This technology is a visible light communication system and method where a controller calculates conditions to minimize power consumption while meeting received optical power and illuminance requirements, and dims an LED light source by signaling information according to those conditions. The receiver detects the dimmed light to receive signals and restore the information.
As frequency resources become limited, visible light communication, which transmits information via LED flickering, has gained attention as an alternative communication method. However, existing research has focused primarily on optimizing signal transmission. There has been a lack of methods for optimizing the energy consumed by light sources when performing both illumination and communication simultaneously.
This technology determines power minimization conditions using formulas that account for Gaussian shot noise from artificial light, the ratio of signal interval to symbol period, and minimum average optical power and illuminance requirements, while adjusting dimming by combining OOK and PWM. By flickering the light source more than 50 times per second, it maintains both lighting and communication without the user perceiving any flicker. It can be applied to office and indoor LED lighting-integrated communication networks and indoor positioning infrastructure, reducing communication power costs while adhering to lighting brightness standards.
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