Abstract
The bit error rate of direct-detection, avalanche photodiode (APD) based free-space optical (FSO) communication systems is studied. The system of interest utilizes pulse-position modulation (PPM) and is subjected to scintillation due to optical turbulence. A weak turbulence (clear-air) scenario is considered for which the received signal intensity may be modelled as a log-normal random process. To arrive at the desired results, it is assumed that the system utilizes binary PPM (BPPM) modulation scheme. Furthermore, it is assumed that the receiver thermal noise is non-negligible and that the average signal intensity is large enough to justify a Gaussian approximation at the receiver. Numerical results are presented for the BPPM case to shed light on the impact of turbulence on the overall performance.
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