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Multi-Gateway Hybrid Space-Ground Precoding for Multi-Beam Satellite Communications

Multi-Gateway Hybrid Space-Ground Precoding for Multi-Beam S...

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International Conference on Communications, Signal Processing, and their Applications (ICCSPA)

作者： Huda Ali Yuan He Xuan Feng Kang Liu Min Chen Qing Su Rui Chen State Key Lab. of ISN Xidian University Xian China Institute of Telecommunication and Navigation Satellites China Academy of Space Technology Innovation Center for Satellite Communication System Beijing China

ISBN: (数字)9798350384819

ISBN: (纸本)9798350384826

Multi-beam satellite communication system has received significant attention due to its potential in greatly enhancing ground-space transmission rate. For maximizing spectral efficiency (SE), multi-gateway multi-beam satellite systems with multiple feeds per beam (MFPB) has been developed recently, in which each gateway serves a cluster of beams. Due to full frequency reuse between multiple beams, precoding is essential to mitigate inter-user interference. In this paper, a hybrid spaceground precoding architecture, which consists of sub-connected MFPB analog beamforming on the satellite and baseband digital precoding on the ground, is proposed for balancing the SE and satellite complexity. The corresponding recursive hybrid spaceground precoding algorithm enables the architecture based on decomposing the sum rate maximization problem into sub-rate maximization problems for each user. Numerical simulations show that the proposed scheme achieves higher SE than the optimal on-ground precoding and traditional four-color reuse scheme.

关键词： Satellites Baseband Array signal processing Spectral efficiency Precoding Signal processing algorithms Logic gates Numerical simulation Complexity theory Satellite communications

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A DESIGN OF BOX-METER BINDING system FOR POWER METERING BOX 22

A DESIGN OF BOX-METER BINDING SYSTEM FOR POWER METERING BOX

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3rd International Conference on Control, Robotics and intelligent system, CCRIS 2022

作者： He, Xing Huang, Rui Yu, Minqi Zeng, Wenwei Zhang, Suihan State Grid Hunan Electric Power Company Limited Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha Hunan410000 China College of Electrical and Information Engineering Hunan University Changsha Hunan410000 China State Grid Hunan Electric Power Company Limited China and Hunan Prov. Key Lab. of Intelligent Electrical Measurement and Application Technology China

ISBN: (纸本)9781450396851

At present, most of the topological identification and binding methods of box tables in power metering boxes are supported by the later platform algorithm. When installing or replacing electricity meters is installed, it is easy to lead to the wrong identification of box-meter binding. In this paper, the MCU and the multi-channel RFID identification board to obtain the asset information in the meter lab.l, record the asset information data analysis and forward, and realize the accurate search, positioning, identification, recording, binding and other functions in the metering box. After the realization of the table and box relationship binding, the system establishes the relationship table internally, uploads the box and table relationship table to the energy controller through HPLC (High Performance Liquid Chromatography), and establishes the box and table ledger data of each metering box in the platform area. Through this method, the binding relationship between the individual meter and the corresponding position in the box is realized, which solves the problems of the meter management chaos and the box meter position relationship in the operation and maintenance process, which is of great significance to the humanized and efficient development of smart meters. © 2022 ACM.

关键词： Radio frequency identification (RFID)

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Load-Balanced and Full-Coverage Beam Layout for Multibeam Satellite systems

Load-Balanced and Full-Coverage Beam Layout for Multibeam Sa...

引用

International Conference on Communications, Signal Processing, and their Applications (ICCSPA)

作者： Yuan He Kaiqiang Qi Xuan Feng Rui Chen State Key Lab. of ISN Xidian University Xian China Institute of Telecommunication and Navigation Satellites China Academy of Space Technology Innovation Center for Satellite Communication System Beijing China

ISBN: (数字)9798350384819

ISBN: (纸本)9798350384826

In multibeam satellite systems, traditional beam layout scheme mainly adopted uniform and regularly spaced circular beams that span the service area, which results in some beams wasting resources and others failing to meet the service requirement. Recently, a beam layout design has been proposed from the perspective of load balancing among the serving cells divided by Voronoi. However, this beam layout scheme can not cover all service areas due to Voronoi does not coincide with the actual circular and full-coverage beam coverage area. To address this problem, we propose an improved load-balanced and full-coverage beam layout scheme, which initiates by dividing users into different clusters based on the user distances and the cluster traffic weighted K-Means++ algorithm, then iteratively adjusts each cluster center based on the distance between each cluster center and the traffic differences of clusters, in the end employs the minimum circle covering algorithm to generate corresponding beams. The iterative refinement process aims to ensure that every beam exhibits similar traffic load. Numerical simulations validate that the proposed scheme achieves both load balancing among beams and full coverage of all users.

