Performance analysis of FSO links under strong atmospheric turbulence conditions using various modulation schemes |
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| Authors: | K Prabu D Sriram Kumar T Srinivas |
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| Institution: | 1. Department of Electronics and Communication Engineering, National Institute of Technology (NIT), Tiruchirappalli 620015, India;2. Department of Electrical Communication Engineering, Indian Institute of Science (IISc), Bangalore 560012, India |
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| Abstract: | Strong atmospheric turbulence is a major hindrance in wireless optical communication systems. In this paper, the performance of a wireless optical communication system is analyzed using different modulation formats such as, binary phase shift keying-subcarrier intensity modulation (BPSK-SIM), differential phase shift keying (DPSK), differential phase shift keying-subcarrier intensity modulation (DPSK-SIM), M-ary pulse position modulation (M-PPM) and polarization shift keying (PolSK). The atmospheric channel is modeled for strong atmospheric turbulences with combined effect of turbulence and pointing errors. Novel closed-form analytical expressions for average bit error rate (BER), channel capacity and outage probability for the various modulation techniques, viz. BPSK-SIM, DPSK, DPSK-SIM, PolSK and M-PPM are derived. The simulated results for BER, channel capacity and outage probability of various modulation techniques are plotted and analyzed. |
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| Keywords: | Free space optics Binary phase shift keying-subcarrier intensity modulation Differential phase shift keying Differential phase shift keying subcarrier intensity modulation Polarization shift keying |
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