Amplify-and-Forward Two-Way Relaying System over Free-Space Optics Channels
"In this paper, we analyze the performance of a two-way
subcarrier intensity-modulated (SIM) amplify-and-forward (AF)
relaying system over free-space optics (FSO) communication channels.
The analysis takes into consideration attenuations due to atmospheric
turbulence, geometric spread and pointing errors at the
same time. We derive, in generalized infinite power series expressions,
the tight upper and lower bounds of the overall outage probability
and average probability of errors of the system. The study
finds that this two-way subcarrier intensity-modulated AF relaying
system using a binary phase shift keying (BPSK) modulation
could be used for practical applications in case of a weak turbulence
regime in which the required SNR is about 30 dB to obtain
the average bit error probability of 106. It is also noted that the
pointing errors clearly degrade the performance of the two-way
subcarrier intensity-modulated AF relaying system."