A RGB LED PAM-4 Visible Light Communication Transmitter Based on a System Design with Equalization

Visible light communication technology has high security and anti-interference in electromagnetic interference environment. The use of LED devices in optical transmitters has the advantages of low cost and low power consumption, but it is also limited by the low bandwidth of the components. In this context, a PAM-4 VLC transmitter system with pre- and post-equalization using three-color RGB LEDs as light-emitting devices was established. According to the experimental results, the communication system under test using the pre- and post-equalizations can achieve a data transmission rate of 2.9 times and a 2.5 times expanded bandwidth.