TY - JOUR
T1 - Bias point optimisation in LiFi for capacity enhancement
AU - Zerihun Gutema, Tilahun
AU - Haas, Harald
AU - Popoola, Wasiu O.
N1 - © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works.
PY - 2021/8/31
Y1 - 2021/8/31
N2 - In this paper, we investigate methods to optimise the bias point of an LED to benefit from increasing bandwidth at higher driving current while minimising the resulting signal distortion. The approaches are based on allowing for some nonlinear distortion or to reduce signal swing/signal-to-noise ratio while benefiting from higher bandwidth at higher driving currents. A framework is presented to estimate the attainable capacity under both conditions. We also experimentally validate the optimisation with a PAM-4 based VLC system. The experimental results show that for a 40 , mathrm{mA} dynamic range VLMB1500 LED used, the optimum bias point is not in the middle of the dynamic range but at 31 , mathrm{mA}.
AB - In this paper, we investigate methods to optimise the bias point of an LED to benefit from increasing bandwidth at higher driving current while minimising the resulting signal distortion. The approaches are based on allowing for some nonlinear distortion or to reduce signal swing/signal-to-noise ratio while benefiting from higher bandwidth at higher driving currents. A framework is presented to estimate the attainable capacity under both conditions. We also experimentally validate the optimisation with a PAM-4 based VLC system. The experimental results show that for a 40 , mathrm{mA} dynamic range VLMB1500 LED used, the optimum bias point is not in the middle of the dynamic range but at 31 , mathrm{mA}.
KW - DC bias
KW - visible light communication (VLC)
KW - error vector magnitude (EVM)
KW - light emitting diode (LED)
KW - light fidelity (LiFi)
KW - orthogonal frequency division multiplexing (OFDM)
KW - pulse amplitude modulation (PAM)
KW - transmission capacity
U2 - 10.1109/JLT.2021.3083510
DO - 10.1109/JLT.2021.3083510
M3 - Article
SN - 0733-8724
VL - 39
SP - 5021
EP - 5027
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 15
ER -