Abstract
Satellite optical communication has many quality features, such as high data rate and license free. Unfortunately, atmospheric turbulence can affect optical transmissions between satellite and ground station for downlink and uplink optical communications. To counterbalance this reduction, spatial diversity is an attractive technique. In this paper, we investigate the bit-error rate (BER) of downlink laser communication with differential phase shift keying (DPSK) modulated heterodyne multiple apertures receiver system over atmospheric fading channels. Approximated average BER expression equations for downlink equal gain combining (EGC) and maximum ratio combining (MRC) multiple apertures receiver system and exact expression equation of selection combining (SC) receiver system with spatial diversity are obtained over Gamma–Gamma distributed atmospheric channel. We study the communication performances of DPSK modulated multiple apertures and single aperture receiver system under the same condition in terms of zenith angle and signal-to-noise ratio (SNR). All the analytical results are comparatively studied by Monte-Carlo (MC) simulations.
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