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Dual-element circularly polarized multiple-input-multiple-output-dielectric resonator antenna with high interport isolation for sub-6 GHz applications

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2022年第11期32卷

作者： Mali, Ravi Sahu, Nikesh Kumar Suman, Kundan Kumar Gangwar, Ravi Kumar IIT ISM Dhanbad Dept Elect Engn Dhanbad 826004 Jharkhand India

This work presents a dual-element multiple-input-multiple-output (MIMO) dielectric resonator antenna (DRA) for sub-6 GHz applications. The proposed MIMO-DRA has two major features: (i) circular polarization (CP);and (ii) high interport isolation. The proposed MIMO-DRA is formed by two identical antenna elements. Each element is composed of a cylindrical dielectric resonator (DR) which is fed by a microstrip line via the underneath octagonal aperture. A modified L-shaped strip along with the octagonal aperture delivers the desired CP characteristics. Meanwhile, a novel defected ground geometry (DGG) is utilized to enhance the inter-port isolation across the operating frequency bandwidth. The proposed MIMO-DRA has an inter-port isolation of greater than 21 dB over the operating 10-dB impedance band of 4.18-6.12 GHz. Furthermore, the proposed MIMO-DRA features broadside radiation patterns, satisfactory broadside gains, and well-acceptable values of envelope correlation coefficients (ECCs).

关键词： circular polarization dielectric resonator inter-port isolation multiple-input-multiple-output

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Neutralization Line Decoupling Tri-Band multiple-input multiple-output Antenna Design

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IEEE ACCESS 2020年 8卷 27018-27026页

作者： Liu, Ruipeng An, Xing Zheng, Hongxing Wang, Mengjun Gao, Zhenbin Li, Erping Hebei Univ Technol Key Lab Electromagnet Field & Elect Apparat Relia State Key Lab Reliabil & Intelligence Elect Equi Sch Elect Engn Tianjin 300401 Peoples R China Hebei Univ Technol Sch Elect & Informat Engn Tianjin 300401 Peoples R China Zhejiang Univ Univ Illinois Urbana Champaign Inst Haining 314400 Peoples R China

A pair of tri-band multiple-input-multiple-output (MIMO) antennas with high isolation is investigated in this paper. The proposed antenna consists of two monopole antenna elements with an edge to edge spacing of 4 mm (0.03 lambda(0) at 2.3 GHz). The monopole antenna element chose the bending line structure that can operate in tri-band and realize miniaturization. To achieve compact dimension and high isolation, symmetrical distribution layout is adopted to decouple the low frequency band, the U-shaped neutralization line (NL) contacting with two microstrip lines, and it can to improve the isolation in high frequency band, and the inverted U-shaped NL contacting with two radiation patch can decoupling in the middle frequency band. And then study the envelope correlation coefficient is lower, and the radiation pattern in operation bands is quasi-omnidirectional. It indicates that the antenna has obtained a satisfactory diversity performance within the whole operation bands which can be a good candidate for some portable MIMO applications.

关键词： multiple-input-multiple-output tri-band high isolation neutralization line

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A 100-Gb/s multiple-input multiple-output Visible Laser Light Communication System

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2014年第24期32卷 4121-4127页

作者： Chang, Ching-Hung Li, Chung-Yi Lu, Hai-Han Lin, Che-Yu Chen, Jian-Hua Wan, Zhi-Wei Cheng, Chun-Jen Natl Chiayi Univ Dept Elect Engn Chiayi 60004 Taiwan Natl Taipei Univ Technol Inst Electroopt Engn Taipei 10608 Taiwan

A 100-Gb/s multiple-input multiple-output (MIMO) visible laser light communication (VLLC) system employing vertical-cavity surface-emitting lasers with 16-quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) modulating signals is proposed and experimentally demonstrated. The transmission capacity of systems is significantly increased by space-division-multiplexing scheme. With the aid of low-noise amplifier and equalizer at the receiving site, good bit error rate performance and clear constellation map are obtained for each optical channel. A system of eight 16-QAM-OFDM channels over 5-m free-space links with a total data rate of 100 Gb/s (12.5 Gb/s/channel x 8 channels) is successfully achieved. Such a proposed MIMO VLLC system is shown to be a prominent one not only presents its convenience in free-space optical communication, but also reveals its potential for the real implementation.

