Angle and power adaptation in 10 Gbit/s multibeam mobile optical wireless systems with angle diversity detection

In this paper, we propose, evaluate and analyse for the first time a mobile optical wireless (OW) system that operates at 10 Gbit/s. We propose a mobile OW system that employs beam angle and beam power adaptation in a line strip multibeam spot diffusing system configuration in conjunction with an angle diversity receiver (APA-LSMS), to reduce the impact of ambient light noise, multipath dispersion and mobility induced impairments. Our simulation results demonstrate that the proposed APA-LSMS at a bit rate of 5 Gbit/s achieves about 30 dB signal-to-noise ratio (SNR) gain over a power adaptive line strip multibeam system (PA-LSMS) where transmitter - receiver ranges up to 6 m (horizontal separation) were considered. Our results also indicate that the APA-LSMS achieves a consistent 24 dB and 21 dB SNR at 5 Gbit/s and 10 Gbit/s, respectively, in the presence of background shot noise, multipath dispersion and mobility. Furthermore, the results show an increase in the channel bandwidth from 25.5 MHz for a conventional diffuse system (CDS) to approximately 7.2 GHz in our proposed system (APA-LSMS). These improvements enhance our system and enable it to operate at a higher data rate of 10 Gbit/s.