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2nd International Conference on Power Electronics and Energy, ICPEE 2023

作者： Mishra, Tuhinanshu Singh, Ravindra Kumar Motilal Nehru National Institute of Technology-Allahabad Prayagraj Dept. of Electrical Engineering Prayagraj India

ISBN: (纸本)9781665470582

Electric vehicles reduce the on-board emission of pollutants but fail in resource consumption since grid-charged batteries rely on fossil fuel consumption. Vehicles based on renewable sources further eliminate this issue delivering completely pollution-free traction. This paper evaluates an erickshaw power train fed by PV and DC battery hybrid through a dual input triple output converter topology and investigates the performance of such vehicle through simulation. A multiinput multi-output converter reduces component count and extra losses while improving space utilization and packaging. Hardware implementation is done to analyze the proposed topology. This converter will extensively improve power train efficiency while reducing losses. © 2023 IEEE.

关键词： DC-DC converter electric vehicle multi-input multi-output power electronic converter renewable energy solar energy

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Covert Authentication for Securing MIMO Communications

Covert Authentication for Securing MIMO Communications

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作者： Jeong, Joon-Young Iowa State University

学位级别：M.S., Master of Science/Master of Surgery

This thesis aims to propose a covert authentication scheme that remains obfuscated to eavesdropping attacks by hiding the existence of the authentication tag. The attackers’ endeavor to impersonate a legitimate transmitter can be countered by generating the invisible tag. The essential concept we suggest is to superimpose the low-power tag onto the message such that we can effectively avoid the attention of malicious users. We derive the total detection error probability and demonstrate that it can converge to 1, implying that the tag is not detectable by the malicious users, as the number of transmit antennas increases. Also, the covert tag and authenticated message throughput are obtained and analyzed to see the influence of the number of antennas.

关键词： Authenticated message throughput Covert authentication Covert tag throughput MIMO communication multi-input multi-output

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SEGMENTED MIRROR TELESCOPE MODEL AND SIMULATION

SEGMENTED MIRROR TELESCOPE MODEL AND SIMULATION

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作者： Travis W. Axtell Naval Postgraduate School

学位级别：硕士

The Segmented Mirror Telescope (SMT) housed at the Naval Postgraduate School is a unique, state-of-the-art optical instrument built to explore new technologies needed for future space-based telescopes. A discrete Fourier transform wavefront reconstruction technique developed at Lawrence Livermore National Laboratory is discussed in this thesis as applied to a hexagonal aperture. A Fourier domain implementation of a spatial-frequency modal controller for a simple spring-mass model of a deformable mirror surface is provided by this thesis. This technique avoids more difficult time-domain solutions, is computationally efficient and scalable to much larger multi-input, multi-output systems than the SMT.

关键词： Space telescope Segmented mirror Adaptive optics Wavefront reconstruction Spatial-frequency modal controller multi-input multi-output

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2.4/5 GHz WLAN 4x4 MIMO Dual Band Antenna Box Design for Smart White Good Applications 4

2.4/5 GHz WLAN 4x4 MIMO Dual Band Antenna Box Design for Sma...

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4th International Symposium on multidisciplinary Studies and Innovative Technologies, ISMSIT 2020

作者： Gocen, Cem Akdag, Ismail Palandoken, Merih Kaya, Adnan Izmir Katip Çelebi University Department of Electric and Electronic Engineering Izmir Turkey

ISBN: (纸本)9781728190907

In this study, a 4x4 MIMO antenna box design consisting of antenna designs by using planar metal (Aluminum) plate and substrate (FR-4) used traditionally is presented to be used in smart home white good applications. The antenna designs that make up the antenna box operate as dual-band in 2.4 and 5 GHz WLAN and the operating bands and resonance frequencies are verified by both simulation and measurement results. In the resonance frequencies at 2.4 and 5 GHz WLAN operating bands 80, 110, and 700, 600 MHz operating bandwidth and at these bands minimum 15, 20 and 30, 20 dB isolation values between antennas have been achieved in simulation, respectively. Also, important MIMO antenna parameters have been examined in the simulation environment;In the 2.4 and 5 GHz operating bands, the envelope correlation coefficient maximum 0.18, 0.2 and 0.01, 0.02, diversity gain as minimum 9.1, 8.95 and 9.9, 9.85 have been obtained between the same type antennas, respectively. © 2020 IEEE.

