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Compact self decoupled MIMO antenna pairs covering 3.4-3.6 GHz band for 5G handheld device applications

AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2021年 141卷

作者： Moses, Abi T. Zerith Moses, Nesasudha Karunya Inst Technol & Sci Dept Elect & Commun Engn Coimbatore Tamil Nadu India

A self-decoupled 4-port multiple-input multiple-output (MIMO) antenna pair working in the midband of the 5G spectrum (3.5 GHz) for handheld device application is presented in this paper. The antenna includes two vertically placed blocks printed exactly at the middle of the two lengthy frames of the handheld device. The selfdecoupled antenna pair structure consists of two monopole antenna separated by a distance of 7 mm, a T-shaped parasitic structure, and a stub at the backside connecting the ground plane. The monopole antennas are excited by a simple coaxial feeding structure. The T-shaped element not only serves as a radiator but plays a vital role in providing port isolation between the two ports to obtain a self-isolated antenna pair. The self-decoupled antenna pair operates from 3.4 to 3.6 GHz with isolation higher than 16.5 dB in the entire utilization band. The parametric analysis of the optimal parameters and the evolution design of the antenna pair is studied for a better interpretation of the working principle of the MIMO system. The total efficiency and peak gain of all the antennas are more than 78% and 5 dB respectively in the whole utilization bandwidth. The worst-case envelope correlation coefficient (ECC) value among the elements of the antenna pair is less than 0.03, which is less than the ideal value of 0.5. Other MIMO diversity parameters such as Channel Capacity Loss (CCL), Mean Effective Gain (MEG), Total Active Reflection Coefficient (TARC), and Diversity Gain (DG) of the designed antenna are calculated and analyzed with the measured results. A model of the designed handheld device is fabricated and analyzed. The measured results indicate the suitability of the design for a capable candidate in 5G handheld device applications.

关键词： Sub-6 GHz Self-isolated multiple-input multiple-output Mobile terminal antenna Envelope Correlation Coefficient (ECC) Channel Capacity Loss (CCL)

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SER performance of MIMO full-duplex relay system with channel estimation errors and transceivers hardware impairments

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2021年 136卷 153751-153751页

作者： Ba Cao Nguyen Phan Van Tri Xuan Nam Tran Le The Dung Telecommun Univ Fac Basic Tech Khanh Hoa Vietnam Ho Chi Minh Acad Cryptog Tech Fac Cryptol Ho Chi Minh City Vietnam Le Quy Don Tech Univ Adv Wireless Commun Grp Hanoi Vietnam Ton Duc Thang Univ Inst Computat Sci Div Computat Phys Ho Chi Minh City Vietnam Ton Duc Thang Univ Fac Elect & Elect Engn Ho Chi Minh City Vietnam

In practice, traditional wireless communication systems are often affected by various negative factors such as channel estimation errors (CEE) and transceiver hardware impairments (THI). For in-band full-duplex (FD) communication systems, besides CEE and THI impacts, imperfect self-interference cancellation will significantly degrade the system performance because of residual self-interference (RSI). This paper aims to investigate the performance of a multiple-input multiple-output (MIMO) FD relay (FDR) system in realistic scenarios where the impacts of CEE, THI, and RSI are taken into account. We mathematically derive the exact closed-form expression of symbol error rate (SER) of the considered MIMO-FDR system and validate the derived expression by MonteCarlo simulations. Numerical results indicate that the impacts of three imperfect factors (CEE, THI, and RSI) are remarkable. Specifically, with the considered values of CEE, THI, and RSI, the impact of CEE on the SER is most substantial. Additionally, compared with the ideal system (perfect channel estimations, transceiver hardware, and self-interference cancellation), the SER of the considered system is significantly higher and goes to the error floor fast. Therefore, it is crucial to apply all solutions for reducing the CEE, THI, and RSI in the considered MIMO-FDR system.

关键词： In-band full-duplex multiple-input multiple-output Channel estimation error Transceiver hardware impairments Imperfect self-interference cancellation Symbol error rate

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Design and Implementation of 2D MIMO-Based Optical Camera Communication Using a Light-Emitting Diode Array for Long-Range Monitoring System

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SENSORS 2021年第9期21卷 3023-3023页

作者： Nguyen, Huy Nguyen, Vanhoa Nguyen, Conghoan Bui, Van Jang, Yeongmin Kookmin Univ Dept Elect Engn Seoul 02707 South Korea

Wireless technologies that use radio frequency (RF) waveforms are common in wireless communication systems, such as the mobile communication, satellite system, and Internet of Things (IoT) systems. It is more advantageous than wired communication because of the ease of installation. However, it can negatively impact human health if high frequencies are used to transmit data. Therefore, researchers are exploring the potential of optical wireless communication as an alternative, which uses the visible light bandwidth instead of RF waveforms. Three possibilities are being investigated: visible light communication, light fidelity, and optical camera communication. In this paper, we propose a multiple-input multiple-output modulation scheme using a light-emitting diode (LED) array, which is applicable to the IoT system, based on on-off keying modulation in the time domain. This scheme is compatible with the two popular types of camera in the market, rolling shutter cameras and global shutter cameras, as well as the closed-circuit television camera, which is used in factories, buildings, etc. Despite the small size of the LED array, implementing this scheme with 10 links in different positions at a communication distance of 20 m is possible for efficient performance (low error rate) by controlling the exposure time, shutter speed, focal length, channel coding and applying the matched filter.

