Abstract
This study investigates the unified performance of a free space optical link with a finite-sized receiver over an exponentiated Weibull distributed atmospheric turbulence in the presence of a misalignment error (ME). The unification is done for two detection techniques namely heterodyne and intensity modulation/direct detection. First, the unified expressions for probability density function, cumulative distribution function, moment generating function, and moments of instantaneously received signal-to-noise ratios (SNRs) at the receiver, have been derived. By utilising the derived statistics, the unified novel expressions for outage probability, average error probability (AEP), and ergodic capacity are obtained. Furthermore, the AEP performance is examined at a high SNR in order to obtain the diversity order and coding gain, analytically. The derived results clearly demonstrate the impact of severe atmospheric conditions, ME, aperture size, and type of detection scheme on the system performance. The derived analytical results are verified through simulations.
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