KEYWORDS: Satellites, Atmospheric turbulence, Satellite communications, Receivers, Optical communications, Telecommunications, Signal to noise ratio, Monte Carlo methods, Transmittance, Modulation
The performances of satellite-to-ground downlink optical communications over Gamma-Gamma distributed turbulence are studied for multiple apertures receiver system. Maximum ratio combining (MRC) technique is considered as a combining scheme to mitigate the atmospheric turbulence under thermal noise limited conditions. Bit-error rate (BER) performances for on-off keying (OOK) modulated direct detection optical communications are analyzed for MRC diversity receptions through an approximation method. To show the net diversity gain of multiple apertures receiver system, BER performances of MRC receiver system are compared with a single monolithic aperture receiver system with the same total aperture area (same average total incident optical power) for satellite-to-ground downlink optical communications. All the numerical results are also verified by Monte-Carlo (MC) simulations.
The performances of satellite‐to‐ground downlink optical communications over Gamma–Gamma distributed turbulence are studied for a multiple‐aperture receiver system. Equal gain‐combining (EGC) and selection‐combining (SC) techniques are considered as practical schemes to mitigate the atmospheric turbulence under thermal‐noise‐limited conditions. Bit‐error rate (BER) performances for on‐off keying‐modulated direct detection and outage probabilities are analyzed and compared for SC diversity receptions using analytical results and for EGC diversity receptions through an approximation method. To show the net diversity gain of a multiple‐aperture receiver system, BER performances and outage probabilities of EGC and SC receiver systems are compared with a single monolithic‐aperture receiver system with the same total aperture area (same average total incident optical power) for satellite‐to‐ground downlink optical communications. All the numerical results are also verified by Monte‐Carlo simulations.
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