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Optical Communication Using Subcarrier Intensity Modulation in Strong Atmospheric Turbulence

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2 Author(s)
Xuegui Song ; Sch. of Eng., Univ. of British Columbia, Kelowna, BC, Canada ; Julian Cheng

Error rate performance of subcarrier intensity modulations is analyzed for optical wireless communications over strong atmospheric turbulence channels. We study the error rate of a subcarrier intensity modulated optical wireless communication system employing M -ary phase-shift keying, differential phase-shift keying, and noncoherent frequency-shift keying. Both K -distributed turbulence channel (strong) and negative exponential turbulence channel (saturated) are considered. Closed-form error rate expressions are derived using a series expansion of the modified Bessel function. Furthermore, the outage probability expressions are obtained for subcarrier intensity modulated optical wireless communication systems over the K-distributed turbulence and the negative exponential channels. Asymptotic error rate analysis and truncation error analysis are also presented. Our asymptotic analysis shows that differential phase-shift keying suffers a constant signal-to-noise ratio performance loss of 3.92 dB with respect to binary phase-shift keying under strong atmospheric turbulence conditions. The numerical results demonstrate that our series solutions are efficient and highly accurate.

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Lightwave Technology, Journal of  (Volume:30 ,  Issue: 22 )