An expression for the bit error rate of a multiple subcarrier intensity-modulated atmospheric optical communication system employing spatial diversity is derived. Spatial diversity is used to mitigate scintillation caused by atmospheric turbulence, which is assumed to obey log-normal distribution. Optimal but complex maximum ratio, equal gain combining (EGC) and relatively simple selection combining spatial diversity techniques in a clear atmosphere are considered. Each subcarrier is modulated using binary phase shift keying.
- optical communication system
- spatial diversity
- binary phase shift keying
Popoola, W. O., Ghassemlooy , Z., Allen, J., Leitgeb, E., & Gao, S. (2008). Free-space optical communication employing subcarrier modulation and spatial diversity in atmospheric turbulence channel. IET Optoelectronics, 2(1), 16-23 . https://doi.org/10.1049/iet-opt:20070030