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IEEE 4th International Symposium on Joint Communications and Sensing (JC and S)

作者： Kamal, Shahanawaz Adler, Jan Matthe, Maximilian Sen, Padmanava Barkhausen Inst D-01067 Dresden Germany

ISBN: (纸本)9798350385458;9798350385441

This paper introduces a dual-element multiple-input multiple-output (MIMO) microstrip antenna for device to-device (D2D) integrated sensing and communications (ISAC) applications in the Wi-Fi 6 GHz spectrum. Each radiating element was equipped with a feeding port on one of its ends that was connected to a quarter-wavelength (0.25A) line for impedance matching. The 0.25A line was subsequently coupled to a crescent axed sporadic meander trace for attaining circular polarization (CP) and antenna miniaturization. In particular, axial ratio (AR) of <3 dB was realized in a compact area of 5.3 cm x 53 cm that is 1.1 lambda x 1.1 lambda at the center frequency (f(center)) of 6.33 GHz. A rectangular microstrip was integrated between the two radiating elements, and at the same time, along the edge of the dielectric substrate to render a parasitic resonance that ultimately contributed in producing the omnidirectional circularly polarized (OCP) electromagnetic (EM) waves. Furthermore, a decoupling architecture composed of multiple shorting pins that extended from the parasitic element to the defected ground was introduced for accomplishing a high average isolation of >20 dB. Flame resistant (FR-4), an inexpensive dielectric substrate with low profile of 0.03A was used to yield a wide impedance bandwidth (I-BW) ranging from 4.42 GHz 8.24 GHz. The simulated computations, and the measurement results procured within the anechoic chamber confirmed substantial agreement. Moreover, lab experiments proved the suitability of the manufactured antenna for communications applications. In contrast with contemporary antennas, the proposed antenna occupied small area and low-profile to exhibit a wide axial ratio bandwidth (AR-BW) that combines with reasonable performance in terms of I-BW and average isolation.

关键词： Antenna circular polarization isolation integrated sensing and communications low-profile miniature multiple-input-multiple-output omnidirectional wideband

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Dual-Band and Dual-Polarization CPW Fed MIMO Antenna for Fifth-Generation Mobile Communications Technology at 28 and 38 GHz

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IEEE ACCESS 2022年 10卷 46853-46863页

作者： Tsao, Yi-Fan Desai, Arpan Hsu, Heng-Tung Natl Yang Ming Chiao Tung Univ Int Coll Semicond Technol Hsinchu 300093 Taiwan Charotar Univ Sci & Technol CHARUSAT Dept Elect & Commun Engn CSPIT Changa 388421 India Natl Yang Ming Chiao Tung Univ Ind Acad Innovat Sch Hsinchu 300093 Taiwan

In this paper, we developed a 2-port dual-band and dual-polarization multiple-input- multiple-output (MIMO) antenna for fifth-generation (5G) mobile applications at 28 and 38 GHz. The antenna was fabricated using a double-layer Rogers TM R04003 substrate with a footprint of 3.77 lambda(0) x 1.86 lambda(0) (lambda(0) being the free-space wavelength at 28 GHz). The aperture-coupled patch configuration fed by a coplanar waveguide (CPW) transmission line is adopted as the elementary antenna. The top patch and the coupling aperture are designed to radiate at 38 GHz and 28 GHz respectively for dual-band operation. Further enhancement of the directivity at 28 GHz is achieved through the top patch acting as a parasitic director. A 2-by-4 array antenna for MIMO application was then constructed through physical rotation of the single element at +45 and -45 degrees to create polarization diversities. The 2-port MIMO antenna realized using this configuration demonstrated an impedance bandwidth of S11<-10 dB covering 27.6-30.3 GHz and 33.4-40.4 GHz, a gain of greater than 8 dBi, isolation of more than 20 dB and a cross-polarization level of greater than 20 dB. The important MIMO parameters such as ECC, DG, TARC, and MEG have also been characterized and presented.

