BER Performance Analysis for Digital Modulation Techniques in AWGN Channel of FSO Communication System with Low Attenuation Coefficient

BER is a potential methodology for examining digital transmission systems by providinga measurable and useful indication of system performance. If the BER rises within limitthen the system performance will be obviously satisfactory. The paper represents BERperformance of FSO communication system for a few number of digital modulationtechniques: BPSK, QPSK, 4-QAM and 16-QAM in AWGN channel by exploiting theMatlab simulated BER versus SNR graphs. The numerical BER results indicate thatBPSK modulation is comparatively better than other modulation techniques. In addition,High data rate transmission in FSO system can be performed by adapting additionaldigital modulation techniques: QPSK, 4-QAM and 16-QAM which are also explored inthis paper. Moreover, the paper emphasizes on several modulation schemes with theconsideration of low attenuation coefficient which is one of the challenge of datatransmission for FSO communication system.