Abstract
In this paper, a repetition code (RC) coherent orthogonal frequency division multiplexing (OFDM) single input multiple output (SIMO) system based on the exponential Weibull distribution model is proposed for downlink satellite–terrestrial laser communication. The closed form expression of bit error rate (BER) of the SIMO RC-OFDM system is derived by considering the joint effect of downlink intensity scintillation and angle of arrival fluctuation (AOA). The relationship between the BER and signal-to-noise ratio (SNR) of uncoded system and SIMO RC-OFDM system is compared under weak, medium and strong atmosphere turbulence, and the influence of the number of receiver antennas on the SIMO RC-OFDM system is studied. At the same time, under the condition of weak turbulence, the influence of important indicators such as zenith angle, receiving aperture, optimal beam divergence angle, and optimal transmission radius on the satellite–terrestrial laser communication downlink SIMO RC-OFDM system is analyzed. The Monte Carlo (MC) principle uses randomness to solve integral problems, and the obtained results are verified by MC simulations. This work provides a theoretical basis for research on coding technology in satellite–terrestrial laser downlink communication SIMO systems.
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