Wireless visible light communications employing feed-forward pre-equalization and PAM-4 modulation

X. Li; N. Bamiedakis; X. Guo; J. J. D. McKendry; E. Xie; R. Ferreira; E. Gu; M. D. Dawson; R. V. Penty; I. H. White

doi:10.1109/JLT.2016.2520503

Wireless visible light communications employing feed-forward pre-equalization and PAM-4 modulation

X. Li, N. Bamiedakis, X. Guo, J. J. D. McKendry, E. Xie, R. Ferreira, E. Gu, M. D. Dawson, R. V. Penty, I. H. White

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Abstract

In this paper, feed-forward pre-equalization in conjunction with a PAM modulation scheme are proposed for use in wireless visible light communication (VLC) systems in order to enable the transmission of data rates > 1 Gb/s. Simulation results demonstrate that simple few-tap feed-forward pre-equalization is able to remove the inter-symbol-interference (ISI) caused by the limited link bandwidth of a line of sight (LOS) VLC link, providing up to 5 dB better receiver sensitivity compared with post-equalization. The pre-equalization scheme is implemented for a free-space VLC link using a PAM modulation scheme, which provides an enhanced spectral efficiency compared to NRZ modulation. Micro-pixelated LEDs (μLEDs) are used as the transmitter in this work, as they exhibit higher modulation bandwidth than conventional large-diameter LEDs. An avalanche photodiode (APD) is used at the receiver to provide an enhanced link power budget. Error-free (BER<10-12) 2 Gb/s freespace VLC transmission over 0.6 m is demonstrated experimentally using a simple 3-tap feed-forward pre-equalizer and a PAM-4 modulation scheme. The results show that feedforward pre-equalization with only a few taps can improve the μLED-based link performance greatly, providing a simple and cost-effective solution for high speed VLC links.

Original language	English
Pages (from-to)	2049-2055
Number of pages	7
Journal	Journal of Lightwave Technology
Volume	34
Issue number	8
Early online date	22 Jan 2016
DOIs	https://doi.org/10.1109/JLT.2016.2520503
Publication status	Published - 3 Mar 2016

Keywords

feed forward equalization
micro LED
pulse amplitude modulation
visible light communication

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Li-etal-IEEE-JLT-2016-Wireless-visible-light-communications-employing-feed-forward-pre-equalizationAccepted author manuscript, 1.21 MB

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@article{2efa6dc518c24f5793fcfd07533f164a,

title = "Wireless visible light communications employing feed-forward pre-equalization and PAM-4 modulation",

abstract = "In this paper, feed-forward pre-equalization in conjunction with a PAM modulation scheme are proposed for use in wireless visible light communication (VLC) systems in order to enable the transmission of data rates > 1 Gb/s. Simulation results demonstrate that simple few-tap feed-forward pre-equalization is able to remove the inter-symbol-interference (ISI) caused by the limited link bandwidth of a line of sight (LOS) VLC link, providing up to 5 dB better receiver sensitivity compared with post-equalization. The pre-equalization scheme is implemented for a free-space VLC link using a PAM modulation scheme, which provides an enhanced spectral efficiency compared to NRZ modulation. Micro-pixelated LEDs (μLEDs) are used as the transmitter in this work, as they exhibit higher modulation bandwidth than conventional large-diameter LEDs. An avalanche photodiode (APD) is used at the receiver to provide an enhanced link power budget. Error-free (BER<10-12) 2 Gb/s freespace VLC transmission over 0.6 m is demonstrated experimentally using a simple 3-tap feed-forward pre-equalizer and a PAM-4 modulation scheme. The results show that feedforward pre-equalization with only a few taps can improve the μLED-based link performance greatly, providing a simple and cost-effective solution for high speed VLC links.",

keywords = "feed forward equalization, micro LED, pulse amplitude modulation, visible light communication",

author = "X. Li and N. Bamiedakis and X. Guo and McKendry, {J. J. D.} and E. Xie and R. Ferreira and E. Gu and Dawson, {M. D.} and Penty, {R. V.} and White, {I. H.}",

note = "(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works",

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doi = "10.1109/JLT.2016.2520503",

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T1 - Wireless visible light communications employing feed-forward pre-equalization and PAM-4 modulation

AU - Li, X.

AU - Bamiedakis, N.

AU - Guo, X.

AU - McKendry, J. J. D.

AU - Xie, E.

AU - Ferreira, R.

AU - Gu, E.

AU - Dawson, M. D.

AU - Penty, R. V.

AU - White, I. H.

N1 - (c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works

PY - 2016/3/3

Y1 - 2016/3/3

N2 - In this paper, feed-forward pre-equalization in conjunction with a PAM modulation scheme are proposed for use in wireless visible light communication (VLC) systems in order to enable the transmission of data rates > 1 Gb/s. Simulation results demonstrate that simple few-tap feed-forward pre-equalization is able to remove the inter-symbol-interference (ISI) caused by the limited link bandwidth of a line of sight (LOS) VLC link, providing up to 5 dB better receiver sensitivity compared with post-equalization. The pre-equalization scheme is implemented for a free-space VLC link using a PAM modulation scheme, which provides an enhanced spectral efficiency compared to NRZ modulation. Micro-pixelated LEDs (μLEDs) are used as the transmitter in this work, as they exhibit higher modulation bandwidth than conventional large-diameter LEDs. An avalanche photodiode (APD) is used at the receiver to provide an enhanced link power budget. Error-free (BER<10-12) 2 Gb/s freespace VLC transmission over 0.6 m is demonstrated experimentally using a simple 3-tap feed-forward pre-equalizer and a PAM-4 modulation scheme. The results show that feedforward pre-equalization with only a few taps can improve the μLED-based link performance greatly, providing a simple and cost-effective solution for high speed VLC links.

AB - In this paper, feed-forward pre-equalization in conjunction with a PAM modulation scheme are proposed for use in wireless visible light communication (VLC) systems in order to enable the transmission of data rates > 1 Gb/s. Simulation results demonstrate that simple few-tap feed-forward pre-equalization is able to remove the inter-symbol-interference (ISI) caused by the limited link bandwidth of a line of sight (LOS) VLC link, providing up to 5 dB better receiver sensitivity compared with post-equalization. The pre-equalization scheme is implemented for a free-space VLC link using a PAM modulation scheme, which provides an enhanced spectral efficiency compared to NRZ modulation. Micro-pixelated LEDs (μLEDs) are used as the transmitter in this work, as they exhibit higher modulation bandwidth than conventional large-diameter LEDs. An avalanche photodiode (APD) is used at the receiver to provide an enhanced link power budget. Error-free (BER<10-12) 2 Gb/s freespace VLC transmission over 0.6 m is demonstrated experimentally using a simple 3-tap feed-forward pre-equalizer and a PAM-4 modulation scheme. The results show that feedforward pre-equalization with only a few taps can improve the μLED-based link performance greatly, providing a simple and cost-effective solution for high speed VLC links.

KW - feed forward equalization

KW - micro LED

KW - pulse amplitude modulation

KW - visible light communication

UR - http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7389958

U2 - 10.1109/JLT.2016.2520503

DO - 10.1109/JLT.2016.2520503

M3 - Article

SN - 0733-8724

VL - 34

SP - 2049

EP - 2055

JO - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

IS - 8

ER -

Wireless visible light communications employing feed-forward pre-equalization and PAM-4 modulation

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