关键词： Satellites Layout Signal processing algorithms Clustering algorithms Telecommunication traffic Signal processing Load management Numerical simulation Reliability Satellite communications

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Domain Knowledge Enhanced Deep Neural Network for Limited Data SAR Vehicle Target Recognition

Domain Knowledge Enhanced Deep Neural Network for Limited Da...

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2021 CIE International Conference on Radar, Radar 2021

作者： Zhang, Linbin Leng, Xiangguang Tang, Tao Ji, Kefeng Xiong, Boli Kuang, Gangyao National University of Defense Technology The State Key Lab. of Complex Electromagnetic Environ. Effects on Electronics and Information System Changsha China

ISBN: (纸本)9781665498142

Synthetic aperture radar (SAR) target recognition faces the challenges that there are limited lab.led data. Recent limited data SAR target recognition algorithms overlook the domain knowledge of the target. Domain knowledge enhanced deep neural network (DK-ConvNet) is proposed in this study, which considers the azimuth angle, the length-width-ratio and the targets' area of SAR vehicles, to overcome the over-fitting problems of limited data. The information of vehicle domain knowledge is merged to the probability output of A-ConvNet. To extract the domain knowledge accurately, the segmentation results in the SARBake database are also used. All experiments are conducted under the public moving and stationary target acquisition and recognition (MSTAR) database. Our proposed DK-ConvNet has achieved 72.2% and 93.1% under 10-way 10-shot and 10-way 30-shot in standard operation condition (SOC), whose lab.led samples are randomly selected from the training set and DK-ConvNet demonstrated advantages in accuracy compared with other limited data classification methods as well. © 2021 IEEE.

关键词： Convolutional Neural Network Image classification Limited Data SAR target recognition

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Feature Refinement Deformable Network for Aircraft Detection in SAR images

Feature Refinement Deformable Network for Aircraft Detection...

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2021 CIE International Conference on Radar, Radar 2021

作者： Zhao, Yan Zhao, Lingjun Kuang, Gangyao State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781665498142

Aircraft with advantages of mobility and carrying ability plays an indispensable role in modern transportation areas. However, detecting aircraft in SAR images still meets serious challenges due to discrete spatial distributions of back-scattering points, diversified gestures of aircraft as well as complex surroundings. In this paper, a Feature Refinement Deformable Network (FRDN) is proposed by carefully designing a Feature Fusion Attention Module (FFAM) and a Deformable Latent Convolutional Module (DLCM).Moreover, FFAM is designed to fuse structural and abstract features and highlight significant information of aircraft effectively. DLCM focus on capturing significant features of discrete-distributed back-scattering points of aircraft. The contributions of FFAM and DLCM are carefully exploited and the detection performance of our method is compared with other specific and general CNN-based methods on a self-built SAR aircraft detection *** results illustrates the effectiveness of our method for aircraft detection in SAR images. © 2021 IEEE.

关键词： aircraft detection deformable latent connection module (DLCM) feature fusion attention module (FFAM) Feature refinement deformable network (FRDN) SAR images synthetic aperture radar

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Energy Harvesting Analysis and Sensing Application of Cantilever Structure Based on Aeolian Vibration and Piezoelectric Effect

Energy Harvesting Analysis and Sensing Application of Cantil...

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2023 IEEE International Conference on Advanced Power system Automation and Protection, APAP 2023

作者： Gao, Yisong Fu, Fangda Chen, Lincong Chen, Qinzhu Wang, Zhiming Tan, Zejie Ni, Yang Hainan Power Grid Transmission & Maintenance Branch Corp Production Technology Department China Electric Power Research Institute Hainan Power Grid Co Key Laboratory of Physical and Chemical Analysis for Electric Power of Hainan Province China Digital Grid Research Institute China Southern Power Guangdong Provincial Key Laboratory of Digital Grid Technology China Chongqing University State Key Lab. of Power Transmission and Distribution Equipment and System Safety and New Technology Chongqing China

ISBN: (纸本)9798350306668

Based on aeolian vibration and piezoelectric effect, a cantilever energy harvester is proposed to supply energy to a micro-meteorological online monitoring sensing system for transmission lines. According to the Hamiltonian variational principle and Gauss's law, the distributed parameter coupling model of the piezoelectric cantilever energy harvesting module in the system is established, and the theoretical analytical expression of the output response of the energy harvesting module is derived by the Galerkin decomposition method and the force electrolytic coupling method. The influences of external excitation frequency and external load resistance on the output response of the system energy harvesting module are discussed. The results indicate that the highest output power is obtained when the external excitation frequency is equal to the natural frequency of the structure. Besides, the optimal external load resistance is always exciting with maximum electric power and the smallest vibration displacement. Finally, through indoor tests, the practicability of the self-powered micro-meteorological online monitoring system proposed in this paper is demonstrated. The research results in this paper can provide theoretical and experimental reference for the study of self-energy harvesting of transmission line online monitoring systems, and help for the safe operation and risk warning of transmission lines. © 2023 IEEE.

