Improved power distribution in diffuse Indoor Optical Wireless systems employing multiple transmitter configurations

Abstract

Power distribution plays a vital role in the performance of diffuse indoor optical wireless systems. Commonly used single-transmitter diffuse systems result in non-uniform power distribution patterns. We propose the use of multiple transmitters, suitably placed at different locations on the ceiling, as a technique to obtain fairly uniform power distribution on the floor. In this paper we use an extension of the recursive method developed by J.R. Barry and J.M. Kahn (IEEE Sel. Area Commun. 1 367, 1993), to compute multi-path impulse response and power distribution. We show that placement of the transmitters is crucial in achieving near uniform power distribution. Effect of the number of transmitters on power distribution and the channel bandwidth are also examined.