关键词： multiple-input-multiple-output space-division multiplexing scheme visible laser light communication system

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A TWO-STAGE APPROACH FOR THE ESTIMATION OF multiple input multiple output ACOUSTIC CHANNELS

A TWO-STAGE APPROACH FOR THE ESTIMATION OF MULTIPLE INPUT MU...

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IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Nie, Xingyang Wang, Zhenduo Qu, Fengzhong Xu, Wen Yang, Liuqing Zhejiang Univ Dept Informat Sci & Elect Engn Hangzhou 310027 Zhejiang Peoples R China Zhejiang Univ Ocean Coll Hangzhou 310058 Zhejiang Peoples R China Colorado State Univ Dept Elect & Comp Engn Ft Collins CO 80523 USA

ISBN: (纸本)9781479952748

Underwater acoustic communication (UWA) is a reliable way for data transmission in underwater environment, however, it is quite challenging due to its doubly spread characteristics as delay spread and Doppler spread. In this paper, a discrete-time channel input-output relationship for multiple-input-multiple-output (MIMO) single-carrier block transmissions is derived based on parameterization for amplitude and delay variations with polynomial fitting, where the mathematical model is characterized by a few parameter sets, transforming the estimation problem into estimation of the low-dimensional parameter sets. Then a two-stage sparse approach for delay-spread and Doppler-scale estimation of MIMO UWA channel is proposed, using orthogonal matching pursuit (OMP) algorithm to search on the delay-Doppler scale grid. The results of the proposed approach are further evaluated by simulations.

关键词： Underwater acoustic communication multiple-input-multiple-output Two-stage channel estimation

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Power Allocation for multiple input multiple output system using Particle swarm optimization 5

Power Allocation for Multiple Input Multiple Output system u...

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5th International Conference on Inventive Computation Technologies (ICICT)

作者： Rao, G. Koteswar Laxminarayana, G. JNTU Hyderabad ECE Dept Hyderabad Telangana India JNTU Hyderabad Anuraag Coll Engn Hyderabad Telangana India

ISBN: (纸本)9781728146850

multiple input multiple output(MEVIO) system is a new antenna technology in wireless communications. It has several antennas in both transmitting and receiving end and itis a frequency selective for multiple path characteristics. Orthogonal-Frequency-Division-multiplexing is used to getting higher data rates in wireless communication systems. MIMO with OFDM system is used for converting the frequency selection channels into a parallel combination of frequency flat sub-channels. Due to the atmospheric conditions, some noises such as AWGN are added in the channels. So the system performance will be degraded. To enhance the reliability of the MIMO-OFDM system uses STBC scheme. Here to minimize the BER by allocating the power at transmitter using Particle-Swarm-Optimization (PSO) algorithm. The allocation of power at transmitting end and pilot tones optimization mainly depends on the diagonal matrix which is from the QR-decomposition of the channel matrix. The system performances of the proposed method are analyzed in terms of bit error rate and signal to noise ratio.

关键词： multiple-input-multiple-output Orthogonal-frequency-division-multiplexing Space- time-block-coding Particle Swarm Optimization Power allocation Bit error rate Signal to noise ratio

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RIS-Aided MIMO Communications: Angle-Dependent Amplitude-Phase Response Model and Capacity Analysis

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IEEE WIRELESS COMMUNICATIONS LETTERS 2025年第2期14卷 290-294页

作者： Xu, Bilian Zhou, Ting Gao, Feifei Xu, Tianheng Hu, Honglin Shanghai Univ Sch Microelect Shanghai 200444 Peoples R China Tsinghua Univ Dept Automat Beijing 100084 Peoples R China Chinese Acad Sci Shanghai Adv Res Inst Shanghai 201210 Peoples R China

Most phase-shift models for reconfigurable intelligent surfaces (RIS) rely on ideal models of the reflection coefficient, i.e., assuming full-reflection amplitude and constant reflection coefficient for any incident angle. Since electromagnetic waves incident on RIS from varying directions exhibit different responses, ideal phase-shift models may overestimate the capacity gain of the RIS-aided multiple-input-multiple-output (MIMO) communications system. With varactor diode-based RIS, this letter performs full-wave simulation to verify the impact of incident angle on its reflection coefficient. Specifically, we first propose an angle-dependent amplitude-phase response model. The proposed model is then applied to a RIS-aided MIMO communications system, where the capacity maximization problem is formulated and solved via joint RIS reflection coefficients and transmit covariance matrix optimization. Simulation results quantify the capacity gain achieved by RIS with varying incident angles.

