Adaptive multibeam clustering angle diversity optical wireless system

In this paper, we propose a novel mobile optical wireless (OW) system that employs an adaptive beam clustering method (ABCM) to improve system performance. The main goal is to increase the received optical power, reduce the effect of intersymbol interference (ISI), and improve the signal-to-noise ratio (SNR) when the system operates under the constraints of Background noise, multipath dispersion, and mobility. Our proposed system (adaptive beam clustering transmitter with diversity receiver) is evaluated at 50 Mbit/s to enable comparison with previous work, and is also assessed at higher bit rates: 2.5 Gbit/s and 5 Gbit/s. Simulation results show that at a bit rate of 50 Mbit/s, a significant SNR improvement of 15 dB is achieved when an ABCM system replaces a line strip multibeam system (LSMS) at a 6 m transmitter-receiver horizontal separation. This SNR improvement can be used to reduce the transmit power at this bit rate (50 Mbit/s). The results also show that the angle diversity ABCM system increases the channel bandwidth from 37.6 MHz (a conventional diffuse system (CDS)) to 4.7 GHz. The increase in SNR and channel bandwidth is used to achieve higher data rates: 2.5 Gbit/s and 5 Gbit/s.