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2020 Cross Strait Radio Science and Wireless Technology Conference

作者： Jing, Guodong Zhu, Yuzhao Xie, Genggeng Zhao, Luyu Xidian Univ Natl Key Lab Antennas & Microwave Technol Xian Shannxi Peoples R China

ISBN: (纸本)9781728181813

In this paper, a dual-band dual-fed MIMO antenna with good return loss and pretty high isolation is proposed. By manipulating the distance between the shorting pins and the feeding ports, very good antenna array performance can be obtained. The -6dB impedance bandwidth can cover both frequency band N41 and N42 (2496-2690MHz and 3.4-3.6GHz), and the isolation between two feeding ports is better than 14dB. The evolution of the antenna and the simulation results will be introduced in detail. This antenna have a great potential for application in mobile terminal industrial products.

关键词： 5G mobile communication Multi-feed technology multiple-input-multiple-output

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A Novel Compact Ultra-Wide Band MIMO Antenna for WLAN 5G & Sub-6GHz Wireless Applications 5

A Novel Compact Ultra-Wide Band MIMO Antenna for WLAN 5G & S...

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5th IEEE International Conference on Computing, Power, and Communication Technologies, IC2PCT 2024

作者： Rana, Sonu Gautam, Anil Kumar Sharma, Sonia Batra, Reenu G.I.T.M. Farrukhnagar Department of Ece Gurgaon India Gbpit Department of Ece Pauri Garhwal India Uiet Department of Ece Rohtak India G.I.T.M. Farrukhnagar Department of Cse Gurgaon India

ISBN: (纸本)9798350383522

This work proposed a dual-element MIMO (multiple-input multiple-output) antenna designed for the WLAN 5GHz and sub-6GHz applications. The proposed antenna has ground structure of an inverted T-shape and two symmetrical hexagon-shaped antenna radiators. Using the CST simulator, antenna attributes such as S-parameters, realized gain, current distribution, and radiation patterns are investigated. Further, the envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and multiplexing efficiency are scrutinized to examine the proposed multi-input multi-output antenna performance for various wireless applications. The antenna resonates across a band from 2.78 to 5.90 GHz (3.12 GHz), covering the whole WLAN 5G and sub-6 GHz frequency band for wireless applications. The extracted result indicates that there is a satisfactory level of agreement with measured outcomes for wireless applications. Furthermore, throughout the band of interest, efficiency and gain were above 4.5 dB and approximately 88%, respectively. © 2024 IEEE.

关键词： CCL DG multiple-input-multiple-output sub-6GHz TARC WLAN

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4.096 Tbit/s multidimensional multiplexing signals transmission over 1000 km few mode fiber

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Chinese Optics Letters 2024年第1期22卷 8-13页

作者：张宇王晨王凯辉丁俊杰朱博文沈磊张磊王瑞春闫长鹍刘博余建军 School of Information Science and Technology Fudan UniversityShanghai 200433China Changfei Optical Fiber and Cable Joint Stock Limited Company Wuhan 430073China Nanjing University of Information Science&Technology Nanjing 210000China

We experimentally transmit eight wavelength-division-multiplexing(WDM)channels,16 quadratic-amplitude-modulation(QAM)signals at 32-GBaud,over 1000 km few mode fiber(FMF).In this experiment,we use WDM,mode division multiplexing,and polarization multiplexing for signal *** the multiple-input-multiple-output(MIMO)equalization algorithms,we achieve the total line transmission rate of 4.096 Tbit/*** results prove that the bit error rates(BERs)for the16QAM signals after 1000 km FMF transmission are below the soft-decision forward-error-correction(SD-FEC)threshold of2.4×10^(-2),and the net rate reaches 3.413 Tbit/*** proposed system provides a reference for the future development of high-capacity communication.

关键词： optical fiber communication mode division multiplexing few-mode fiber multiple-input-multiple-output high-capacity transmission long-distance transmission

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Repeatable Performance Measurements of MIMO Systems in Connected Reverberation Chambers with Controlled Keyhole Effect

Repeatable Performance Measurements of MIMO Systems in Conne...

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作者： Orlenius, C. Brno University of Technology

A straightforward, fast, and repeatable procedure for measuring the system performance of the antennas in a MIMO system is presented. Due to the use of two connected reverberation chambers, the so called keyhole effect is observed and can be controlled. The method is possible to use for performance measurements of complete MIMO systems, and the present paper lays out the basics for making this possible.

