Abstract

In this paper, we investigate the impact of nonzero boresight pointing errors on the performance of free-space optical (FSO) communication systems over Fisher-Snedecor <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathcal{F}$</tex> atmospheric turbulence channels. To this end, we derive simple and accurate approximations for the probability density function (PDF) and the cumulative distribution function (CDF). The derived PDF and CDF statistics are used to obtain analytical expressions for the outage probability and average bit error rate under two detection techniques, namely intensity modulation direct detection and heterodyne detection techniques. In addition, approximate expressions for the ergodic channel capacity in the high- and low-SNR regimes are derived. The analysis is numerically evaluated and supported by Monte-Carlo simulation results for different turbulence and pointing error scenarios. The results demonstrate that the derived approximate expressions are fairly accurate and provide a precise evaluation of the underlying analyses.

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