Effect of transmitter positions on received power and bandwidth in diffuse indoor optical wireless systems

Abstract

Diffuse Indoor Optical wireless systems (DIOWS) have potential applications in indoor WLAN. The major problems faced by these systems are their reduced bandwidth and restricted mobility caused by multi-path reflections from the indoor surfaces. These systems also suffer from non-uniform power distribution. Over the last decade several techniques have been suggested to circumvent these problems, most of them requiring complex trans-receiver design. One simple technique that can solve the non-uniformity problem is the use of multiple sources in place of a single source. In this paper we compare the received power levels on the floor computed using the extended ceiling bounce and the modified recursive models. The effect of multiple sources and their positions on the channel bandwidth is also analyzed. We show that the channel bandwidth for a given trans-receiver configuration depends on both the horizontal separation (between the transmitter and the receiver) and their actual positions.