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Phase and Channel Estimation for High-Capacity Phase-Asynchronous Mode-Division multiplexing multiple-input multiple-output Free-Space Optical Communications in Strong Turbulent Channels

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2024年第11期42卷 4132-4143页

作者： Li, Yiming Chen, Zhaozhong Patel, Mohammed Lavery, Martin P. J. Ellis, Andrew D. Aston Univ Aston Inst Photon Technol Birmingham B4 7ET England Univ Glasgow James Watt Sch Engn Glasgow G12 8QQ Scotland

In this paper, we propose a novel pilot-aided phase and channel estimation algorithm for coherent mode-division multiplexing multiple-input multiple-output free-space optical communication system. This algorithm enables the implementation of advanced multiple-input multiple-output decoders, leading to a significantly better bit error rate performance. This algorithm also supports phase-asynchronous light sources at each transmit and receive channel, significantly reducing the hardware requirements. Moreover, it has low computational complexity and Cram & eacute;r-Rao lower bound approaching estimation performance. In our proof-of-concept experiment, we employed 10 decorrelated channels to achieve a record-high 689.2 Gbit/s/wavelength line rate in strong turbulence, verifying the feasibility of our phase and channel estimation algorithm.

关键词： Channel estimation Estimation MIMO communication Phase noise Symbols Decoding Vectors Atmospheric turbulence channel estimation free-space optics multiple-input multiple-output

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An adaptive control algorithm for harmonic cancellation in multiple-input multiple-output vibration systems

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JOURNAL OF VIBRATION AND CONTROL 2024年第17-18期30卷 3837-3849页

作者： Xu, Zhenyu Li, Chao Chen, Zhangwei Zhejiang Univ State Key Lab Fluid Power & Mech Syst Hangzhou Peoples R China Zhejiang Univ State Key Lab Fluid Power & Mech Syst Yuhangtang Rd 866 Hangzhou 310058 Peoples R China

This paper presents a time-domain adaptive algorithm designed to eliminate harmonics in a multiple-input multiple-output (MIMO) system, taking into account its coupling characteristics. The algorithm is an improvement over the X-filtered LMS (FxLMS) algorithm, and is specifically tailored to the triaxial vibration system. The proposed algorithm has been shown to achieve high convergence, even in the presence of identification errors, as confirmed through both theoretical derivation and numerical simulations. To validate the efficacy of the proposed MIMO harmonic cancellation algorithm, it was tested on a genuine triaxial vibration system. The experimental results clearly demonstrate that the algorithm effectively reduces the output harmonic disturbance of the three axes' frequency components.

关键词： Triaxial vibrator harmonic cancellation adaptive control FxLMS algorithm multiple-input multiple-output

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Novel Movement-Based Methods for the Calibration of Colocated multiple-input multiple-output Radars

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IEEE ACCESS 2023年 11卷 116090-116108页

作者： Guerzoni, Giorgio Faghand, Elahe Vitetta, Giorgio Matteo Vincenzi, Loris Mehrshahi, Esfandiar Univ Modena & Reggio Emilia Dept Engn Enzo Ferrari I-41124 Modena Italy Shahid Beheshti Univ Fac Elect Engn Dept Telecommun Tehran *** Iran

It is well-known that the availability of transmit and receive arrays in colocated multiple-input multiple-output radar systems can be exploited to detect multiple targets, and estimate their range and angular coordinates. Unluckily, the accuracy achieved in the estimation of target parameters can be severely affected by hardware nonidealities. The impact of these nonidealities can be mitigated through the adoption of specific methods explicitly developed to estimate and compensate for them, i.e., briefly, of calibration methods. As far as we know, until now, most of the calibration techniques proposed in the technical literature for colocated multiple-input multiple-output radars are based on the idea of placing one or more reference targets in front of the considered radar device at perfectly known and fixed locations, and quantifying the difference between the expected radar image and the measured one. In this manuscript, two novel calibration methods are proposed. Both exploit the measurements captured by a colocated multiple-input multiple-output radar device at multiple positions;for this reason, the acquisition of such measurements involves the movement of the radar. The first one does not require any knowledge about the nature, number, position or radar cross section of the reference targets, provided that all these are in far-field;the second one, instead, needs a single reference target in near-field conditions, with the only constraints for it to be pointwise and isolated from stray targets in the range domain. This drastically simplifies the experimental setup to be employed for radar calibration. The proposed methods are tested on a commercial radar device and compared with a traditional method for radar calibration.