关键词： Piezoelectricity

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Orthogonality derivation of polarization state based on Poincaré sphere 4

Orthogonality derivation of polarization state based on Poin...

引用

4th International Conference on Physics, Mathematics and Statistics, ICPMS 2021

作者： Wang, Zhanling Huang, Jiankai Pang, Chen State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Technology National University of Defense Technology Changsha China

To make full use of the polarization information of electromagnetic waves for the polarimetric sensor array, we derive the orthogonality expression of the polarization state based on the Poincaré sphere (PS) representation. The ellipticity angle and the orientation angle of the ellipse are used to describe the polarization ellipse and the point on the surface of the Poincaré sphere. The derivation shows that two points that characterize a pair of orthogonal polarization states are distributed in the opposite positions. Compared with the conventional linear and circular polarization state, the flexible elliptical polarization state would result in the maximum separation of co-polarization and cross-polarization components, thereby enhancing the accuracy of polarization information measurement. The simulation result displays the correctness of the theoretical derivation, which could provide a basis for the further polarization state configuration. © Published under licence by IOP Publishing Ltd.

关键词： Electromagnetic waves

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STFDs and FBSS Techniques for Direction of Arrival Estimation of Coherent LFM 5

STFDs and FBSS Techniques for Direction of Arrival Estimatio...

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5th International Conference on Communication and Information systems, ICCIS 2021

作者： Dengxin, Li Kaibo, Cui Hongyang, Jia Naichang, Yuan National University of Defense Technology State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System Hunan Changsha410073 China

ISBN: (纸本)9781665422161

A novel direction of arrival (DOA) estimation algorithm for coherent linear frequency modulated (LFM) sources called time-frequency forward/backward spatial smoothing (TF-FBSS) algorithm is proposed. This new algorithm estimates DOAs using the time-frequency (TF) analysis tools and the forward/backward spatial smoothing (FBSS) techniques. The proposed algorithm constructs the spatial time-frequency distributions (STFDs) of the array by selecting a plurality of TF points. Then, the time-varying manifold matrix of the LFM signals in the time domain is transformed to a time-invariant manifold matrix in the TF domain. Finally, we can use the FBSS techniques to distinguish the coherent LFM sources. The simulation results show the good performance of the proposed algorithm. © 2021 IEEE.

关键词： Direction of arrival

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Adaptive Polarization Canceler for ISAR Wideband Noise Blanketing Jamming 2021

Adaptive Polarization Canceler for ISAR Wideband Noise Blank...

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2021 International Conference on Frontiers of Electronics, Information and Computation Technologies, ICFEICT 2021

作者： Yang, Hui Dai, Huanyao Wang, Daoyou National University of Defense Technology Changsha China State Key Lab. of Complex Electromagnetic Envirmental Effects on Electronics and Information System Luoyang China

ISBN: (纸本)9781450390149

Aiming at the active wideband blanketing jamming faced by ISAR and considering that the channel is not ideal, we have established a receiving signal model for polarity diversity ISAR. Based on the criterion of the minimum average power of the output jamming subject to the radial range dimension, this paper has proposed a wideband adaptive polarization canceler (WAPC) and analyzed its performance of blanketing jamming;through simulation, the two evaluation parameters (range image entropy and image entropy) are adopted to have verified the effectiveness of the method based on imaging simulation experiments. © 2021 ACM.

关键词： Jamming

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Interrupted Sampling Repeater Signal Based on Phase Modulation 13

Interrupted Sampling Repeater Signal Based on Phase Modulati...

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13th International Conference on Microwave and Millimeter Wave technology, ICMMT 2021

作者： Jianwei, Sun Chao, Wang Qingzhan, Shi Wenbo, Ren Zekun, Yao Naichang, Yuan National University Of Defense Technology State Key Lab. Of Complex Electromagnetic Environ. Effects On Electronics And Information System Changsha410073 China

ISBN: (纸本)9781665434379

Interrupted-sampling repeater and pseudo-random sequence phase modulation have proven to be effective patterns. Based on the existing research, the effects of interrupted-sampling repeater signal and phase-modulation signal are analyzed and simulated, and the effect of Interrupted-sampling periodic repeater signal based on phase modulation is discussed. © 2021 IEEE.

关键词： Phase modulation

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