关键词： Reflection coefficient Reflection Varactors MIMO communication Optimization Mathematical models Capacitance Linear programming Electromagnetic scattering Reconfigurable intelligent surface full-wave simulation incident angle-dependent characteristics system capacity multiple-input-multiple-output multiple-input-multiple-output

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Reconfigurable Intelligent Surface Aided MIMO Wireless Power Transfer With multiple Energy Harvesting Requirements

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2025年第2期74卷 3539-3544页

作者： Ma, Hui Zhang, Haijun Liu, Liang Wang, Xianmei Leung, Victor C. M. Univ Sci & Technol Beijing Sch Comp & Commun Engn Beijing 100083 Peoples R China China Acad Space Technol Inst Telecommun & Nav Satellites Beijing 100094 Peoples R China Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen 518060 Peoples R China

In this correspondence, a reconfigurable intelligent surface (RIS) assisted wireless power transfer system where a multi-antenna energy station (ES) transmits energy beams to multi-antenna energy receivers (ERs) is considered. We aim at optimizing the ES beamforming and the RIS beamforming to minimize the transmit power of the ES under individual energy harvesting constraints for ERs. To handle the beamforming optimization problem, we develop an algorithm where an alternating direction method of multipliers based scheme is put forward for the RIS beamforming optimization. Compared with the counterpart which relies on semidefinite relaxation to optimize the RIS beamforming, the complexity of the proposed beamforming optimization algorithm is significantly reduced. Simulation results illustrate that the proposed algorithm performs close to the counterpart, which implies that the complexity reduction is achieved at very limited expense of performance.

关键词： Array signal processing Optimization Complexity theory Wireless power transfer MISO communication Energy harvesting Vectors Receivers MIMO communication Internet of Things Beamforming multiple-input-multiple-output Reconfigurable intelligent surface wireless power transfer

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Tensor-Based Sparsity-Inducing Localization of AAV Swarms-Assisted Mobile Edge Computing Systems

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IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS 2025年第3期21卷 2074-2083页

作者： Wang, Yuexian Zhang, Zhaolin Luo, Shuai Kumar, Neeraj Wang, Ling Tellambura, Chintha Rodrigues, Joel J. P. C. Northwestern Polytech Univ Sch Elect & Informat Xian 710072 Peoples R China Northwestern Polytech Univ Natl Key Lab Autonomous Aerial Vehicle Technol Xian 710072 Peoples R China Thapar Inst Engn & Technol Dept Comp Sci & Engn Patiala 147004 India Univ Econ & Human Sci Dept Comp Sci PL-01043 Warsaw Poland Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 1H9 Canada Univ Fed Piaui FPPGEE Teresina PI Brazil

Autonomous aerial vehicle (AAV)-assisted mobile edge computing systems have high mobility and can be deployed in various rugged terrain and emergency scenarios for communication and monitoring. However, the malicious use of AAV swarms poses a potential threat to key areas. Therefore, accurate positioning of AAV swarms is crucial for the security of high-value civilian facilities and equipment. This article investigates angle estimation of coherent signals from AAV swarms in bistatic multiple-input multiple-output radar under nonuniform noise. The nonuniform noise powers are iteratively estimated based on the structural characteristics of the covariance matrix and subsequently removed from the observations. Transmission-reception diversity smoothing is then applied to the signal subspace, obtained through higher order singular value decomposition, to recover the rank deficiency. Furthermore, a block sparse reconstruction method is proposed, utilizing the reweighted smoothed $\ell _multiple$-norm, to obtain angle estimates. This method automatically pairs the direction-of-arrivals and direction-of-departures of AAVs. Experimental results demonstrate the superiority of our approach over existing solutions.

