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Visible light communications: Fast-orthogonal frequency division multiplexing in highly bandlimited conditions

Anthony Haigh, P; Darwazeh, I; (2018) Visible light communications: Fast-orthogonal frequency division multiplexing in highly bandlimited conditions. In: Proceedings of the 2017 IEEE/CIC International Conference on Communications in China (ICCC Workshops). (pp. pp. 1-8). IEEE: Qingdao, China. Green open access

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Abstract

In this paper we propose, for the first time, fast orthogonal frequency division multiplexing (FOFDM) for visible light communications (VLC) systems. VLC systems often exhibit highly band-limited system responses and as such supporting high transmission speeds is a key challenge. FOFDM makes use of an inverse discrete cosine transform (IDCT) to generate the time domain symbols, as opposed to the inverse fast Fourier transform (IFFT) used in OFDM. This offers several advantages for VLC in particular, because sacrificing complex modulation formats in favour of real ones such as pulse-amplitude modulation (PAM) enables reduction of the subcarrier spacing to 1/2T, where T is the symbol period, whilst maintaining orthogonality. This results in a bandwidth saving of 50% in comparison to OFDM, whilst maintaining an equivalent spectral efficiency. Hence in this work, we examine the bit error rate performance of F-OFDM in comparison to conventional OFDM with an equal number of subcarriers and equivalent spectral efficiency for a number of band-limited conditions as a function of the energy-per-bit to noise spectral density ratio (Eb/N0). We demonstrate that due to the 50% bandwidth savings, F-OFDM outperforms OFDM in band-limited conditions, because the impact of the attenuation caused by the band-limitation on each subcarrier is reduced. Therefore, we show that FOFDM results in lower electrical power penalty relative to conventional OFDM for a given set of band-limitation conditions, while maintaining equivalent spectral efficiency.

Type: Proceedings paper
Title: Visible light communications: Fast-orthogonal frequency division multiplexing in highly bandlimited conditions
Event: 2017 IEEE/CIC International Conference on Communications in China (ICCC Workshops)
ISBN-13: 9781538664032
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ICCChinaW.2017.8355265
Publisher version: http://dx.doi.org/10.1109/ICCChinaW.2017.8355265
Language: English
Additional information: © 2017 IEEE. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Digital signal processing, modulation formats, optical communications, orthogonal frequency division multiplexing, visible light communications
UCL classification: 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/10059304
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