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2024 IEEE International Symposium on Phased Array Systems and technology, ARRAY 2024

作者： Strong, Matthew Cohen, Morris Low Frequency Radio Group Georgia Institute of Technology AtlantaGA United States School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA United States

ISBN: (纸本)9798350392142

We present results from an array of low-frequency (500 Hz - 500 kHz) radio receivers, passively recording VLF (3-30 kHz) emissions from natural lightning and navy VLF transmitters. A series of signal processing, machine learning, and tomographic techniques amalgamates this dataset to reconstruct the 3D D-region (60-90 km) ionospheric electron density profiles over the Gulf of Mexico and Southeastern USA. We present profiles over a selected 13-day period in August 2017 during which time there was a solar eclipse and multiple major solar flares. The VLF electron density profiles are also used to infer HF absorption as a function of location and time, a technique described in this paper. We use this to validate our D-region inferences by comparing against a ground-based ionosonde in-strument. © 2024 IEEE.

关键词： D region

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Ultra Dense Satellite-Enabled 6G Networks:Resource Optimization and Interference Management

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China Communications 2023年第10期20卷 262-275页

作者： Xiangnan Liu Haijun Zhang Min Sheng Wei Li Saba Al-Rubaye Keping Long School of Computer&Communication Engineering University of Science and Technology BeijingBeijing 100083China Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services University of Science and Technology BeijingBeijing 100083China School of Telecommunications Engineering Xidian UniversityXi’an 710071China State Radio Monitoring Center of China Beijing 100037China School of Aerospace Transport and Manufacturing Cranfield UniversityMK430ALUK

With the evolution of the sixth generation(6G)mobile communication technology,ample attention has gone to the integrated terrestrial-satellite *** paper notes that four typical application scenarios of integrated terrestrial-satellite networks are integrated into ultra dense satellite-enabled 6G networks *** the subchannel and power allocation schemes for the downlink of the ultra dense satellite-enabled 6G heterogeneous networks are *** mobile edge computing(SMEC)with edge caching in three-layer heterogeneous networks serves to reduce the link traffic of ***,a scheme for interference management is presented,involving quality-of-service(QoS)and co-tier/cross-tier interference *** simulation results show that the proposed schemes can significantly increase the total capacity of ultra dense satellite-enabled 6G heterogeneous networks.

关键词： satellite-enabled 6G networks network architecture resource optimization interference management

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Belief Propagation List Decoding for Polar Codes:Performance Analysis and Software Implementation on GPU

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China Communications 2023年第9期20卷 115-126页

作者： Zhanxian Liu Wei Li Lei Sun Wei Li Jianquan Wang Haijun Zhang School of Computer&Communication Engineering University of Science and Technology BeijingBeijing 100083China Satellite Frequency and Orbit Resource Agency State Radio Monitoring CenterBeijing 100041China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing 100083China Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services Institute of Artificial IntelligenceUniversity of Science and Technology BeijingBeijing 100083China

Belief propagation(BP)decoding outputs soft information and can be naturally used in iterative *** list(BPL)decoding provides comparable error-correction performance to the successive cancellation list(SCL)*** this paper,we firstly introduce an enhanced code construction scheme for BPL decoding to improve its errorcorrection ***,a GPU-based BPL decoder with adoption of the new code construction is ***,the proposed BPL decoder is tested on NVIDIA RTX3070 and *** results show that the presented BPL decoder with early termination criterion achieves above 1 Gbps throughput on RTX3070 for the code(1024,512)with 32 lists under good channel conditions.

关键词： polar code belief propagation SIMT list decoding GPU

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Analysis on D2D Heterogeneous Networks with State-Dependent Priority Traffic

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computers, Materials & Continua 2023年第2期74卷 2981-2998页

作者： Guangjun Liang Jianfang Xin Linging Xia Xueli Ni Yi Cao Department of Computer Information and Cyber Security Jiangsu Police InstituteNanjingChina National and Local Joint Engineering Laboratory of Radio Frequency Integration and Microassembly Technology Nanjing University of Posts and TelecommunicationsNanjingChina School of Intelligent Engineering Nanjing Institute of Railway TechnologyNanjingChina Jiangsu Province Electronic Data Forensics and Analysis Engineering Research Center NanjingChina Department of Electrical and Computer Engineering University of WindsorWindsorONN9B 3P4Canada

In this work,we consider the performance analysis of state dependent priority traffic and scheduling in device to device(D2D)heterogeneous *** are two priority transmission types of data in wireless communication,such as video or telephone,which always meet the requirements of high priority(HP)data transmission *** there is a large amount of low priority(LP)data,there will be a large amount of LP data that cannot be *** situation will cause excessive delay of LP data and packet dropping *** order to solve this problem,the data transmission process of high priority queue and low priority queue is *** the priority jump strategy to the priority queuing model,the queuing process with two priority data is modeled as a two-dimensionalMarkov chain.A state dependent priority jump queuing strategy is proposed,which can improve the discarding performance of low priority *** quasi birth and death process method(QBD)and fixed point iterationmethod are used to solve the causality,and the steady-state probability distribution is further ***,performance parameters such as average queue length,average throughput,average delay and packet dropping probability for both high and low priority data can be *** simulation results verify the correctness of the theoretical ***,the proposed priority jump queuing strategy can significantly improve the drop performance of low-priority data.

