Abstract
A Gaussian minimum frequency shift keying (GMSK) modulation based on the exponentiated Weibull (EW) distributed atmospheric attenuation channel model for satellite-terrestrial laser communication downlink is proposed in this paper. Taking into account the common effects of intensity scintillation, pointing error and angle of arrival (AOA) fluctuations, the closed-form expression of bit error rate (BER) of GMSK modulation system is derived. In the case of weak, medium and strong atmospheric turbulence, the communication performance of downlink GMSK modulation system is studied by analyzing the relationship between signal-to-noise (SNR) ratio and bit error rate. The effects of zenith angle, divergence angle, transmitter beam radius and receiver aperture on the performance of satellite-terrestrial laser communication system are also studied. This work provides a theoretical basis for system performance analysis of satellite-terrestrial laser communication downlink.
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