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A novel moon-shaped flexible four-element co-planar antenna for 5G applications

OPTICAL AND QUANTUM ELECTRONICS 2024年第10期56卷 1-15页

作者： Sundaravadivel, P. Raja, M. Ramkumar Annadurai, C. Kumar, D. Rajesh Saveetha Engn Coll Dept Artificial Intelligence & Machine Learning Chennai India King Khalid Univ Coll Engn Dept Elect Engn Abha Saudi Arabia Sri Sivasubramaniya Nadar Coll Engn Dept ECE Chennai 603110 India Vel Tech Rangarajan Dr Sagunthala R&D Inst Sci & T Dept Elect & Commun Engn Chennai India

This paper introduces a novel design concept for a compact sub-6 GHz four-port flexible antenna tailored specifically for 5G applications. The antenna utilizes a coplanar waveguide (CPW) architecture featuring a moon-shaped radiating element, implemented on a flexible Felt substrate with a dielectric constant of 1.2. Operating within the 3.4 to 3.8 GHz spectrum, the antenna underwent fabrication and rigorous measurement. Remarkably, the measured results closely matched the simulated outcomes, validating the design's accuracy. Furthermore, various MIMO parameters such as envelop correlation coefficient (ECC), total active reflection coefficient (TARC), channel capacity loss (CCL), diversity gain (DG), and mean effective gain (MEG) were computed, providing comprehensive insights into the antenna's performance metrics. An analysis of the antenna's conformability confirms its suitability for integration across diverse 5G applications. Overall, the findings demonstrate that the proposed antenna exhibits promising characteristics, making it an ideal candidate to meet the evolving demands of 5G communication systems.

关键词： Flexible antenna multi-input multi-output Sub-6 GHz Fifth generation Coplanar waveguide

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Robust MIMO Precoding for Cognitive multiuser Relay Networks with Imperfect Channel State Information

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Transactions of Tianjin University 2016年第6期22卷 590-595页

作者：俎云霄揭昕政 School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

In this paper, a novel robust precoder with imperfect channel state information(CSI)is proposed for multi-input multi-output(MIMO)cognitive multiuser networks equipped with relays. In the proposed model, the secondary users(SUs)are allowed to share the spectrum with the primary users(PUs)when the interference temperature(IT)is below a specific threshold. The transmitting strategy of relays is amplify-and-forward(AF), and the CSI error is characterized in terms of spherical uncertainty region. A minmax problem for the transmit power of the relays is considered when the mean square error(MSE)of SUs and the IT of PU meet their corresponding thresholds, and it is transformed into a semi-definite programming(SDP)problem to search for the solution. Numerical simulations demonstrate the effectiveness of the proposed precoder.

关键词： cognitive radio multi-input multi-output imperfect channel state information semi-definite programming robust precoding

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Interval Forecasting of Financial Time Series by Accelerated Particle Swarm-Optimized multi-output Machine Learning System

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IEEE ACCESS 2020年 8卷 14798-14808页

作者： Chou, Jui-Sheng Dinh-Nhat Truong Thuy-Linh Le Natl Taiwan Univ Sci & Technol Dept Civil & Construct Engn Taipei 10607 Taiwan Univ Technol & Educ Univ Danang Dept Ind Educ Danang 550000 Vietnam

By providing a range of values rather than a point estimate, accurate interval forecasting is critical to the success of investment decisions in exchange rate markets. This work proposes a sliding-window metaheuristic optimization for interval-valued time series forecasting using multi-output least squares support vector regression (MLSSVR). The hyperparameters in MLSSVR are finetuned using an accelerated particle swarm optimization algorithm to yield the best predictions and fastest convergence. The proposed system has a graphical user interface that is developed in a computing environment and functions as a stand-alone application. The system is validated using stock prices as well as exchange rates and outputs are compared with published results. Finally, the proposed interval time series prediction method is tested in two case studies;one involves the daily Australian dollar and Japanese yen rates (AUD/JPY) and the other involves US dollar and Canadian dollar rates (USD/CAD). The proposed model is promising for interval time series forecasting.

