Behavior of non-directed optical wireless channel considering receiver orientation

Abstract

In this article, we investigate the feasibility of an infrared uplink regardless of the position of the transmitter in the environment when the receivers are positioned at each corner of a square central luminaire. This configuration could correspond to a luminaire used also for downlink communication in visible range. The scenario is studied as an alternative easier to implement than classical one where the receivers are uniformly distributed over the ceiling and oriented perpendicularly towards the floor. Our main objective is to determine for our scenario the best orientations of the receivers using diversity technique to obtain at least the same performance as in the classical case. For this purpose, we use channel simulations based on ray-tracing method to obtain the optical gain statistics. The results obtained from the analysis show that for the investigated scenario it is possible to obtain a better performance than with perpendicular oriented receivers spatially distributed over the ceiling. Experimentations permit validating theoretical results regarding receiver orientation impact.