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Real Time Implementation of CAP Modulation With “Better-Than-Nyquist” Pulse Shaping in Visible Light Communications

Haigh, PA; Darwazeh, I; (2020) Real Time Implementation of CAP Modulation With “Better-Than-Nyquist” Pulse Shaping in Visible Light Communications. IEEE Communications Letters , 24 (4) pp. 840-843. 10.1109/lcomm.2020.2967043. Green open access

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Abstract

In this letter we experimentally verify a real-time implementation of the ‘better-than-Nyquist’ pulse shape in carrier-less amplitude and phase (CAP) modulation in the context of a visible light communications system. We use two National Instruments universal software radio peripherals (USRPs) as a transmitter and receiver working independently. Previously reported experimental work on pulse shaping in CAP is also verified in real time, showing lower error vector magnitudes (EVM) can be obtained at shorter filter lengths using the better-than-Nyquist pulses in place of the conventionally used square-root raised cosine as the basis function of the signal. We show that a real time EVM penalty is an additional 3% EVM in the worst case and is a result of synchronisation offset at the receiver.

Type: Article
Title: Real Time Implementation of CAP Modulation With “Better-Than-Nyquist” Pulse Shaping in Visible Light Communications
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/lcomm.2020.2967043
Publisher version: http://doi.org/10.1109/lcomm.2020.2967043
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: OFDM , Light emitting diodes , Real-time systems , Visible light communication , Quadrature amplitude modulation , Pulse shaping methods
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10095166
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