Linear Precoding for MU-MISO VLC Systems With Noisy Channel State Information

In this letter, we study a multi-user multiple-input single-output (MU-MISO) visible light communication (VLC) system. The linear precoding for pulse amplitude modulation signal is developed with noisy channel state information (CSI). In this method, the precoding is formulated to achieve user fairness with the constraint of the current range of lighting emitting diodes. The precoding design is got by an iterative algorithm involving convex optimization problems, and a simplified algorithm for the strong channel error is developed based on the pseudo-inverse zero-forcing method. Simulation results demonstrate that the proposed precoding can achieve a good performance in an MU-MISO VLC system with noisy CSI.