Optimal Precoding Design for VLC MIMO-OFDM Systems in the Presence of Clipping Noise

Abstract

This paper investigates the optimal linear precoder for multi-carrier visible light communication (VLC) multiple-input multiple-output (MIMO) systems. In a practical VLC system, the limited linear region of light-emitting diodes (LEDs) leads to the clipping noise at the transmitter. The optimal precoder are designed to minimize the mean square error (MSE) at each subcarrier in the presence of clipping noise. Two problems are mainly solved: firstly, find the optimal input power of each LED to decrease the effect of clipping. Secondly, allocate these power for a precoder to minimize MSE. The joint clipping and precoding algorithm (JCPA) is proposed to solve the whole problem. Simulation results have demonstrated that the proposed scheme outperforms the existing solutions.