Performance of satellite-quasi-stationary aircraft-terrestrial laser communication system based on F-distribution

In the downlink of satellite-terrestrial laser communication system, the quasi-stationary aircraft is proposed to improve the system performance. Considering the light intensity scintillation, angle of arrival (AOA) fluctuations and pointing errors, the closed expression of bit error rate (BER) of satellite-quasi-stationary aircraft-terrestrial laser communication system (SHTLC) is derived under F-distribution atmospheric turbulence model. The effects of quadrature amplitude modulation (QAM), differential phase shift keying (DPSK) and minimum shift keying (MSK) on the performance of SHTLC system are simulated and analyzed under strong and weak turbulence. The results show that the SHTLC system has better communication performance with QAM modulation. Meanwhile, the relationships between the average SNR and BER of SHTLC system under different turbulence conditions are simulated and analyzed. In addition, the influence of zenith angle, divergence angle, transmitter beam radius and receiving aperture on the performance of the system is also studied.