In free space optical communication, the effect of atmospheric turbulence, which causes fluctuations in received optical power, is inevitable. Based upon inhomogeneity in refractive index, the atmospheric turbulence can be classified into weak, moderate and strong turbulence. In this paper, analysis of FSO link for various modulation schemes such as OOK, BPSK, QPSK, 8-PSK and PAM-16 is carried out for Log-normal channel model (weak turbulence). BER is plotted with respect to SNR. Further, it is deduced that PAM-16 modulation scheme is better for overall range of SNR (-5 to 20 dB) considering log irradiance variance (?l 2) greater than 0.56
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Author Name: Archit Arora , Karan, Priyanka Bhardwaj
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Keywords: Free Space Optical (FSO) Communication, Log-Normal Channel Model, Bit Error Rate (BER), Atmospheric Turbulence, Log Irradiance Variance, Refractive Index Structure Parameter.