Joint Precoder and DC Bias Design for MIMO VLC Systems

Visible light communication (VLC) can provide high-speed data transmission and meet the daily illumination demand simultaneously, and thus emerges as a promising technology for future indoor wireless communication. This paper proposes effective methods to jointly design the precoder and DC bias for multiple-input multiple-output (MIMO) VLC systems. The design goal is to minimize the mean square error (MSE) between the transmitted and received VLC signals. The nonnegative constraint on the transmitted signal and two different power constraints are considered. We first consider the per-LED power constraint and propose an effective solution to the precoder design problem. Then, the proposed method is extended to address the similar joint precoder and bias design problem under the sum power constraint. Finally, the performance of the proposed precoder and DC bias designs is evaluated via simulations.