  Visible light communication is a promising technique in future networks due
to its advantages of high data rate and licensed-free spectrum. In addition,
non-orthogonal multiple access (NOMA) is considered as a candidate of multiple
access schemes in 5G networks and beyond. In this paper, we study the power
control problem in NOMA-based visible light communication. An optimization
problem is formulated, where the objective is the harmonic-rate utility
function. The optimal solution is achieved optimally by equivalently
transforming the underlying problem into a convex problem. Simulation result is
provided to validate performance of the proposed approach.
