The misalignment errors and fluctuations in irradiance due to
atmospheric turbulence can severely degrade the performance of free-space
optical (FSO) systems. In this paper, we investigate the asymptotic bit
error rate (BER) performance and diversity orders of FSO links using
parallel transmit-diversity schemes. The BER expressions of FSO links with
the switch-and-examine transmit (SET), switch-and-examine transmit with
post-selection (SETps), dual-branch transmit laser selection (Dual-TLS),
and group transmit laser selection (Group-TLS) schemes are derived, based
on an approximate channel model. Then numerical simulations for these four
schemes in the region of high average signal-to-noise ratio (SNR) are
presented under different channel conditions. The results show that the
four transmit-diversity schemes can reduce system complexity and overcome
the limitation of peak power, without much BER deterioration.
© 2016 Optical Society of Korea
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