In this work, the performance of binary phase shift keying (BPSK) subcarrier intensity-modulated terrestrial free-space optical (FSO) communication link is analysed in the presence of noise and atmospheric turbulence. To ameliorate channel fading caused by the atmospheric turbulence, we propose a subcarrier time delay diversity (STDD) scheme in which the delayed versions of the original data are re-transmitted on different subcarriers. In short range links, a single re-transmission scheme results in an estimated gain of up to 4.5 dB in received irradiance.
- binary phase shift keying
- atmospheric turbulence
Popoola, W. O., Ghassemlooy , Z., Haas, H., Leitgeb, E., & Ahmadi, V. (2012). Error performance of terrestrial free space optical links with subcarrier time diversity. IET Communications, 6(5), 499 - 506 . https://doi.org/10.1049/iet-com.2011.0107