Abstract

Non-line-of-sight (NLOS) optical wireless communications using ultraviolet radiation and relying on atmospheric scattering has been proposed for short-range non-line-of-sight connectivity. Compared with single-input single-output (SISO) systems, single-input multiple-output (SIMO) communication systems can offer receiver diversity in channels that have faded due to turbulence. However, the portion of the transmission path from the transmitter and the scattering volume is shared by the multiple channels, leading to channel gain correlations and thus degraded system performance. In this paper, we first study the channel correlations under log-normal and gamma–gamma turbulence, both analytically and numerically. Then, we investigate the outage probability based on the channel capacity. Due to scattering, the results are observed to be significantly different from traditional line-of-sight free-space optical communications. For a communication system with one transmitter and two receivers, the subchannel correlation coefficient can be more than 0.8 for two receivers, even if they are separated by several meters. The proposed model can well characterize the outage probability, especially for small transmission beam widths.

© 2016 Optical Society of America

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