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Asymmetrically Clipped-FSK Modulation for Energy Efficient Visible Light Communications

Abstract : In this article, we present proof-of-concept of Mary asymmetrically clipped (AC)-frequency-shift keying (FSK) for energy-efficient/low data rate visible light communications (VLC). M-ary AC-FSK uses the odd frequency waveforms from 2M-ary FSK; which exhibit half-wave symmetry. Owing to this half-wave symmetry, the negative amplitude excursions are clipped without loss of information. Hereby, we investigate the performance of three different receivers for M-ary AC-FSK exhibiting different complexities. These receivers are: (i) an optimal time-domain maximum likelihood (ML) receiver; (ii) 1tap discrete cosine transform (DCT) receiver; and (iii) a 2-tap harmonic receiver which exploits the spectral properties of AC-FSK waveforms. We shall exemplify that the 2-tap harmonic receiver overcomes the energy efficiency versus complexity trade-off that exists for optimal ML and 1-tap DCT receivers. Simulation results shall confirm that the performance of 2-tap harmonic receiver reaches the performance of the previously proposed unipolar (U)-FSK with the optimal receiver, but with a drastically reduced receiver complexity.
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Contributor : Laurent Ros Connect in order to contact the contributor
Submitted on : Thursday, October 7, 2021 - 11:33:52 AM
Last modification on : Monday, February 14, 2022 - 4:50:01 PM
Long-term archiving on: : Saturday, January 8, 2022 - 6:39:46 PM


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M. J. Khan, Ali Waqar Azim, Yannis Le Guennec, Ghislaine Maury, Laurent Ros. Asymmetrically Clipped-FSK Modulation for Energy Efficient Visible Light Communications. PIMRC 2021 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2021), Sep 2021, Oulu (Virtual conference), Finland. pp.458-464, ⟨10.1109/PIMRC50174.2021.9569645⟩. ⟨hal-03369258⟩



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