关键词： Noise Covariance matrices MIMO radar Estimation Smoothing methods Location awareness Direction-of-arrival estimation Accuracy Fading channels Iterative methods Coherent signals multiple-input-multiple-output nonuniform noise sparse reconstruction autonomous aerial vehicle (AAV) swarm

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Optimizing Small Cell Performance: A New MIMO Paradigm With Distributed ASTAR-RISs

IEEE OPEN JOURNAL OF VEHICULAR TECHNOLOGY

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IEEE OPEN JOURNAL OF VEHICULAR TECHNOLOGY 2025年 6卷 128-144页

作者： Ahmed, Shakil Kamal, Ahmed E. Selim, Mohamed Y. Hossain, Md Akbar Sabuj, Saifur Rahman Iowa State Univ Dept Elect & Comp Engn Ames IA 50011 USA Eastern Inst Technol Sch Comp Auckland 1010 New Zealand Brac Univ Dept Elect & Elect Engn Dhaka 1212 Bangladesh

As the demand for high-speed data transmission grows with the expected emergence of 6G networks and the proliferation of wireless devices, more than traditional wireless infrastructure may be required. Small cell networks (ScNs) integrated with reconfigurable intelligent surfaces (RISs) and multiple-inputmultiple-output (MIMO) have emerged as promising solutions to address this issue. However, ScNs have resource allocation limitations, and traditional RISs can only reflect signals in a limited propagation space of 1800 with fixed reflection properties. This paper proposes a novel approach to overcome these challenges by introducing actively simultaneously transmitting and reflecting (ASTAR)-RISs. Unlike conventional RIS, ASTAR-RISs actively amplify and transmit signals, effectively mitigating the limited propagation challenge and improving signal strength, especially in dense ScNs. This approach enhances the quality of service in complex channel environments by amplifying, on top of reflection, from the macro base station (mBS), improving the overall signal strength, and providing 3600 flexible propagation space. Furthermore, ASTAR-RIS enables dynamic beam management, significantly improving signal coverage and interference management, which are crucial in dense deployments. In this work, we propose a network architecture where distributed ASTAR-RIS units are deployed to assist small cell mBSs by optimizing signal coverage and enhancing communication performance. ASTAR-RISs dynamically control signal reflection and amplification, complementing the functionality of traditional small-cell BSs in dense network environments. Using the MIMO technique, we design phase shifts for ASTAR elements and develop optimal hybrid beamforming for users at the mBS. We dynamically control the ON/OFF status of the ASTAR-RIS based on active or idle status. We propose an efficient model that ensures fairness of signal-to-noise ratio (SNR) for all users and minimizes overall power consump

关键词： Reflection Array signal processing Signal to noise ratio Optimization Energy consumption 6G mobile communication Reconfigurable intelligent surfaces Vehicle dynamics Vehicular and wireless technologies Interference Actively simultaneously transmitting and reflecting reconfigurable intelligent surfaces hybrid beamforming multiple-input-multiple-output small cell networks

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3D Channel Modeling and Analysis of Channel Statistical Properties for UAVs Based on Different Distributions

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IEEE COMMUNICATIONS LETTERS 2025年第4期29卷 819-823页

作者： Sun, Rongchen Meng, Lingyang Sun, Zhiguo Wang, Zhenduo Harbin Engn Univ Coll Informat & Commun Engn Harbin 150001 Peoples R China

This letter proposes a novel three-dimensional geometry-based stochastic model (GBSM) for multiple-input-multiple-output (MIMO) channels in unmanned aerial vehicle (UAV) air-to-ground (A2G) communication systems. To address the limited consideration of complex urban environments in existing UAV models, this model specifically accounts for the significant impact of ground objects on A2G communications and analyzes how different ground scatterer distributions affect signal propagation. The study examines the effects of UAV angle and altitude on the statistical characteristics of the channel. Results indicate that channel correlation is closely tied to UAV angle and altitude, with Gaussian and uniform scatterer distributions impacting channel statistics differently. Simulation results exhibit high consistency with measurement data, providing a more accurate framework for the design and performance analysis of UAV communication systems.

关键词： Autonomous aerial vehicles Stochastic processes Adaptation models Atmospheric modeling Analytical models Computational modeling Antenna arrays Accuracy Scattering Channel models Unmanned aerial vehicle geometry-based stochastic model multiple-input-multiple-output statistical characteristics

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