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自由空间光通信(FSO)系统的性能由于受大气湍流影响会产生剧烈波动。根据系统和大气参数评估系统差错性能的研究具有现实意义。以大气湍流信道和光电探测两个模型为基础,建立了FSO系统差错性能的数学仿真模型,提出了湍流条件下系统误码率计算公式。对仿真结果与弱湍流条件下获得的实验数据进行了比较,并依据此模型对光强起伏和背景噪声等因素的影响进行仿真。仿真结果表明,基于该模型的仿真结果与实验数据一致,光强起伏是引起系统性能波动的主要因素,最优判决阈值需根据实际大气条件进行调整。该模型可有效评估湍流条件下FSO系统性能,并为相关理论研究提供参考。
The performance of free space optical communications (FSO) systems can fluctuate dramatically due to turbulence in the atmosphere. It is of practical significance to evaluate system error performance based on system and atmospheric parameters. Based on two models of atmospheric turbulence channel and photoelectric detection, a mathematical simulation model of the error performance of FSO system is established, and the formula of the system bit error rate under turbulent flow conditions is proposed. The experimental data obtained under the condition of weak turbulence are compared with the simulation results and the influence of the model on the factors such as light intensity fluctuation and background noise is simulated. The simulation results show that the simulation results based on this model are consistent with the experimental data. The fluctuation of light intensity is the main factor causing the system performance fluctuation. The optimal decision threshold needs to be adjusted according to the actual atmospheric conditions. The model can effectively evaluate the performance of FSO under turbulent conditions and provide reference for relevant theoretical research.