关键词： Sliding window multi-input multi-output time series interval forecasting financial services industry accelerated particle swarm optimization least squares support vector regression hybrid system

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Performance Study of MIMO-OSTBC Parallel Relay FSO System Based on GFDM

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Chinese Journal of Electronics 2024年第2期33卷 564-572页

作者： Rui ZHOU Yong WANG Yi WANG Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province College of Information Engineering China Jiliang University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

This paper investigates the performance of a new generalized frequency division multiplexing(GFDM)parallel relay free space optical(FSO) communication system using multi-input multi-output(MIMO) orthogonal space-time block codes(OSTBC) scheme. Under the M distribution atmospheric turbulence, taking into account the triple effects of irradiance, pointing errors and path loss, the mathematical expression of system symbol error rate is derived with the help of Meijer G-function. The symbol error performance of GFDM is compared with on-off keying,Gaussian minimum shift keying, polarization shift keying and orthogonal frequency division multiplexing(OFDM)modulation methods. The effects of the MIMO-OSTBC parallel relay scheme on the GFDM system including filter roll down coefficient, the number of transmitting and receiving antennas, the number of relays, normalized beamwidth and jitter variance are analyzed, and the numerical results are verified by Monte Carlo simulation. This work provides a good foundation for engineering applications.

关键词： Free-space optical Generalized frequency division multiplexing multi-input multi-output Orthogonal space-time block codes Parallel relay

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Experimental modelling and estimation of time varying thermal sources

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INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2003年第3期42卷 255-265页

作者： Videcoq, E Petit, D Piteau, A IUT Genie Therm & Energie F-91731 Bretigny Sur Orge France ENSMA UMR 6608 Lab Etud Therm F-86960 Futuroscope France

This paper shows an experimental design where two steps are carried out: (i) the identification of a low order state representation through temperature evolutions corresponding to step responses of a system, (ii) the use of this model to solve an inverse heat conduction problem (IHCP) consisting in the estimation of several strength variations generated by heat sources from time-varying temperature evolutions. Experiments are realized on a 3D heat conductive system (a thick stainless steel tube) in which are set four heat sources, a fifth thermal strength consists in an applied flux boundary condition. After the model identification, a sequential method is used for the resolution of the IHCP: from temperature measurements, the evolutions of the five strengths are identified and compared to the electrical measurements. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

关键词： 3D heat conduction inverse problem experiment linear system dominant eigenmodes experimental modelling heat source strength estimation function specification future time steps multi-input multi-output

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Performance of multiuser MIMO-SWIPT Layered Transmission Systems 31

Performance of Multiuser MIMO-SWIPT Layered Transmission Sys...

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31st IEEE Conference on Signal Processing and Communications Applications (SIU)

作者： Ozyurt, Serdar Kucur, Oguz Ankara Yildirim Beyazit Univ Elekt Elekt Muhendisligi Bolumu Ankara Turkiye Gebze Tekn Univ Elekt Muhendisligi Bolumu Kocaeli Turkiye

ISBN: (纸本)9798350343557

In this study, the performance of multiuser multi-input multi-output (MIMO) simultaneous wireless information and power transfer (SWIPT) layered transmission system is investigated under downlink scenario. For the first time in the literature, each user is assumed to simultaneously perform energy harvesting (EH) and information decoding (ID) under the MIMO-SWIPT layered transmission system. To this end, antenna switching technique is used at the receivers and the idea that while a set of receive antennas is reserved for EH, the remaining antennas are exploited for ID is adopted. In addition, power-domain non-orthogonal multiple access is utilized for multiuser multiple access process. A number of numerical results are presented on the amount of harvested energy, attained data rate, and outage probability.

