2017/10/02 by Pranav Kumar Jha, Nitin Kachare, Jha, Pranav Kumar +4
Engineering · #Optical Wireless Communication Technologies #Satellite Communication Systems #Optical Network Technologies
paper · pdf · doi:10.48550/arxiv.1710.00484
The performance analysis of free space optical communication (FSO) system\nusing relays and spatial diversity at the source is studied in this paper. The\neffect of atmospheric turbulence and attenuation, caused by different weather\nconditions and geometric losses, has also been considered for analysis. The\nexact closed-form expressions are presented for bit error rate (BER) of M-ary\nquadrature amplitude modulation (M-QAM) technique for multi-hop multiple-input\nsingle-output (MISO) FSO system under log-normal fading channel. Furthermore,\nthe link performance of multi-hop MISO and multi-hop single-input and\nsingle-output (SISO) FSO systems are compared to the different systems using\non-off keying (OOK), repetition codes (RCs) and M-ary pulse amplitude\nmodulation (M-PAM) techniques. A significant performance enhancement in terms\nof BER analysis and SNR gains is shown for multi-hop MISO and multi-hop SISO\nFSO systems with M-QAM over other existing systems with different modulation\nschemes. Moreover, Monte-Carlo simulations are used to validate the accuracy\nand consistency of the derived analytical results. Numerical results show that\nM-QAM modulated multi-hop MISO and multi-hop SISO FSO system with relays and\nspatial diversity outperforms other systems while having the same spectral\nefficiency of each system.\n