关键词： antenna array metal antenna microstrip antenna multi-input multi-output wireless communication WLAN

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用于5G多波束MIMO系统的先进低温共烧陶瓷封装的39 GHz双信道收发器芯片组

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Engineering 2023年第3期22卷 125-140页

作者：尹宇明 Zhilin Chen 赵晨曦刘辉华吴韵秋 Wen-Yan Yin 康凯 School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310058China

本文介绍了一种用于5G多输入多输出(MIMO)应用的39 GHz收发器前端芯片组。每个芯片包括两个可变增益的频率转换通道,可以同时支持两个独立波束,芯片还集成了一个本地振荡器链和数字模块,用于多芯片扩展和增益状态控制。为了提高射频性能... 详细信息

本文介绍了一种用于5G多输入多输出(MIMO)应用的39 GHz收发器前端芯片组。每个芯片包括两个可变增益的频率转换通道,可以同时支持两个独立波束,芯片还集成了一个本地振荡器链和数字模块,用于多芯片扩展和增益状态控制。为了提高射频性能,对前端系统的关键模块提出了几种电路级改进技术。此外,开发了一种先进的低温共烧陶瓷工艺来封装39 GHz双通道收发器芯片组,实现了低封装损耗和两个发射(TX)/接收(RX)通道之间的高隔离。进行了芯片级和系统级封装(SIP)测量,以演示收发器芯片组的性能。测量结果表明,TX SIP的最大增益为11 dB,饱和输出功率为10 dBm;RX SIP的最大增益为52 dB,噪声系数为5.4 dB,输出压缩点为7.2 dBm。该收发器的单通道通信链路测试表明,64正交调幅(QAM)调制的误差矢量幅度(EVM)为3.72%,频谱效率为3.25 bit·s^(−1)·Hz^(−1);256-QAM调制在1 m距离上的误差矢量幅度(EVM)为3.76%,频谱效率为3.9 bit·s^(−1)·Hz^(−1)。基于该芯片组,还开发了39 GHz多波束原型,用于执行5G毫米波应用的MIMO操作。单流和双流传输的空中通信链路表明,多波束原型机可以覆盖5~150 m的距离,吞吐量相当。

关键词： 5G multi-beam multi-input multi-output Millimeter-wave Transceiver Wireless communication

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Integration of Photovoltaic-Based Transformerless High Step-Up Dual-output-Dual-input Converter with Low Power Losses for Energy Storage Applications

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ENERGIES 2022年第15期15卷 5559页

作者： Aljafari, Belqasem Ramu, Senthil Kumar Devarajan, Gunapriya Vairavasundaram, Indragandhi Najran Univ Coll Engn Dept Elect Engn Najran 11001 Saudi Arabia Sri Krishna Coll Technol Autonomous Dept Elect & Elect Engn Coimbatore 641042 Tamil Nadu India Sri Eshwar Coll Engn Dept Elect & Elect Engn Coimbatore 641202 Tamil Nadu India Vellore Inst Technol Sch Elect Engn Vellore 632014 Tamil Nadu India

The synchronous integration of numerous input and output loads is possible with multi-input (MI) and multi-output (MO) DC-DC converters. In this paper, the non-isolated DC-DC converter described, which has a high step-up capability and multiple ports for outputs and inputs for energy storage system (ESS) applications. The voltage level of the converter is changeable. The capacity to provide the large voltage increases with a low duty cycle portion, the ease with which each duty cycle can be controlled, and minimal power losses are all advantages of the proposed design. The proposed system offers advantages for applications requiring energy storage. In the continuous conduction mode (CCM), the operation principles, steady-state evaluation, and extracting of the voltage and current coefficients are performed. The supply sources can be inserted or withdrawn without causing a cross-regulation issue in the proposed converter. Ultimately, the functionality of the proposed structure is examined using simulation and the laboratory prototype that has been implemented. The proposed converter achieved 94.3% efficiency at maximum power. In addition, the proposed converter attained minimum losses with a difference of 28.5 W when compared to a conventional converter.

关键词： multi-input multi-output step-up converter energy storage DC-DC converter

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Sparsity Adaptive Expectation Maximization Algorithm for Estimating Channels in MIMO Cooperation systems

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KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS 2016年第8期10卷 3498-3511页

作者： Zhang, Aihua Yang, Shouyi Li, Jianjun Li, Chunlei Liu, Zhoufeng Zhongyuan Univ Technol Sch Elect & Informat Engn Zhengzhou Peoples R China Zhengzhou Univ Sch Informat Engn Zhengzhou Peoples R China

We investigate the channel state information (CSI) in multi-input multi-output (MIMO) cooperative networks that employ the amplify-and-forward transmission scheme. Least squares and expectation conditional maximization have been proposed in the system. However, neither of these two approaches takes advantage of channel sparsity, and they cause estimation performance loss. Unlike linear channel estimation methods, several compressed channel estimation methods are proposed in this study to exploit the sparsity of the MIMO cooperative channels based on the theory of compressed sensing. First, the channel estimation problem is formulated as a compressed sensing problem by using sparse decomposition theory. Second, the lower bound is derived for the estimation, and the MIMO relay channel is reconstructed via compressive sampling matching pursuit algorithms. Finally, based on this model, we propose a novel algorithm so called sparsity adaptive expectation maximization (SAEM) by using Kalman filter and expectation maximization algorithm so that it can exploit channel sparsity alternatively and also track the true support set of time-varying channel. Kalman filter is used to provide soft information of transmitted signals to the EM-based algorithm. Various numerical simulation results indicate that the proposed sparse channel estimation technique outperforms the previous estimation schemes.