关键词： Reverberation chamber multiple-input-multiple-output MIMO antenna characterization

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CSRR-loaded T-shaped MIMO antenna for 5G cellular networks and vehicular communications

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2019年第8期29卷 e21799-e21799页

作者： Rao, Manikonda Venkateswara Madhav, Boddapati T. P. Krishna, Jagupilla Devi, Yalavarthi Usha Anilkumar, Tirunagari Nadh, Badugu Prudhvi Koneru Lakshmaiah Educ Fdn Antennas & Liquid Crystals Res Ctr Vaddeswaram Andhra Pradesh India

This article proposes a multiple input multiple output (MIMO) antenna for 5G-based vehicular communication applications. The designed MIMO antenna consist of two element iterated T-shape antenna with defected ground structure (DGS) and split ring resonator. The antenna providing reflection coefficient S-11 s(11) <= 10 dB and bandwidth of 6.3 and 3.96 GHz over the frequency range of 26.83 to 33.13 GHz and 34.17 to 38.13 GHz, respectively. For the suitable future vehicular millimetric wave communications, this antenna achieved resonant frequencies at 28, 33, and 37 GHz. The designed antenna has achieved peak gain of 7.11 dB in operating band. It is fabricated on 12 x 25.4 x 0.8 mm(3) Rogers RT duroid 5880 substrate with dielectric constant (epsilon(r)) of 2.2. The antenna is placed on vehicle in virtual environmental using ANSYS SAVANT tool and the simulated results are showing good matching with the measured results of proposed MIMO antenna.

关键词： complementary split ring resonator defected ground structures multiple-input-multiple-output T-shaped antenna vehicular communications

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Design of quad-element MIMO antenna with a multi-functional ground topology for UWB wireless applications

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2022年第3期32卷 e22999-e22999页

作者： Mohanty, Asutosh Sahu, Sudhakar KIIT Deemed Univ Sch Elect Engn Bhubaneswar 751024 Odisha India

A hybrid fractal slot printed quad-element MIMO antenna fabricated on a planar hexagonal substrate is proposed in this study. The antenna operates from (2-12) GHz with IBW of 142.85%. The ground topology consists of semi-elliptic structures with defected slots and contorted stubs to form a rotationally symmetric decoupler unit. The defected structures improves bandwidth response and reduce X-pol. Radiations in E-& H-planes, while the contorted stubs improves port-isolations with 17-20 dB. The decoupler unit acts as isolator, resonator and neutralizer. When contorted stubs are introduced, due to the induced coupling effect, impedance matching at lower and upper bands has been improved. The induced coupling effect has in-phase and out-of-phase current modes, which are neutralized generating current NULLS owing to the symmetry of decoupler, thus helps to mitigate the condensed near-field radiating currents. Abovestated facts are supported with the study of surface currents and the analysis explores a leveraged feature in MIMO decoupling mechanism. A prototype antenna of size 1682.78 mm(2) was fabricated and experimented which are in good agreements with the simulation results, which shows potential for UWB wireless and sensing applications.

关键词： hybrid fractal slot antenna hexagonal substrate multiple-input-multiple-output multi-functional decoupling ground UWB wireless applications

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Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

IEEE PHOTONICS JOURNAL

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IEEE PHOTONICS JOURNAL 2023年第3期15卷 1页

作者： Shakir, Wafaa Mohammed Ridha Charafeddine, Jinan Al Satai, Haitham Hamdan, Hani Haddad, Samir Sayah, Jinane Al Furat Al Awsat Tech Univ Comp Syst Dept Babil 51015 Iraq Univ Paris Saclay Pole Sci & technol Velizy Lab Ingenierie Syst Versailles LISVEA4048 F-78140 Saclay France Univ Paris CentraleSupelec CNRS Lab Signauxet SystL2S UMR CNRS 8506 F-91190 Gif Sur Yvette France Univ Balamand Fac Arts & Sci Dept Comp Sci & Math Koura 3936 Lebanon Univ Balamand Issam Fares Fac Technol Dept Telecom & Networks Koura 3936 Lebanon

The security and reliability of free space optical (FSO) communications and the trade-off between the two are the most critical characteristics to emphasize in FSO systems, especially as optical wireless communications continue to evolve. In this work, we investigate the impact of opportunistic transmit aperture selection (TAS) on the security-reliability trade-off (SRT) of the multiuser multiple-input multiple-output (MU-MIMO) free space optical system. We consider a general scenario in which the FSO system consists of a transmitter side with K users and a single receiver withN apertures communicating over generalized MalagaM turbulence channels. We derive the TAS combined signal-tonoise ratio (SNR) distributions for theFSOMIMOchannel between the transmitting users and the receiver. A statistical analysis of the TAS scheme is performed, where the kth best user with the highest SNR is selected. Based on this analysis, the closed-form expressions for the outage probability, average bit error rate, intercept probability, and SRT are derived. Then, the diversity advantages provided by the channel variations considering the atmospheric turbulence and generalized nonzero boresight pointing errors are further discussed. The results showthat the considered TAS significantly improves the security, reliability, and SRT performance and has the potential to solve existing FSO communication problems. Monte Carlo simulations are used to verify the correctness of the numerical results.

