical understand-ing.In this paper,we aim to understand the influence of feature concatenation on predictive performance.To en-able such theoretical studies,we present the first math-ematical formula of feature concatenation based on the two-stage structure,which regards the splits along new features and raw features as a region selector and a re-gion classifier respectively.Furthermore,we prove a re-gion-based generalization bound for feature concatenation,which reveals the trade-off between Rademacher com-plexities of the two-stage structure and the fraction of in-stances that are correctly classified in the selected region.As a consequence,we show that compared with the pre-diction-based feature concatenation(PFC),the advant-age of interaction-based feature concatenation(IFC)is that it obtains more abundant regions through distrib-uted representation and alleviates the overfitting risk in local regions.Experiments confirm the correctness of our theoretical results.

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Unsupervised Cross-Media Hashing Learning via Knowledge Graph

YE ZhaodaHE XiangtengPENG Yuxin

1081-1091页

查看更多>>摘要：With the rapid growth of multimedia data,cross-media hashing has become an important tech-nology for fast cross-media retrieval.Because the manual annotations are difficult to obtain in real-world applica-tion,unsupervised cross-media hashing is studied to ad-dress the hashing learning without manual annotations.Existing unsupervised cross-media hashing methods gen-erally focus on calculating the similarities through the fea-tures of multimedia data,while the learned hashing code cannot reflect the semantic relationship among the multi-media data,which hinders the accuracy in the cross-me-dia retrieval.When humans try to understand multime-dia data,the knowledge of concept relations in our brain plays an important role in obtaining high-level semantic.Inspired by this,we propose a knowledge guided unsuper-vised cross-media hashing(KGUCH)approach,which ap-plies the knowledge graph to construct high-level semant-ic correlations for unsupervised cross-media hash learning.Our contributions in this paper can be summarized as fol-lows:1)The knowledge graph is introduced as auxiliary knowledge to construct the semantic graph for the con-cepts in each image and text instance,which can bridge the multimedia data with high-level semantic correlations to improve the accuracy of learned hash codes for cross-media retrieval.2)The proposed KGUCH approach con-structs correlation of the multimedia data from both the semantic and the feature aspects,which can exploit com-plementary information to promote the unsupervised cross-media hash learning.The experiments are conduc-ted on three widely-used datasets,which verify the effect-iveness of our proposed KGUCH approach.

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A CMOS 4-Element Ku-Band Phased-Array Transceiver

ZHANG XiaoningYU YimingZHAO ChenxiLIU Huihua...

1092-1105页

查看更多>>摘要：This paper presents a Ku-Band fully dif-ferential 4-element phased-array transceiver using a standard 180-nm CMOS process.Each transceiver is in-tegrated with a 5-bit phase shifter and 4-bit attenuator for high-resolution radiation manipulation.The front-end system adopts time-division mode,and hence two low-loss T/R switches are included in each channel.At room tem-perature,the measured root-mean-square(RMS)phase error is less than 5.5°.Furthermore,the temperature in-fluence on passive switched phase shifters is analyzed.Meanwhile,an extra phase-shifting cell is developed to calibrate phase error varying with the operating temper-atures.With the calibration,the RMS phase error is re-duced by 7° at-45℃,and 5.4° at 85℃.The RMS amp-litude error is less than 0.92 dB at 15-18 GHz.In the RX mode,the tested gain is 9.6±1.1 dB at 16.5 GHz with a noise figure of 10.9 dB,and the input P1dB is-15 dBm,while the single-channel's gain and output P1dB in the TX mode are 11.3±0.4 dB and 9.4 dBm at 16.1 GHz,respect-ively.The whole chip occupies an area of 5x4.2 mm2 and the measured isolation between each two adjacent chan-nels is lower than-23.1 dB.

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Geometrically Shaped 32QAM and Modified Binary Switching Coding Method in Underwater Visible Light Communication

SHI JianyangCAI JifanQIN GuojinJIN Ruizhe...

1106-1111页

查看更多>>摘要：Visible light communication(VLC)has emerged as a promising communication method in 6G,particularly in the domain of underwater communication.However,because of its intimate coupling to the light-emitting diodes(LED),the transmission rate is limited by the modulation bandwidth and the nonlinearity of the LED.With current device development,LED bandwidth is substantially lower than that of other optical commu-nication devices,necessitating improved spectral effi-ciency and nonlinearity robustness to achieve high-speed transmission.In this paper,we propose a hexagonal con-stellation-based geometrically shaped(GS)32QAM with carrierless amplitude and phase(CAP)modulation for the underwater VLC system.A comprehensive performance comparison of four GS modulation methods,including our proposed hexagonal-32QAM,normal 32QAM,square-32QAM and 32APSK is investigated in both theory and experiment.The hexagonal-32QAM with a modified bin-ary switching coding(BSC)can obtain a Q factor gain of 0.44 dB,and a data rate improvement of 25 Mb/s com-pared with Gary coding based normal 32QAM.The ex-perimentally results illustrate the feasibility of geometric shaping 32QAM in underwater visible light communica-tion.

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Temporal Modal Analysis of Small Radiators

WU Qi

1112-1120页

查看更多>>摘要：Resonance is a common physical phe-nomenon in real world,and the modal analysis is a useful tool.Within the regime of electromagnetics,characterist-ic mode theory is established in frequency domain(FD),and it is doubtful that whether we can find similar modes in time domain(TD).In this paper,resonating modes of a vibrating string are briefly reviewed.Special attentions are paid to the time-domain behaviors of the resonating modes,by following which a temporal modal analysis is proposed.Additionally,a narrow plate is selected as an example since it has a similar structure as the vibrating string.Temporal modal behaviors of the plate are presen-ted and discussed.To further demonstrate this concept,a rigorous analysis of a sphere is provided.A frequency-in-dependent condition is discussed and verified for small ob-jects,and it results in a band-limited constraint.In addi-tion,the temporal modal analysis with excitations is presented,and its potential applications are discussed with emphasis on the analyzing and optimizing transient behaviors of antennas.This work expands largely the field of characteristic mode and may find applications for scat-tering and antennas.

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