Relay Selection for Full-Duplex FSO Relays Over Turbulent Channels
Résumé
This paper investigates the performance of the
best relay selection, based on the max-min signal-to-noise ratio
criterion for dual-hop free-space optical (FSO) full-duplex (FD)
relays communication system. Decode-and-forward relays over
log-normal (LN) channels for weak-to-moderate turbulence and
gamma-gamma (G-G) channels for strong turbulence are con-
sidered. We assume that the relays have full channel knowledge
and the channel is symmetrical. Considering path loss effects and
misalignment errors, the outage probability (OP) of the selection
is obtained for both half-duplex (HD) and FD relays using the
cumulative distribution function (CDF) of the best selection for
LN and G-G random variables. Moreover, the average bit error
rate (ABER) expressions for FSO communication system over
LN channels are derived with the help of Gauss-Laguerre’s
quadrature rule for HD relays, FD relays and direct link. Our
results show that FD relays have lowest ABER and OP compared
with the direct link and HD relays. Monte Carlo simulations
corroborate the correctness of the obtained analytical results.