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

Abstract

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.

Spectral Design of Phosphor-Converted LED Lighting Guided by Color Theory

“…The ellipses are described using numerical steps representing the same number of standard deviations away from the reference color point. The creation of the MacAdam ellipses is instrumental to lighting because it allows researchers to express a tolerance around a target color . Lighting companies, for example, typically require their materials to fall within a three or four-step MacAdam ellipse during their operational lifetime.…”

“…The creation of the MacAdam ellipses is instrumental to lighting because it allows researchers to express a tolerance around a target color. 68 Lighting companies, for example, typically require their materials to fall within a three or fourstep MacAdam ellipse during their operational lifetime. Conversely, two devices made with two different phosphor blends should have chromaticity coordinates within a two-step MacAdam ellipse to ensure that comparisons of the color rendering or LER are being made for light sources with indistinguishable perceived colors.…”

Dynamic Route Discovery Using Modified Grasshopper Optimization Algorithm in Wireless Ad-Hoc Visible Light Communication Network

“…The developed dynamic routing protocol needs to address the security processes for protecting the network and its nodes in order to ensure a correct route between the nodes. In addition, S. Lou et al [17] developed a new two-step algorithm for reducing the optimization problem with low implementation complexity in the VLC networks. The numerical outcome showed that the developed algorithm achieved optimal solution compared to brute force technique in light of total transmission power.…”