Poster: Model of extra power in the transmitter for high-speed visible light communication

This work addresses the extra power penalty caused by high-speed visible light communication (VLC) that adopting traditional lighting system, in particular, with OFDM as well as binary modulation such as PAM. In this work, we emphasize the use of switched mode power supply (SMPS) as current source for joint illumination and communication (JIC), although it is initially optimized for efficient lighting. The key components which potentially cause extra power in the transmitter are taken into account, including the SMPS, the field effect transistor (FET) modulator and the LEDs. An approximated model is derived to calculate the extra power in the SMPS. We compare the extra power loss in the modulator that operates in the saturation and linear region, according to the circuit bias point (Q-point) and the root mean square (rms) modulation depth, from a power and communication engineers perspective, respectively. The extra power loss in the LED is modelled by a DC and a non-linear resistance. The main merit of this work is that it presents a theoretical model to quantify the extra power loss that considering the paramount components in the transmitter.