Abstract
Fading and path loss are the major challenges in practical deployment of free
space optical communication systems. In this paper, a cooperative free space
communication via an optical amplify-and-forward relay is considered to deal with these
challenges. We use photon counting approach to investigate the system bit error
probability (BEP) performance and study the effects of atmospheric turbulence,
background light, amplified spontaneous emission, and receiver thermal noise on the
system performance. We compare the results with those of the multiple-transmitter (MT)
system. The results indicate that the performance of the relay-assisted system is much
better than that of the MT system in different cases considered. We show that there is
an optimum place for the relay from the BEP point of view.
© 2010 IEEE
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