关键词： Simultaneous wireless information and power transfer multi-input multi-output non-orthogonal multiple access downlink

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A robust controller for non-linear MIMO systems using radial basis function neural network

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART I-JOURNAL OF SYSTEMS AND CONTROL ENGINEERING 2011年第I5期225卷 667-682页

作者： Al-Duwaish, H. N. Rizvi, S. Z. King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

This paper presents a controller design method for multi-input multi-output nonlinear systems using the artificial neural network. The designed controller uses radial basis function networks to generate optimal control signals abiding by constraints, if any, on the control signal, or on the system output. The salient features of the proposed controller include: no requirement of the explicit knowledge of the states of the system, no requirement of a priori knowledge of the non-linear model of the system, and ability of the controller to control time-varying systems or systems having non-minimum-phase characteristics. A recursive algorithm is developed to update the weights of the neural network. Non-linearities in the system as well as variations in system parameters are compensated by the neural network. Simulation results for non-linear systems are included at the end, and controller performance is analysed. A practical case study of single area non-linear automatic generation control is also considered to test the performance of the controller.

关键词： multi-input multi-output radial basis functions constraints optimal control signals non-linearities unstable zero dynamics

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An UWB Metamaterial-based Circularly Polarized MIMO Antenna with High Isolation 9

An UWB Metamaterial-based Circularly Polarized MIMO Antenna ...

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9th International Symposium on Telecommunications (IST)

作者： Pouyanfar, Negin Nourinia, Javad Ghobadi, Changiz Pedram, Kioumars Urmia Univ Dept Elect Engn Orumiyeh Iran

ISBN: (纸本)9781538682746

An ultra-wideband, (UWB), multi-input multioutput, (MIMO), metamaterial-inspired antenna has been proposed in this paper. The wideband and high isolation is achieved through using Defected Ground Structure, (DGS), and Complementary Split Ring Resonators, (CSRR). The compact UWB antenna provides circular polarization, (CP), in some desired frequencies which makes it a suitable candidate for wireless applications and radar systems. Acceptable agreement between simulation and measured results is obtained. The proposed structure can be an appropriate candidate for modern wireless systems.

关键词： UWB multi-input multi-output Defected Ground Structure Complementary Split Ring Resonator Circular Polarization

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An Efficient PLS Scheme for Coded MIMO Systems under Imperfect Channel Estimation

An Efficient PLS Scheme for Coded MIMO Systems under Imperfe...

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International Conference on Computing, Networking and Communications (ICNC)

作者： Son, Thara Kim, Sooyoung Jeonbuk Natl Univ IT Convergence Res Ctr Div Elec Eng Jeonju South Korea

ISBN: (纸本)9798350371000;9798350370997

In recent years, the concept of physical layer security (PLS) has emerged as a promising approach to supplement traditional cryptographic solutions. However, many PLS techniques rely on accurate knowledge of the channel state information (CSI) at the transmitter, which can be difficult to obtain in real-world scenarios. This paper presents a physical layer security scheme designed to enhance the security of a coded multi-input multi-output (MIMO) system operating under imperfect channel estimation conditions. To achieve a high level of security, we adopt a strategy that involves a channel-dependent interleaving scheme for the coded MIMO system, and combined additional simple coding schemes to prevent serious performance degradation caused by CSI error. Simulation results presented in this paper demonstrate that the proposed scheme effectively protects the transmitted data without any information leakage to the eavesdropper.

关键词： physical layer security multi-input multi-output bit interleaved coded modulation channel state information estimation error forward error correction

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Research on User Pairing of the multi-User in Orbital Angular Momentum

Research on User Pairing of the Multi-User in Orbital Angula...

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IEEE/CIC International Conference on Communications in China (ICCC)

作者： Wang, Xiaoqian Liang, Xia Zhang, Hao Liu, Guangyi Li, Nan Wang, Qixing China Mobile Res Inst Beijing Peoples R China Beijing Univ Post & Telecommun Beijing Peoples R China

ISBN: (纸本)9781728187556

Orbital angular momentum technology (OAM), as one of the potential technologies of the next generation mobile communication system, has become a hot research point in recent years. OAM technology uses mode multiplexing, which starts another dimension of multiplexing technology and can further improve spectrum efficiency. In this paper, we use the characteristics of OAM coaxial propagation to study the problem of user pairing in the same direction. Simulations show that using OAM for user pairing can significantly increase the number of pairing points compared with multi-input multi-output (MIMO) system. In addition, our scheme can obtain a obvious pairing gain at the specific location.

关键词： Orbital angular momentum user pairing pairing gain multi-input multi-output

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