This article presents a novel online adaptive non-linear multiple-input-multiple-output neuro-fuzzy control scheme for flexible AC transmission systems. The proposed control system synergistically integrates the time-...
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This article presents a novel online adaptive non-linear multiple-input-multiple-output neuro-fuzzy control scheme for flexible AC transmission systems. The proposed control system synergistically integrates the time-frequency localization property of wavelets with locally controllable membership functions in the structure of neuro-fuzzy Takagi-Sugeno-Kang control. The proposed control scheme is checked for both multiple-input-single-output and multiple-input-multiple-output topologies. The performance of the proposed control system is validated against different contingencies and operating conditions using non-linear time-domain simulations and different performance indices. The results reveal that the proposed control scheme effectively damps the local and inter-area modes of oscillations.
This paper presents the design and development of a dual-band and dual-polarized two-port multiple-input-multiple-output (MIMO) antenna for mid-band 5G (3.4-3.6 GHz), and C-band (4-8 GHz) applications. The antenna des...
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This paper presents the design and development of a dual-band and dual-polarized two-port multiple-input-multiple-output (MIMO) antenna for mid-band 5G (3.4-3.6 GHz), and C-band (4-8 GHz) applications. The antenna design is very simple and it mainly consists of a circular-shaped single split-ring resonator on the top side of the substrate which is coupled with the microstrip line feed line. The bottom side is comprised of a rectangular-shaped defected ground structure. Due to this dual-band response is obtained and the first band shows linear polarization and the second band provides circular polarization. The entire dimensions of the intended two-port MIMO antenna are 46 mm x 21 mm x 1.6 mm. The antenna measured results offer a wider impedance bandwidth (IBW) of 20.22% and 44.07% for the two bands centered at 3.54 GHz and 6.33 GHz respectively. Also, the proposed MIMO antenna shows minimum isolation of 15 dB for the two frequency bands with a smaller edge-to-edge spacing of 4 mm (0.04 lambda(0)) between the two antenna elements. Moreover, the second band provides an axial ratio bandwidth of 3.97% centered at 6.78 GHz. The antenna shows excellent IBW, good isolation between the single antenna elements without the use of any decoupling mechanism, better antenna gain, and improved envelope correlation coefficient by maintaining smaller antenna size compared to similar types of existing two-port MIMO antennas in literature. (C) 2020 Elsevier GmbH. All rights reserved.
We consider precoder optimization for authentication in a wireless multiple-input-multiple-output (MIMO) system that embeds a fingerprint at the physical layer. The optimization relaxes the assumptions that the same p...
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ISBN:
(纸本)9781538671177
We consider precoder optimization for authentication in a wireless multiple-input-multiple-output (MIMO) system that embeds a fingerprint at the physical layer. The optimization relaxes the assumptions that the same precoding matrix will be used for both data and tag and that the intended receiver (Bob) is able to perfectly estimate the data. The sum mean-square error (MSE) estimate of the tag is derived as a function of data and tag precoder matrices, which is then minimized under individual data and tag power constraints. Simulation results show that the proposed precoder optimization provides much better authentication probability than the equal power allocation. Moreover, by tuning the tag power, the desired tradeoff between authentication probability and key leakage (as measured by key equivocation at an eavesdropper) can be achieved with the proposed method.
In this paper we make nonparametric measurements on a system with two inputs and two outputs, in the presence of nonlinear distortions. Starting from a series of experiments, the frequency response function, the covar...
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ISBN:
(纸本)9781424428335
In this paper we make nonparametric measurements on a system with two inputs and two outputs, in the presence of nonlinear distortions. Starting from a series of experiments, the frequency response function, the covariance matrix of the output noise, and the covariance matrix of the output nonlinear distortions are estimated as a function of the frequency. It will be shown that, using well designed periodic excitations signals, it is possible to obtain these results with little user interaction, making the method accessible for non-experienced users.
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