In this paper, we analyze the performance of a two- way subcarrierintensity-modulated (SIM) amplify-and-forward (AF) relaying system overfree-space optics (FSO) communication channels. The analysis takes intoconsideration attenuations due to atmospheric turbulence, geometric spread andpointing errors at the same time. We derive, in generalized infinite powerseries expressions, the tight upper and lower bounds of the overall outageprobability and average probability of errors of the system. The study findsthat this two-way subcarrier intensity- modulated AF relaying system using abinary phase shift keying (BPSK) modulation could be used for practicalapplications in case of a weak turbulence regime in which the required SNR isabout 30 dB to obtain the average bit error probability of 10-6. It is alsonoted that the pointing errors clearly degrade the performance of the two-waysubcarrier intensity-modulated AF relaying system.
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