关键词： Antenna array dual-band antenna dual-polarization 5G multiple-input-multiple-output millimeter-wave

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Constant Weight Polar Coded Orthogonal Space-Time Block Codes for Dimmable Indoor MIMO-VLC Systems

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IEEE COMMUNICATIONS LETTERS 2022年第10期26卷 2395-2399页

作者： Babalola, O. P. Balyan, V Cape Peninsula Univ Technol Dept Elect Elect & Comp Engn ZA-7535 Bellville South Africa

The concatenation of constant weight polar code (CWPC) with orthogonal space-time block code (OSTBC), known as CWPC-OSTBC scheme is proposed for the indoor multiple-input multiple output visible light communication (MIMO-VLC) systems in this letter. The CWPC helps to mitigate against flickering, provides desired dimming targets, and coding gain while the OSTBC achieves MIMO diversity gain. Flicker mitigation and dimming control are obtained based on the modified Knuth balancing method with enhanced prefix coding. This method does not utilise lookup table and thus, it is practicable in the real-time. Numerical results are presented to discuss the channel capacity and bit-error-rate (BER) performance of the proposed CWPC-OSTBC scheme considering different parameters. The results show that increasing the transmission antennas of the OSTBC system provides diversity gains. More so, the CWPC-OSTBC scheme yields an improved coding gain compared to polar code without balancing and other state-of-the-art methods.

关键词： Decoding Encoding Polar codes Codes Light emitting diodes Symbols Reliability Constant weight polar code multiple-input-multiple-output orthogonal space-time block code visible light communication

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8-Port Quad-band MIMO Antenna with an Isolation Enhancement Technique for Sub-6 GHz 5G Applications 17

8-Port Quad-band MIMO Antenna with an Isolation Enhancement ...

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17th European Conference on Antennas and Propagation (EuCAP)

作者： Alam, Tanjir Cheffena, Michael Rajo-Iglesias, Eva Norwegian Univ Sci & Technol NTNU Fac Engn N-2815 Gjovik Norway Univ Carlos III Madrid Dept Signal Theory & Commun Madrid 28911 Spain

ISBN: (纸本)9788831299077

In this paper, an eight-port quad-band multiple-input-multiple-output (MIMO) antenna system with an isolation enhancement technique is presented. The proposed isolation technique is used to improve the isolation between the ports with higher mutual coupling. This technique can also be repeatedly applied between other ports to improve the isolation without affecting the impedance bandwidth and other transmission coefficients. Each radiating element of the proposed system is excited using an offset-fed coaxial port. The multiple radiating elements are placed in a double-folded symmetry fashion to reduce the number of different parameters in the global S-parameter matrix. The designed quad-band 8-port MIMO antenna system is printed on Rogers RO4350B (epsilon(r)=3.55, tan delta=0.004) substrate with dimensions of 120x70x1.52 mm(3). The proposed MIMO antenna system's frequency bands lie in 5G n77, n78, n79, and n46 sub-6 GHz bands. The simulated and measured parameters are in good agreement.

关键词： 5G 8-port isolation multi-band multiple-input-multiple-output MIMO multi-port sub-6 GHz

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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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All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial multiplexing

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IEEE ACCESS 2022年 10卷 102646-102658页

作者： Kouhini, Sepideh Mohammadi Hohmann, Julian Mana, Sreelal Mavanchery Hellwig, Peter Schulz, Dominic Paraskevopoulos, Anagnostis Freund, Ronald Jungnickel, Volker Fraunhofer Heinrich Hertz Inst Photon Networks & Syst D-10587 Berlin Germany

LiFi or networked optical wireless communication is likely to play an important role in offloading mobile data traffic from radio into the optical spectrum. As the number of Internet of Things (IoT) devices is growing, the RF spectrum becomes a rare resource. Imaging IoT sensors like cameras, ultrasonic devices, and Lidars have real-time requirements, need a high-capacity uplink, and operate in environments that cause or are sensitive against electromagnetic interference. In this paper, for the first time, we present realtime communication over an all-optical fixed-wireless LiFi link based on the distributed multiple-input multiple-output concept. For distributing the wireless signals, plastic optical fibers are used as an analog front-haul. We study the operation of the distributed multiple-input multiple-output link in two modes, i.e., spatial diversity and spatial multiplexing. For the diversity mode, a new combiner is presented, which can support equal gain as well as selection combining. We demonstrate that selection combining is highly effective and enables a similar LiFi performance in up- and downlink, as it is desirable for industrial applications. For the spatial multiplexing mode, we observe that the channel rank and the achievable throughput depend strongly on the user location. As effective solutions, we study the benefits of angular diversity and multiple-input multiple-output mode switching together with multi-user multiplexing and conclude that a dynamic switching between spatial diversity and spatial multiplexing is a practical approach.