关键词： multi-input multi-output one-way relay networks adaptive compressed channel estimation sparsity adaptive expectation maximization amplify-and-forward

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Spatial diversity gain of MIMO single frequency network in passive coherent location

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SCIENTIA IRANICA 2014年第6期21卷 2186-2199页

作者： Radmard, M. Majd, M. Nazari Chitgarha, M. M. Khalaj, B. H. Nayebi, M. M. Sharif Univ Technol Sch Elect Engn Tehran Iran

Recently, it has been shown that applying MIMO technology, i.e. using multiple antennas at the transmit side and multiple antennas at the receive side, improves the performance of object detection and localization. In such scenarios, the spatial diversity specifically helps overcome the fading of the cross section of the object, leading to reduced probability of missed detection. Such a phenomenon is, in fact, the dual of probability of bit error reduction in communication systems due to diversity gain. Despite the importance of such performance enhancement, this subject has not been sufficiently investigated in the PCL (Passive Coherent Location) schemes, where the transmitters (or illuminators of opportunity) used for localization are already present in the environment. Especially, in cases where the transmitters are working in a SFN (Single Frequency Network), such as the DVB-T (Digital Video Broadcasting-Terrestrial) signal, and all are transmitting the same signal, the situation becomes of higher importance. Obviously, the effect of the SFN environment invalidates the assumption of sending orthogonal waveforms traditionally used in localization schemes. In this paper, we design the Neyman-Pearson detector for a PCL scheme and show that we can achieve the desired diversity gain for such a design as well. (C) 2014 Sharif University of Technology. All rights reserved.

关键词： multi-input multi-output Spatial Diversity Single Frequency Network Passive Coherent Location

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Performance Analysis and Evaluation of Inter-Satellite Optical Wireless Communication System (IsOWC) from GEO to LEO at Range 45000 km

IEEE PHOTONICS JOURNAL

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IEEE PHOTONICS JOURNAL 2021年第4期13卷 1页

作者： Tawfik, Mohamed Mohsen Sree, Mohamed Fathy Abo Abaza, Mohamed Ghouz, Hussein Hamed Mahmoud Arab Acad Sci Technol & Maritime Transport Cairo 11865 Egypt Arab Acad Sci Technol & Maritime Transport Dept Elect & Commun Engn Giza 12577 Egypt

The importance of free-space optical (FSO) communication has increased during the last decade, introducing its unique features such as its high data rate, license-free spectrum, ease of deployability, and low power consumption. In the future, communication between low earth orbit (LEO) and geostationary earth orbit (GEO) satellites will be commonly established by using intersatellite optical wireless communication (IsOWC) systems. That enables GEO satellites to relay information to and from LEO satellites and fixed Earth stations that otherwise cannot transmit/receive data permanently. IsOWC systems are the most effective application of the FSO, and they will be favorited shortly because of their features. In this work, we established an IsOWC between GEO and LEO satellites at a distance of 45000 km to achieve a target bit error rate (BER) equal to 10(-6). Furthermore, we proposed an IsOWC system with suitable operating wavelengths. Physical techniques such as the multi-input multi-output(MIMO) technique and a wave division multiplexing (WDM) technique are employed.

关键词： Free-space optical communication inter-satellite optical wireless communication multi-input multi-output Q factor wave division multiplexing

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multipath Ghost and Side/Grating Lobe Suppression Based on Stacked Generative Adversarial Nets in MIMO Through-Wall Radar Imaging

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IEEE ACCESS 2019年 7卷 143367-143380页

作者： Jia, Yong Guo, Yong Chen, Shengyi Song, Ruiyuan Wang, Gang Zhong, Xiaoling Yan, Chao Cui, Guolong Chengdu Univ Technol Coll Informat Sci & Technol Chengdu 610059 Sichuan Peoples R China Univ Elect Sci & Technol China Sch Elect Engn Chengdu 611731 Sichuan Peoples R China

For multi-input multi-output (MIMO) through-wall radar imaging (TWRI), multipath ghosts and side/grating lobe artifacts degrade the imaging quality of the obscured targets inside an enclosed building, therein hindering target detection. In this paper, an approach based on two stacked generative adversarial nets (GAN) is proposed to achieve multipath and side/grating lobe suppression with regard to MIMO TWRI. Specifically, the Stage-I GAN constructs a spatial structure mapping from the original input images to the Stage-I GAN output images with the suppressed multipath ghosts. However, the side/grating lobe artifacts are intentionally preserved in the stage-I GAN as additional constraint information to prevent uncontrollable over-fitting. Then, the Stage-II GAN takes the output images of Stage-I GAN as input to suppress the side/grating lobe artifacts. Extensive electromagnetic simulations and comparisons demonstrate that the proposed approach achieves better suppression of multipath ghosts and side/grating lobe artifacts and other significant superiorities, including priori wall information not being required, the preservation of weak targets, and robustness for different array deployments and building layouts.

关键词： Stacked generative adversarial nets multi-input multi-output through-wall radar imaging multipath ghosts side/grating lobe artifacts

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