Transmitter power control for a multicarrier visible light communication system

Abstract

AbstractHigher bandwidth becomes a major challenge in the development and implementation of visible light communication systems as transmission rates increase. One way of increasing bandwidth is through wavelength division multiplexing in multicarrier systems that use red, green, and blue light‐emitting diodes to produce white light. However, these systems often suffer from low performance as a result of crosstalk interference, mainly caused by the imperfect nature of optical filters used to discriminate between the colors. This paper demonstrates the use of centralized transmitter power control to predict the trends in the performance of a multicarrier visible light communication system that employs red and blue light emitting diodes. We have shown that, using a model that takes into consideration the effects of optical filters used for detection of colors at the receiver, one is able to predict the trends in the overall system's performance. This enables us to adequately determine the optimal power levels in the red and blue channels, which will result in the best overall performance of the system. Our model can be used in the design and implementation of multicarrier systems to minimize the crosstalk, which improves the performance, and lead to efficient higher bandwidth. The model is first implemented in computer simulations and then tested on an experimental set‐up to validate the results.