Abstract
In this paper, the information theoretic analysis of the decode-and-forward based dual hop free space optical (FSO) communication system is performed. The FSO links are modeled by the Gamma-Gamma distributed turbulence, pointing error, and path loss. For the considered cooperative system, using the statistical characteristics of the end-to-end SNR, new closed-form analytical expressions are obtained for the average channel capacity under simultaneous optimal power and rate adaptation (OPRA) and truncated channel inversion with fixed rate (TCIFR) adaptive transmission policies in terms of Extended Bivariate Generalized Meijer-G function. The effect of atmospheric conditions and pointing errors is analyzed by using the average channel capacity expressions. It is observed that the OPRA capacity outperforms the comparatively simpler TCIFR based capacity.
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