BINARY PUSE POSITION MODUlATION (BPPM) BIT ERROR RATE (BER) ANAlYSIS IN TURBUlENT ATMOSPHERE

The major limitation of free space optical communication system performance is due to the atmosphere eventhough there are high technical advancement of available components. in atmospheric scenario, the high impairment comes from scintillation induced by atmospheric turbulence. the suitable modulation should be use to get the best system performance. from previous research, it is proven that pulse position modulation (ppm) shows better performance compared to on- off keying (ook) modulation for intensity modulation with direct detection. in this paper, binary pulse position modulation (bppm) is studied when atmospheric turbulence occurs. the performance of this modulation system evaluates in terms of the bit error rate and eye diagram. the simulation system links are done to observe the ber performance. the ber is investigated for various parameters such as gain of photodetector and various scintillation index.