Bit-error Rate Analysis of Coherent Detection Equal Gain Combining Spatial Diversity Receivers for Satellite-to-Ground Downlink Optical Transmissions

Kangning Li, Bo Lin, Jing Ma, Mengnan Li


In this paper, the error performance of coherent detection multiple apertures receiver system is evaluated for satellite-to-ground downlink optical communications. Bit-error rate (BER) expressions of equal gain combining (EGC) receiver system are given for binary phase-shift keying (BPSK) modulation schemes under Gamma-Gamma channel model atmospheric turbulence. Monte Carlo (MC) simulations are used to analyze the BER performance for different number of apertures with the same total aperture area. It is found that coherent detection multiple apertures receiver system can greatly improve the system performance for EGC diversity, but the improved rate of diversity gain decreases with the increase of diversity branches.


spatial diversity; satellite optical communication; coherent detection; equal gain combining


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