Power optimization under brightness and communication requirements for visible light communication based on MacAdam ellipse

Data transmission with RGB LEDs is attracting significant research interest in VLC (Visible Light Communication). We consider the power optimization under brightness and communication requirements for RGB LEDs, and model the color constraint using the MacAdam ellipse instead of a fixed point in the chromaticity diagram. Then an optimization problem is formulated to determine the transmission power consumption and the corresponding coordinates in the chromaticity diagram. We propose a novel two-step algorithm to solve the optimization problem with lower implementation complexity. Numerical results show that the proposed approach shows the same performance as the optimal solution using a brute-force method, and requires the lower power consumption using MacAdam ellipse instead of merely a fixed point in the chromaticity diagram.