关键词： Light fidelity Optical fibers MIMO communication Optical transmitters Optical fiber communication Diversity reception Optical fiber networks Optical wireless communication plastic optical fiber multi-user multiple-input-multiple-output diversity spatial multiplexing

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Enhancement of isolation between two closely spaced patch antennas using inter-digital capacitor and short-circuited stub-based band pass decoupling network

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JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 2022年第5期36卷 669-681页

作者： Mondal, Payel Dhara, Debapratim Harish, A. R. IIT Kanpur Dept Elect Engn Kanpur Uttar Pradesh India

A novel decoupling network consisting of inter-digital capacitors and a short-circuited stub to improve the isolation of two closely spaced (edge-to-edge separation is 0.013 lambda(0), where lambda(0) is the resonating frequency) patch antennas is investigated. Before and after the implementation of the proposed decoupling network (DN), the effect on the isolation is explored and the final decoupled structure shows a high isolation of 40 dB at 4.83 GHz. As the proposed structure can provide a good input impedance match after connecting the decoupling network in the system, there is no requirement of additional matching circuitry.

关键词： multiple-input-multiple-output short-circuited stub inter-digital capacitor decoupling network

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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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Integration of Sub-6 GHz and mm-Wave Antenna for Higher-Order 5G-MIMO System

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2022年第12期69卷 4834-4838页

作者： Saurabh, Arun Kumar Meshram, Manoj Kumar BHU Varanasi Dept Elect Engn Indian Inst Technol Varanasi 221005 Uttar Pradesh India

An extremely low-profile/compact MIMO system is proposed by utilizing the dual antenna for 5G sub-6 GHz and mm-wave application. The antennas are integrated on a centrally located square-shaped slot-loaded octagon-shaped substrate board area of 3706.69 mm(2). The identical dual antenna elements with the same orientation are orthogonally placed on an octagon-shaped substrate from the outer side, creating an 8-element MIMO antenna for sub-6 GHz application. From the inner side of the same substrate, a 1x4 array-based antenna is orthogonally placed in front of the remaining side of the octagon, forming a 4-element MIMO antenna for mmwave application. The edge-to-edge separation between element-1 and -9 is almost close to lambda(0)/64 (lambda(0) at 4.0 GHz). The stubs are connected to shared ground plane to reduce the coupling between closely placed antenna elements. The MIMO system provides dual -6 dB impedance bandwidth of (S-ij is an element of i = j, 1 to 8) 4.0-5.6 GHz and (S-ij is an element of i = j, 9 to 12) 24.25-29.5 GHz, can cover the 5G n79//n257/n258 bands. It has a minimum isolation (S-ij is an element of i not equal j) value of 12 dB and 22 dB, respectively. Also, the peak gain and total efficiency values for element-1 and -9 are 5.4 dBi and 8 dBi, and 56.5-77.4% and 70.3-96.2%, respectively. The measured and simulated results are found in close agreement those confirming that the proposed MIMO system may be a suitable candidate for 5G-smartphones. Due to 0.508 mm low-profile, antenna is integrated within the back cover of smartphones, thereby inside device volume will reduce.

关键词： Correlation millimeter-wave multiple-input-multiple-output mutual coupling wideband 5G new radio

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Wideband 20-Elements 3D-MIMO Antenna for Localization System

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2022年第2期69卷 409-413页

作者： Saurabh, Arun Kumar Meshram, Manoj Kumar Indian Inst Technol BHU Dept Elect Engn Varanasi 221005 Uttar Pradesh India

In this brief, a low-profile wideband quad-element MIMO antenna with high isolation is designed, which is utilized to propose a 20-elements MIMO system. Each element of the MIMO antenna covers a wideband occupying a small area of 15x15 mm(2). The orthogonal symmetric arrangement of a single antenna forms an extremely compact quad-element MIMO antenna having shared ground, and its occupied volume is 0.84 lambda(g)x0.84 lambda(g)x0.019 lambda(g) (lambda(g) at 3.95 GHz) with a minimum (0.155 lambda(g)) edge to edge distance between elements. The proposed antenna has a -10 dB (S-ij is an element of i = j) impedance bandwidth of 77.52% (3.95-8.95 GHz) and a minimum isolation (S-ij is an element of i not equal j) value of 17 dB. The measured and simulated results are found in good agreement that confirms the proposed antenna is appropriate for extending a higher-order MIMO system. Further, a low-profile quad-element MIMO antennas are arranged orthogonally at the four-corners and a quad-element MIMO antenna at the center of form a 20-elements planar MIMO antenna. It can be utilized as a localization system where different user's devices are connected to the primary host.

关键词： Correlation isolation multiple-input-multiple-output mutual coupling wideband

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