关键词： Calibration multiple-input multiple-output radar synthetic aperture radar

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Examination of the multiple-input multiple-output space-time block-code selective decode and forward relaying protocol over non-homogeneous fading channel conditions

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JOURNAL OF DEFENSE MODELING AND SIMULATION-APPLICATIONS METHODOLOGY TECHNOLOGY-JDMS 2023年第2期20卷 245-258页

作者： Shankar, Ravi Krishna, Patteti Naraiah, R. Madanapalle Inst Technol & Sci Post Box 14 Madanapalle 517325 Andhra Pradesh India Netaji Subhas Univ Technol ECE Dept Ambedkar Inst Adv Commun Technol & Res AIACTR Govt NCT Delhi East Campus New Delhi 110031 India Narasaraopeta Engn Coll ECE Dept Narasaraopet 522601 Andhra Pradesh India

With the tremendous increase in wireless user traffic, investigation on the end-to-end reliability of wireless networks in practical conditions such as non-homogeneous fading channel conditions is becoming increasingly widespread. Because they fit well to the experimental data, generalized channel fading distributions like kappa-mu, are well suited for modeling diverse fading channels. This paper analyzes the symbol error rate (SER) and outage probability (OP) performance of multiple-input multiple-output (MIMO) space-time block-code (STBC) selective decode and forward (S-DF) network over kappa-mu, fading channel conditions considering the additive white Gaussian noise (AWGN). First, the closed-form (CF) analytical expressions for the probability density function (PDF) and the cumulative distribution function (CDF) of the received signal-to-noise ratio (SNR) as well as its moment generating function (MGF) are derived. Second, the OP performance is then investigated for various values of the channel fading parameter and SNR regimes. The simulation findings show an increase in SER performance with an improved line-of-sight (LOS) component. Furthermore, the results show that the S-DF relaying systems can function properly even when there is no fading or LOS component. The OP has been increasing with the increase in the value of mu and kappa. In medium and high SNR regimes, simulation results exactly match with analytical results.

关键词： multiple-input multiple-output selective decode and forward symbol error rate kappa-mu fading signal-to-noise ratio cumu- lative distribution function probability density function line-of-sight

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Identification Over Compound multiple-input multiple-output Broadcast Channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2023年第7期69卷 4178-4195页

作者： Rosenberger, Johannes Pereg, Uzi Deppe, Christian Tech Univ Munich Chair Commun Engn Dept Comp Engn Sch Computat Informat & Technol D-80333 Munich Germany Tech Univ Munich Inst Commun Engn D-80333 Munich Germany Munich Ctr Quantum Sci & Technol MCQST D-80799 Munich Germany Technion Israel Inst Technol Fac Elect & Comp Engn IL-3200003 Haifa Israel Technion Israel Inst Technol Technion Hellen Diller Quantum Ctr IL-3200003 Haifa Israel

The identification capacity region of the compound broadcast channel is determined under an average error criterion, where the sender has no channel state information. We give single-letter identification capacity formulas for discrete channels and multiple-input multiple-output Gaussian channels under an average input constraint. The capacity theorems apply to general discrete memoryless broadcast channels. This is in contrast to the transmission setting, where the capacity is only known for special cases, notably the degraded broadcast channel and the multipleinput multiple-output broadcast channel with private messages. Furthermore, the identification capacity region of the compound multiple-input multiple-output broadcast channel can be larger than the transmission capacity region. This is a departure from the single-user behavior of identification, since the identification capacity of a single-user channel equals the transmission capacity.

关键词： Identification capacity compound channels broadcast communication multiple-input multiple-output

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Inverse Design of multiple-input multiple-output Perfectly-Matched Metamaterials

Inverse Design of Multiple-Input Multiple-Output Perfectly-M...

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International Applied-Computational-Electromagnetics-Society Symposium (ACES)

作者： Thakkar, Shrey Ruiz-Garcia, Jorge Szymanski, Luke Gok, Gurkan Grbic, Anthony Univ Michigan Dept Elect Engn & Comp Sci Ann Arbor MI 48109 USA MIT Lincoln Lab Lexington MA USA RTX Technol Res Ctr East Hartford CT USA

ISBN: (纸本)9781733509671;9798350362978

Inverse design has been applied to a variety of complex electromagnetic structures including multifunctional and multiple-input multiple-output (MIMO) devices, where analytical design methods are limiting. We have previously reported on the inverse design of single-input, single-output Perfectly-Matched Metamaterials (PMMs). PMMs are inhomogeneous, anisotropic 2D metamaterials composed of unit cells that remain impedance-matched to each other and the surroundings under all excitations. PMMs rely primarily on refractive effects and exhibit broadband operation. This work presents the inverse design of a compact MIMO device based on PMMs: a 2D beamformer with prescribed amplitude and phase profiles that exhibits zero scan loss.

关键词： Beamforming metamaterials multiple-input multiple-output inverse design

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Throughput Performance of Wireless multiple-input multiple-output Systems Using OAM Antennas

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IEEE WIRELESS COMMUNICATIONS LETTERS 2021年第2期10卷 261-265页

作者： Lei, Yi Yang, Yang Wang, Yanzhe Guo, Kai Gong, Yubin Guo, Zhongyi Hefei Univ Technol Sch Comp & Informat Hefei 230009 Peoples R China Univ Elect Sci & Technol China Natl Key Lab Vacuum Elect Chengdu 610054 Peoples R China

This letter experimentally demonstrated the performance improvement of orbital-angular-momentum (OAM) based 2 x 2 MIMO communication by using the diversity of different OAM modes. The OAM antenna we used is an eight-arm Archimedean spiral antenna (ASA) capable of generating multiple high-quality OAM vortex waves individually or two types of two-mode mixed vortex waves simultaneously. Both of the two cases are investigated for MIMO communication by evaluating the throughput performance. For MIMO with two OAM modes (generated by two ASAs separately), the throughput improves upon traditional MIMO by up to 30.50%, while for MIMO with two-mode mixed vortex waves (generated by one ASA), 6.59% throughput improvement is obtained.

