Demonstration of an Adaptive Fractionally-Spaced Pre-Equaliser to Increase VLC System Data Rates

Xicong Li, Zabih Ghassemlooy, Stanislav Zvanovec, Hoa Le-Minh, Richard Binns, Ambrose Eromosele, Geoff Archenhold

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper demonstrates a VLC system using an adaptive fractionally-spaced pre-equaliser to extend the modulation bandwidth of the light-emitting diodes (LEDs). The proposed system has the flexibility of compensating for different LEDs by reloading the digital adaptive equaliser’s coefficients without introducing any modification to the hardware. The key enabling power to obtain the optimal equaliser coefficients is from the well-known least mean square (LMS) algorithm. As a by-product, the proposed method offers a novel angle and a method to determine the pre-equaliser coefficients for those systems which do not have the updating algorithm implemented in a real-time manner but have to rely on a stored pre-set coefficient list. Finally, the experimental validation clearly shows the effectiveness of the proposed scheme by means of the improvement in the received eye diagrams.
Original languageEnglish
Title of host publication2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDS)
Place of PublicationPiscataway, US
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665410441
ISBN (Print)9781665410458
Publication statusPublished - 20 Jul 2022

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