关键词： Stochastic geometry queuing theory D2D heterogeneous networks quasi-birth and death process

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Long-term radiofrequency electromagnetic fields exposure attenuates cognitive dysfunction in 5×FAD mice by regulating microglial function

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Neural Regeneration Research 2023年第11期18卷 2497-2503页

作者： Yeonghoon Son Hye-Jin Park Ye Ji Jeong Hyung-Do Choi Nam Kim Hae-June Lee Division of Radiation Biomedical Research Korea Institute of Radiological&Medical SciencesSeoulKorea Department of EMF Research Team Radio and Broadcasting Technology LaboratoryElectronics and Telecommunications Research InstituteDaejonKorea School of Electrical and Computer Engineering Chungbuk National UniversityCheongjuKorea

We have previously found that long-term effects of exposure to radiofrequency electromagnetic fields in 5xFAD mice with severe late-stage Alzheimer’s disease reduced both amyloid-βdeposition and glial activation,including *** examine whether this therapeutic effect is due to the regulation of activated microglia,we analyzed mic roglial gene expression profiles and the existence of microglia in the brain in this study.5xFAD mice at the age of 1.5 months were assigned to sham-and radiofrequency electromagnetic fields-exposed groups and then animals were exposed to 1950 MHz radiofrequency electromagnetic fields at a specific absorption rate of 5 W/kg for 2 hours/day and 5 days/week for 6 *** conducted behavioral tests including the object recognition and Y-maze tests and molecular and histopathological analysis of amyloid precursor protein/a myloid-beta metabolism in brain *** confirmed that radiofrequency electromagnetic field exposure for 6 months ameliorated cognitive impairment and amyloid-β*** expression levels of Iba1(pan-microglial marker)and colony-stimulating factor 1 receptor(CSF1R;regulates microglial prolife ration)in the hippocampus in 5xFAD mice treated with radiofrequency electromagnetic fields were significantly reduced compared with those of the sham-exposed ***,we analyzed the expression levels of genes related to mic rogliosis and microglial function in the radiofrequency electromagnetic fields-exposed group compared to those of a CSF1R inhibitor(PLX3397)-treated *** radiofrequency electromagnetic fields and PLX3397 suppressed the levels of genes related to microgliosis(Csf1r,CD68,and Ccl6)and pro-inflammatory cytokine interleukin-1β.N otably,the expression levels of genes related to mic roglial function,including Trem2,Fcgr1α,Ctss,and Spi1,were decreased after long-term radiofrequency electromagnetic field exposure,which was also observed in response to microglial suppression by *** res

关键词： 5×FAD Alzheimer’s disease CSF1R long term exposure microglial function neuroinflammation radiofrequency electromagnetic fields therapeutic effect

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Analysis of the Efficiency of Radar Target Classification by Heinen Polarization Parameters in the Monostatic Configuration

Analysis of the Efficiency of Radar Target Classification by...

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2021 International Conference engineering and Telecommunication, En and T 2021

作者： Kopylov, Artyom A. Zimin, Igor V. Phystech School of Radio Engineering and Computer Technology Dolgoprudny Russia

ISBN: (纸本)9781728183909

A mathematical model of the radar target classification based on Heinen polarization parameters was developed. Simulations of the functioning process was carried out to analyze the effectiveness of the developed model. Based on these simulation results, an analysis of the effectiveness of this group of polarization parameters for the radar target classification problem was carried out. The article presents some results of the simulation. © 2021 IEEE.

关键词： Polarization

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Distributed Aperture Coherent Synthesis Method based on Two-stage Compensation 2

Distributed Aperture Coherent Synthesis Method based on Two-...

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2nd IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2024

作者： Liu, Zhongwei Zhou, Dongming Xiang, Rongrong Chen, Jie Wu, Tianhang Ding, Tianyu Liu, Xiaochuan Gao, Hongwei Beihang University School of Electronic and Information Engineering Beijing China School of Information and Electronics Beijing Institute of Technology Radar Research Lab Beijing China Beijing Institute of Computer Technology and Application Department of Data Technology and Application Beijing China Beijing Institute of Radio Measurement Radar R&d Center Beijing China

ISBN: (纸本)9798331515669

To solve the problem that it is difficult to accurately estimate the coherent parameters of distributed aperture radar under the condition of low signal-to-noise ratio, a distributed coherent synthesis method based on two-stage compensation is proposed in this paper. This method utilizes prior information such as system layout, beam pointing, and inertial navigation station location to perform coarse alignment of echoes at the first stage in time, and then uses cross-correlation method to estimate coherent parameters of delay and phase within a small range, and perform precise compensation of time and phase at the second stage, so as to realize the coherent synthesis of multiple radar echoes. Experimental results show that the proposed method can effectively realize distributed coherent synthesis processing under low signal-to-noise ratio. © 2024 IEEE.