关键词： MIMO communication Wireless communication Receiving antennas Throughput Spirals Wireless fidelity Orbital angular momentum archimedean spiral antenna multiple-input multiple-output wireless communications

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Hybrid optimization-based deep neuro-fuzzy network for designing m-user multiple-input multiple-output interference channel

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2023年第17期36卷 e5606-e5606页

作者： Reddy, Gondhi Navabharat Kumar, C. V. Ravi Vellore Inst Technol Sch Elect Engn SENSE Embedded Technol Vellore 632014 India

multiple-input multiple-outputs (MIMOs) have eminent quality in maximizing the throughput of wireless communication models. In MIMO, the antenna arrays can be utilized for fulfilling the needs of 5G by utilizing various spatial signatures of users. Even though 5G communication is imminent, there exist issues, like network interference that arise due to reused frequency spectrum resources. This delving presents an optimized deep model for suppressing interference occurring in the Rayleigh channel in the multiple-user MIMO (MU-MIMO) model. Here, an MU-MIMO model is employed with correlated interference wherein there exist various users around the base station (BS) with several antennas at the transmitter and receiver. Here, a deep neuro-fuzzy network (DNFN) is used to upgrade the performance of detectors underneath correlated interference. Here, the model comprises zero forcing-maximum likelihood detection (ZF-MLD) that assists to generate an initial estimate of broadcasted signals in a particular time slot. The DNFN is used to capture latent correlation among several symbols. Here, the DNFN training is performed using developed autoregressive Henry gas spider monkey optimization (RHGSMO), which is the combination of conditional autoregressive value at risk (CAViaR), Henry gas solubility optimization (HGSO), and spider monkey optimization (SMO). With the lowest symbol error rate (SER), bit error rate (BER), and signal to interference and noise ratio (SINR), the suggested RHGSMO-based DNFN performed better than existing approaches.

关键词： deep neuro-fuzzy network interference channel multiple-input multiple-output signal detection wireless communication

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Impact Load Compensation Inverter Based on Nonlinear Adaptive multiple input multiple output Control Strategy

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APPLIED SCIENCES-BASEL 2025年第6期15卷 3167-3167页

作者： Wang, Shuai Zhao, Ke Duan, Jiandong Sun, Li Harbin Inst Technol Sch Elect Engn & Automat Harbin 150001 Peoples R China

A nonlinear adaptive multiple-input multiple-output (NAMIMO) controller is designed to control a super capacitor compensation inverter. The proposed controller effectively suppresses the effects of impact loads from natural gas generation systems. In this paper, the transient current model of the compensation system is transformed into the power model using transient power theory, and then a direct power control algorithm with a vector control strategy is designed based on the whole power model. The proposed strategy can not only effectively suppress the impact of impact loads on the system but also maintain the stability of the microgrid to a certain extent. Meanwhile, the PLL control structure is replaced by an adaptive algorithm, which not only solves the system instability problem but also improves the dynamic response of the compensation system. In addition, the functional advantages, the frequency is bounded and stable throughout the whole process, and this differential frequency modulation allows the compensation system to exit the compensation smoothly. Finally, the simulation and experimental results on a 600 kW natural gas generator demonstrate that the proposed compensation strategy and control algorithm can effectively suppress the impact load effects.

关键词： multiple-input multiple-output super capacitor impact load natural gas generator inverter

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Coplanar waveguide fed ultra-wideband multiple-input multiple-output slot antenna with connected ground and high isolation for internet of things and wireless body area network applications

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2022年第12期32卷 e23549-e23549页

作者： Du, Chengzhu Wang, Ruohui Zhang, Jie Shanghai Univ Elect Power Coll Elect & Informat Engn Shanghai Peoples R China

This paper proposes two flexible ultra-wideband (UWB) multiple-input multiple-output (MIMO) slot antennas with connected ground and high isolation. Two MIMO antennas consist of two parallel slot antenna elements with coplanar waveguide feeds and ground. The antennas are etched on the liquid crystal polymer substrate and have the consistent sizes of 30 x 56 x 0.1 mm(3). The first UWB-MIMO antenna can cover 3-13 GHz. By adding a U-shaped slot on the first antenna, a second UWB-MIMO antenna with a notch-band is designed, which can work in 3.2-13 GHz and filter the wireless fidelity frequency band (5-6 GHz). High isolation better than 20 dB is obtained by adding fence-shaped branches. In addition, the performance of the flexible MIMO antenna is analyzed, including diversity performance parameters such as envelope correlation coefficient, diversity gain, gain, and total active reflection coefficient. The proposed UWB-MIMO antenna can be applied in internet of things and wireless body area network frequency bands.

关键词： band-notched coplanar waveguide flexible antenna internet of things liquid crystal polymer multiple-input multiple-output

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