关键词： Free space optical security reliability security-reliability trade-off opportunistic scheduling selection transmit aperture selection atmospheric turbulence nonzero boresight pointing errors multiple-input-multiple-output

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Optimization of hybrid high-throughput MIMO system with misaligned FSO link under varied weather

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OPTICAL ENGINEERING 2021年第8期60卷 086106-086106页

作者： Dubey, Dheeraj Prajapati, Yogendra Kumar Tripathi, Rajeev Motilal Nehru Natl Inst Technol Dept Elect & Commun Allahabad Uttar Pradesh India

We investigate the adverse impact of pointing errors (PEs) on the efficiency of free-space optical communication under varied weather conditions using hybrid subcarrier intensity modulation over a fading regime. The error rate is improved by implementing topological permutations at the trans-receiver to achieve a bit error rate of 10(-10). The derived combined probability density function expressions are defined as generalized infinite power series for precision, which supersedes Meijer-G. The outcomes are contrasted with BPSK-SIM and pulse position modulation, validating its agreement with favored aspects. The undesirable influence of PEs is balanced by widening the beam-waist at the expense of the received irradiance in a multiple-input-multiple-output, MIMO(2x2) system, until a normalized jitter cut-off of 3.35. Afterward, single-input-multiple-output, SIMO(1x3), emerges to be more reliable, providing the flexibility to select the optimum order concerning the quality of service. (C) 2021 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： pointing error free-space optics hybrid-subcarrier intensity modulation multiple-input-multiple-output normalized jitter

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A Multi-User Cooperative Diversity for Wireless Local Area Networks

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International Journal of Communications, Network and System Sciences 2008年第3期1卷 266-273页

作者： J. CHEN K. DJOUANI Member IEEE LISSI Lab. University Paris 12 France Member IEEE LISSI Lab. University Paris 12 France Member IEEE CEDRIC-CNAM Paris France

In this paper, an idea of using space-time block coding (STBC) in multi-user cooperative diversity has been exploited to improve the performance of the transmission in wireless local area networks. The theoretical and simulation results show that, using STBC approaches can always achieve the better performance than existing techniques without introducing the space-time coding. By analyzing the throughput and frame error ratio (FER) of the two different STBC cooperative schemes, we find the trade-off between throughput and reliability. The location of the relay is crucial to the performance, which supposes a rule for future cross-layer design.

关键词： multiple-input-multiple-output (MIMO) Cooperation Space-time Block Coding (STBC).

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Quad-band circularly polarized super-wideband MIMO antenna for wireless applications

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2022年第6期32卷 e23129-e23129页

作者： Kumar, Amit Saxena, Gaurav Kumar, Preetam Awasthi, Yogendra Kumar Jain, Priyanka Singhwal, Sumer Singh Ranjan, Prashant Bharati Vidyapeeth Deemed Univ Dept Elect & Amp Commun Engn Coll Engn Pune Maharashtra India Galgotia Coll Engn & Technol Dept Elect & Commun Engn Greater Noida 201306 UP India Indian Inst Technol Patna Dept Elect Engn Bihta Patna India Manav Rachna Int Inst Res & Studies Antenna Fabricat & Measurement Lab Elect & Commun Engn Faridabad HR India Delhi Technol Univ Dept Elect & Commun Engn Delhi India Politecn Torino Dept Elect & Telecommun Turin Italy Chandigarh Univ Dept Elect & Commun Engn Mohali Punjab India Univ Engn & Management Dept Elect & Commun Engn Jaipur Rajasthan India

In this article, a Super-wideband (2.6-22 GHz) two-elements multiple-input-multiple-output antenna (MIMO) is presented with a dimension of 49 x 54.5 x 1.6 mm(3) on an FR-4 substrate. The antenna is also exhibited dual circular polarization (RHCP and LHCP) simultaneously at two separate ports at four frequencies of 5.2, 11.5, 14.66, and 16.75 GHz, which are extensively utilized for WLAN, X, and Ku-band applications. Four EBG cells of various sizes have been installed across the feed line to maintain the antenna's efficiency and control the specific absorption rate (SAR). The antenna has a minimum isolation of 17 dB (20 dB for the important portion) in Super-wideband (SWB) and excellent diversity performance. Simulated results of antenna-like return loss, isolation, and diversity parameters have also been verified experimentally, which are in the acceptable range. Also, the calculated maximum SAR at 10 g is 1.095 W/kg with the head voxel model at 3.5 GHz.

关键词： left hand circularly polarized multiple-input-multiple-output right hand circularly polarized super-wideband

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