Mobile optical wireless systems employing beam angle and power adaptation with diversity receivers

In this paper, we propose a mobile optical wireless (OW) system that employs beam angle and power adaptation in a line strip multibeam spot diffusing configuration in conjunction with an angle diversity receiver (APA-LSMS). Our goal is to improve the signal to noise ratio (SNR), reduce the delay spread and increase the received optical power under multipath dispersion, background noise and mobility. Our results demonstrate that the proposed system (APA-LSMS) at a bit rate of 50 Mbit/s achieves 43 dB SNR gain over a power adaptive line strip multibeam system (PA-LSMS) and 18 dB SNR gain over the power adaptive beam clustering method (ABCM) at 6 m transmitter-receiver horizontal separation. The results also show that APA-LSMS reduces the delay spread by a factor of 5 over ABCM. These improvements can enhance our system and enable it to operate at a higher data rate.