关键词： internet of things multiple-input multiple-output on– off keying optical camera communication

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Three-Dimensional Deterministic Detection and Estimation Algorithms for MIMO SFCW Radars

Three-Dimensional Deterministic Detection and Estimation Alg...

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IEEE Radar Conference (RadarConf)

作者： Davoli, Alessandro Sirignano, Emilio Vitetta, Giorgio M. Univ Modena & Reggio Emilia Dept Engn Enzo Ferrari Modena MO Italy

ISBN: (纸本)9781728189420

In this paper, the problem of detection and joint estimation of range, azimuth and elevation of multiple targets in a multiple-input multiple-output stepped-frequency continuous wave radar system is investigated. Two iterative deterministic algorithms are illustrated and their accuracy is assessed on the basis of the raw data acquired from a commercial radar device. Our results evidence that these algorithms achieve similar accuracies, but at the price of substantially different computational efforts.

关键词： Radar multiple-input multiple-output stepped frequency continuous wave

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Autoencoder based Communication System using Multi-Dimensional Constellations 35

Autoencoder based Communication System using Multi-Dimension...

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35th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC)

作者： Lee, Hyungje Eom, Chahyeon Lee, Hyojin Lee, Chungyong Yonsei Univ Sch Elect & Elect Engn 50 Yonsei Ro Seoul South Korea Samsung Res Samsung Elect 56 Sungchon Gil Seoul South Korea

ISBN: (纸本)9784885523281

This paper proposes an autoencoder based multiple-input multiple-output (MIMO) communication system. The proposed autoencoder learns and optimizes for only line of sight (LOS) component of Rician channel. In addition, we adopt multi-dimensional constellation (MDC) in autoencoder, where it is obtained during learning process of autoencoder by adjusting hyperparameter. Simulation results show that our proposed autoencoder using MDC achieves better symbol error rate (SER) performance compared to conventional communication system which uses quadrature amplitude modulation (QAM) constellation. Furthermore, we confirmed that although proposed autoencoder is learned for only LOS component, it can be applied to random Rician flat fading channels with fading components and channel variation terms.

关键词： autoencoder multiple-input multiple-output multi-dimensional constellation Rician flat fading channel

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Maximum Ergodic Spectral Efficiency of Reconfigurable Intelligent Surface Assisted MIMO Systems under Correlated Channels 12

Maximum Ergodic Spectral Efficiency of Reconfigurable Intell...

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12th International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Wang, Jinghe Wang, Hanqing Han, Yu Jin, Shi Li, Xiao Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Peoples R China

ISBN: (纸本)9781728172361

Recent years have witnessed a growing academic interest in reconfigurable intelligent surface (RIS) since it is a promising technology to satisfy the performance requirements of six generation (6G). Works related to the RISs have been studied by numerous researchers, however, almost existing researches mainly focus on RIS-assisted MIMO systems with the assumption of uncorrelated environments. To date, far too little attention has been paid to situations that consider the correlations among the antennas and RIS reflecting elements. Therefore, in this paper, we focus on a RIS-assisted MIMO system under spatially correlated channels. We first analyze the ergodic spectral efficiency of the system and derive the upper bound of it. In particular, we propose an optimal phase shift design to maximize the ergodic spectral efficiency of the system. Numerical results show the effectiveness of our proposed phase shift design.

关键词： Reconfigurable intelligent surface multiple-input multiple-output Spatially correlated channels Ergodic spectral efficiency

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Joint Power and Feedback Design for Multi-Antenna NOMA Systems with Limited Feedback

Joint Power and Feedback Design for Multi-Antenna NOMA Syste...

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IEEE International Conference on Communications (IEEE ICC) / Workshop on NOMA for 5G and Beyond

作者： Tang, Zhiyao Sun, Liang Feng, Yong Cao, Lu Qi, Shutong Beihang Univ Sch Elect & Informat Engn Beijing Peoples R China Beihang Univ Int Res Inst Multidisciplinary Sci Beijing Peoples R China Kunming Univ Sci & Technol Yunnan Key Lab Comp Technol Applicat Kunming Yunnan Peoples R China

ISBN: (纸本)9781728150895

This paper proposes a multiple-antenna non-orthogonal multiple access scheme including channel state information (CSI) quantization and feedback, user clustering, signal superposition coding, transmit beamforming, and successive interference cancellation at receivers under a general limited CSI feedback framework for frequency duplex division systems. Given a combination of system parameters, we conduct a mathematically strict performance analysis of the considered system, and obtain a closed-form lower bound on the ergodic rate of each user without assuming any extreme for system parameters, which has never been obtained before. Then, we jointly optimize two key parameters, i.e., transmit power and the number of feedback bits allocated to each user, and propose low-complexity closed-form solutions. Finally, numerical results are presented to verify our theoretical results and to illustrate the advantages in accuracy and performance over some existing related results under practical conditions.

