Abstract
In this paper, we evaluate the performance of a selective-relaying (SR) protocol
that is suitable for cooperative free-space optical (FSO) communications with any number
of relays. The SR strategy is based on transmitting all information symbols either along
the direct link between the source and the destination or along one of the indirect
links via the relays. We derive closed-form expressions of upper-bounds on the average
error probability that can be achieved over Rayleigh and lognormal fading channels. We
also provide an asymptotic analysis for quantifying the diversity gain and reduction in
fading variance that can be realized by the cooperative scheme. The performance analysis
shows the superiority of the SR scheme over the strategy that corresponds to activating
all available links.
© 2013 IEEE
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