Abstract
An optical signal suffers from irradiance and phase fluctuations when propagating through
the free space optical (FSO) turbulence channel, thus resulting in the degradation of the bit
error rate (BER) performance. The BER performance can be improved by adopting the multiple-input
multiple-output (MIMO) scheme. In this paper, we propose a coherent binary polarization shift
keying (BPOLSK) modulation scheme with MIMO employing maximum ratio combining and equal gain
combining diversity techniques to mitigate the turbulence effect. The gamma–gamma statistical
channel model is adopted for all the turbulence regimes. The BER performance for the proposed
BPOLSK-MIMO FSO link is compared with the single-input single-output and ON–OFF-keying systems by
means of computer simulation. The optical power gain is investigated and demonstrated under
different turbulence regimes for a number of transmitters/receivers.
© 2013 IEEE
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