Published July 11, 2021 | Version v1
Journal article Open

Bias Point Optimisation in LiFi for Capacity Enhancement

  • 1. The University of Edinburgh
  • 2. University of Strathclyde


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 mA dynamic range VLMB1500 LED used, the optimum bias point is not in the middle of the dynamic range but at 31 mA.



Additional details


ENLIGHTEM – European Training Network in Low-energy Visible Light IoT Systems 814215
European Commission