Abstract: This study carry out the performance analysis of bit error rate of free space optical communication system over Nakagami - m fading channel. In this paper, the performance of free space optical communication in the presence of the atmospheric turbulence is presented. Weak turbulence is modeled as log normal distribution of Nakagami-m channel and strong turbulence is modeled as Gamma-Gamma distribution of Nakagami-m channel. The performance controlling parameters are outage probability and bit error rate. In this case, BER and outage probability is studied with different level of channel turbulence in free space optical communication.

Keywords: Atmospheric turbulence, bit error probability, free space optical system, outage probability, Nakagami m fading channel.