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Real Time Implementation of CAP Modulation with 'Better-Than-Nyquist' Pulse Shaping in Visible Light Communications

Lookup NU author(s): Dr Paul Haigh

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Abstract

© 1997-2012 IEEE.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.


Publication metadata

Author(s): Haigh PA, Darwazeh I

Publication type: Article

Publication status: Published

Journal: IEEE Communications Letters

Year: 2020

Volume: 24

Issue: 4

Pages: 840-843

Print publication date: 01/04/2020

Online publication date: 17/01/2020

Acceptance date: 13/01/2020

ISSN (print): 1089-7798

ISSN (electronic): 1558-2558

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/LCOMM.2020.2967043

DOI: 10.1109/LCOMM.2020.2967043


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