DIMMING CONTROL FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING-BASED VISIBLE LIGHT COMMUNICATION

摘要

A method of dimming control for orthogonal frequency division multiplexing (OFDM)-based visible light communication (VLC). The method includes transmitting, by an optical communication device, an optical signal using OFDM with all active sub-carriers when a first dimming level is observed, transmitting, by the optical communication device, the optical signal using OFDM with a first subset of active sub-carriers and without sub-carrier index modulation (SIM) when a second dimming level is observed, wherein the second dimming level is less than the first dimming level; and transmitting, by the optical communication device, the optical signal using OFDM with a second subset of active sub-carriers and with SIM when a third dimming level is observed, wherein the second subset of the active sub-carriers is smaller than the first subset of the active sub-carriers, and wherein the third dimming level is less than the second dimming level.