  Optical wireless communication (OWC) is highly vulnerable to the atmospheric
turbulence and pointing error. Performance analysis of the OWC system under the
combined channel effects of pointing errors and atmospheric turbulence is
desirable for its efficient deployment. The widely used Gamma- Gamma
statistical model for atmospheric turbulence, which consists of Bessel
function, generally leads to complicated analytical expressions. In this paper,
we consider the three-parameter exponentiated Weibull model for the atmospheric
turbulence to analyze the ergodic rate and average signal-to-noise ratio (SNR)
performance of a single-link OWC system. We derive simplified analytical
expressions on the performance under the combined effect of atmospheric
turbulence and pointing errors in terms of system parameters. We also derive
approximate expressions on the performance under the atmospheric turbulence by
considering negligible pointing error. In order to evaluate the performance at
high SNR, we also develop asymptotic bounds on the average SNR and ergodic rate
for the considered system. We demonstrate the tightness of derived expressions
through numerical and simulation analysis along with a comparison to the
performance obtained using the Gamma-Gamma model.
