We experimentally demonstrate a 2 x 2 optical multiple-inputs multiple-outputs (MIMO) visible light communications system based on the modified orthogonal frequency-division multiplexing/offset quadrature amplitude mo...
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We experimentally demonstrate a 2 x 2 optical multiple-inputs multiple-outputs (MIMO) visible light communications system based on the modified orthogonal frequency-division multiplexing/offset quadrature amplitude modulation scheme. The adjacent subcarrier frequency-domain averaging (ASFA) with the full-loaded (FL) and half-loaded (HL) preamble structures is proposed for demultiplexing and mitigating the intrinsic imaginary interference (IMI) effect. Compared with the conventional channel estimation (CE) method, ASFA offers improved transmission performance. With the FL method, we obtain more accurate MIMO CE to mitigate the IMI effect and the optical noise compared to the HL method. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Frequency Response Matrix (FRM) estimation from measured data is an important step towards the control of complex systems, including motion and thermal systems. Missing samples in the measured data records, e.g., due ...
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Frequency Response Matrix (FRM) estimation from measured data is an important step towards the control of complex systems, including motion and thermal systems. Missing samples in the measured data records, e.g., due to sensor failure or faulty data transmission, often occur. In this paper, a method is presented for the nonparametric FRM identification of multiple-inputs multiple-outputs (MIMO) systems from incomplete and noisy data records. The method exploits time- and frequency-domain localizing wavelets to accurately estimate the FRM and its covariance from the time-frequency plane. Good performance is demonstrated in a simulation study.
In this paper, a model of input and output characteristics of the tip position of a 3-DOF micro-hand is proposed. The micro-hand is made up of three artificial muscles and the contraction force generated in each artif...
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ISBN:
(纸本)9781728165301
In this paper, a model of input and output characteristics of the tip position of a 3-DOF micro-hand is proposed. The micro-hand is made up of three artificial muscles and the contraction force generated in each artificial muscle bends it. Therefore, the proposed model is considered a force dynamics relationship. First, this micro-hand will be described. Next, the derivation of the proposed model is explained. In addition, the simulation results from the proposed model are compared with the experimental results.
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