Adaptive 10 Gbit/s Mobile Optical Wireless Systems Employing Beam Delay, Angle and Power Adaptation with Imaging Receivers

Abstract

In this paper, we propose a novel mobile optical wireless (OW) system that employs for the first time beam delay adaptation, and makes use of angle and power adaptation in a line strip multibeam spot diffusing configuration in conjunction with an imaging receiver (BDAPA-LSMS). Our ultimate goal is to improve the bandwidth, reduce the effect of inter-symbol-interference (ISI), and increase the signal to noise ratio (SNR) when the transmitter operates at a higher data rate under the impact of multipath dispersion, background noise and mobility. An increase in channel bandwidth from 36 MHz, typical in a conventional diffuse system (CDS), to about 9.8 GHz can be achieved when our methods of beam delay, angle and power adaptation coupled with an imaging receiver are employed. At a bit rate of 30 Mbit/s our proposed BDAPA-LSMS achieves about 50 dB signal-to-noise ratio gain over conventional diffuse non-imaging systems. Moreover, our simulation results show that the proposed BDAPA-LSMS at a bit rate of 10 Gbit/s achieves about 32.3 dB signal-to-noise ratio at the worst communication path in the presence of background noise and mobility thus achieving a BER below i?10i?^(-9) .