Genetic algorithm channel control for indoor optical wireless communications

A genetic algorithm controlled multispot transmitter is proposed as an alternative approach to optimising the power distribution for single element receivers in fully diffuse mobile indoor optical wireless communication systems. Results are presented that show by dynamically controlling the powers of individual diffusion spots, a consistent power distribution, with negligible impact to bandwidth and rms delay spread, can be created in multiple rooms, independent of the reflection characteristics and user movement patterns. The advantageous adaptability of the genetic algorithm approach removes the need for bespoke design and provides for a more cost effective system, capable of deployment in multiple locations whilst improving end user friendliness. Results have been presented based around the use of a single element receiver with a FOV = 55deg in conjunction with two algorithms that are shown to be capable of reducing the dynamic range, referenced against the peak received power, by up to 26% when empty and furthermore, maintaining to the within 7% of this optimised case, the power distribution when the user perturbs the channel through movement.