关键词： Signal to noise ratio

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Millimeter-wave Wide-angle Scanning Phased Array Based on Heterogeneous Antenna Elements 15

Millimeter-wave Wide-angle Scanning Phased Array Based on He...

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15th International Conference on Microwave and Millimeter Wave technology, ICMMT 2023

作者： Wang, Zhongying Fan, Jiaojing Yang, Wanchen Che, Wenquan Xue, Quan Shanghai Radio Equipment Research Institute Shanghai China Hohai University College of Computer and Information Nanjing China South China University of Technology School of Electronic and Information Engineering Guangzhou China

ISBN: (纸本)9798350338874

In this manuscript, a millimeter-wave wide-angle scanning phased array based on heterogeneous antenna elements is proposed. The array consists of two different types of magneto-electric (ME) dipole antennas with broadside and end-fire radiation direction respectively. In order to improve scanning performance, the two end-fire elements are arranged at the two sides of the 6 broadside elements, thus a 1×8 wide-angle scanning array is built. The proposed phased array using LTCC multi-layer integration technology so that it can be integrated on a single board. The distance between each element is 0.4λ0 at 24GHz so as to suppress the side slob level during the whole scanning process. Decoupling structure is added between adjacent broadside elements to realize high isolation. The simulation result indicate that 10-dB impedance band of the proposed array can cover the band of 24 to 26GHz (8%) with the isolation higher than 22dB between adjacent elements. Moreover, the array can achieve a large scanning range of -75°~75° at 24GHz within 3dB gain drop, meanwhile keep the active S parameter lower than -9.5dB during the whole scanning range. Those results indicate that the proposed array is a competitive candidate in future millimeter-wave communication. © 2023 IEEE.

关键词： Millimeter waves

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Lensless efficient snapshot hyperspectral imaging using dynamic phase modulation

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Photonics Research 2025年第2期13卷 511-526页

作者： CHONG ZHANG XIANGLEI LIU LIZHI WANG SHINING MA YUANJIN ZHENG YUE LIU HUA HUANG YONGTIAN WANG WEITAO SONG Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Zhengzhou Research Institute Beijing Institute of TechnologyZhengzhou 450000China State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Computer Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Artificial Intelligence Beijing Normal UniversityBeijing 100875China

Snapshot hyperspectral imaging based on a diffractive optical element(DOE)is increasingly featured in recent progress in deep *** remarkable advances in spatial and spectral resolutions,the limitations of current photolithography technology have prevented the fabricated DOE from being designed at ideal heights and with high diffraction efficiency,diminishing the effectiveness of coded imaging and reconstruction accuracy in some ***,we propose,to our knowledge,a new lensless efficient snapshot hyperspectral imaging(LESHI)system that utilizes a liquid-crystal-on-silicon spatial light modulator(LCoS-SLM)to replace the traditionally fabricated DOE,resulting in high modulation levels and reconstruction *** the single-lens imaging model,the system can leverage the switch ability of LCoS-SLM to implement distributed diffractive optics(DDO)imaging and enhance diffraction efficiency across the full visible *** the proposed method,we develop a proof-of-concept prototype with an image resolution of 1920×1080 pixels,an effective spatial resolution of 41.74μm,and a spectral resolution of 10 nm,while improving the average diffraction efficiency from 0.75 to0.91 over the visible wavelength range(400-700 nm).Additionally,LESHI allows the focal length to be adjusted from 50 mm to 100 mm without the need for additional optical components,providing a cost-effective and timesaving solution for real-time on-site *** is the first imaging modality,to the best of our knowledge,to use dynamic diffractive optics and snapshot hyperspectral imaging,offering a completely new approach to computational spectral imaging and deep optics.

关键词： photolithography technology fabricated doe Efficient coded imaging diffractive optical element doe Snapshot Lensless deep opticsdespite

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Modelling a one-dimensional cross-range ISAR profile of a radar object

Modelling a one-dimensional cross-range ISAR profile of a ra...

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2021 Radiation and Scattering of Electromagnetic Waves, RSEMW 2021

作者： Parinov, Evgenii G. Zimin, Igor V. Phystech School of Radio Engineering and Computer Technology Moscow Institute of Physics and Technology Moscow Russia

ISBN: (纸本)9781665425445

In this paper the modeling of a one-dimensional (1D) cross-range inverse synthetic aperture radar (ISAR) profile of a radar object is considered. The object moves in a circular orbit. It is assumed that the object has an elongated shape. Formulas for modeling 1D ISAR profile of the radar object are given. The case of discrete observation angles is considered. © 2021 IEEE.

关键词： Radar imaging

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