关键词： Non-orthogonal multiple access multiple-input multiple-output limited feedback random vector quantization performance analysis

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The First Study of MIMO Scheme Within Rolling-shutter Based Optical Camera Communications 12

The First Study of MIMO Scheme Within Rolling-shutter Based ...

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12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

作者： Teli, Shivani Rajendra Matus, Vicente Zvanovec, Stanislav Perez-Jimenez, Rafael Vitek, Stanislav Ghassemlooy, Zabih Czech Tech Univ Dept Electromagnet Field Prague 16627 Czech Republic ULPGC IDeTIC Las Palmas Gran Canaria Spain Czech Tech Univ Dept Radio Engn Prague 16627 Czech Republic Northumbria Univ Opt Commun Res Grp Newcastle Upon Tyne Tyne & Wear England

ISBN: (纸本)9781728167435

In this paper, we propose the first study of MIMO (multiple-input multiple-output) scheme using a simplified design of MIMO transmitter (Tx) based on grouping of lightemitting diodes (LED) within an array for flicker-free transmission in optical camera based communications (OCC) link. We carried out an initial experimental investigation of indoor static downlink OCC using a Raspberry Pi camera as the receiver with rolling-shutter capturing mode and a 7.2 cm similar to 7.2 cm small 64-neopixel LED array as the Tx. The initial study suggests that, despite the small area of the display, communication links from 20 up to 60 cm can be established.

关键词： Optical camera communications internet of things multiple-input multiple-output rolling shutter lightemitting diodes

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OTA-Based Data Acquisition and Signal Separation for Digital Predistortion of Multi-User MIMO Transmitters in 5G

OTA-Based Data Acquisition and Signal Separation for Digital...

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IEEE/MTT-S International Microwave Symposium (IMS)

作者： Wang, Xiaoyu Li, Yue Yu, Chao Hong, Wei Zhu, Anding Univ Coll Dublin RF & Microwave Res Grp Dublin Ireland Southeast Univ State Key Lab Millimeter Wave Nanjing Peoples R China

ISBN: (纸本)9781728168159

In this paper, a non-interruptive over-the-air (OTA) data acquisition method is presented to characterize system nonlinearity and calibrate digital predistortion (DPD) in multi-user (MU) multiple-input multiple-output (MIMO) transmitters with low hardware complexity. Based on a unified system model for fully-digital and hybrid MU-MIMO transmitters, the requirements and difficulties of data acquisition for MU-MIMO DPD are outlined first. A versatile OTA data acquisition technique, featuring a multi-observation forward modelling procedure, is thereby developed to obtain power amplifier (PA) output without interrupting the operation of the MIMO transmitters. By using this method, the output of each PA can be reconstructed instead of directly measuring each PA's output, even when the output signals of PAs are correlated. DPD can therefore be effectively constructed to mitigate the distortion. Experimental results demonstrate that the proposed approach can accurately estimate each PA output and linearize all PAs in the array.

关键词： 5G digital predistortion multiple-input multiple-output multi-user over-the-air

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Multiband Antenna with Indoor Applications Using Soft Computation Method

Multiband Antenna with Indoor Applications Using Soft Comput...

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Conference on Intelligent Computing, Information and Control Systems (ICICCS)

作者： Kalaiarasan, K. Kavitha, A. Swaminathan, J. N. Vel Tech Rangarajan Dr Sagunthala R&D Inst Sci & Chennai Tamil Nadu India Vel Tech Multi Tech Dr Rangarajan Dr Sakunthala E Chennai Tamil Nadu India Godavari Inst Engn & Technol Rajahmundry Andhra Pradesh India

ISBN: (纸本)9783030304652;9783030304645

To improve the state-of-art data transferring in wireless indoor devices, it is necessary to have an integrated multiple-input multiple-output (MIMO). This paper proposes a fully defined MIMO antenna system for 4G, 5G and wireless LAN networks (WLAN) to obtain high data rate transfer. The integrated MIMO antenna system is able to transfer signals for the frequency of 5 GHz for 5G standards, 13 GHz for future 5G mm-wave band and 2.4 GHz for Wireless LAN network. The design of the antenna system is aimed to achieve more than 5dBi of directivity with an efficiency greater than 60%.

关键词： multiple-input multiple-output Multiband antenna

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