Abstract. Performance metrics such as mean-bit-error rate and probability of fade for free-space optical communication (FSOC) applications using intensity-modulation direct detection are theoretically calculated based on probability density functions (PDFs) describing irradiance fluctuations. Theoretical calculations using common PDF models can result in significant errors in prediction of performance metrics. In particular, these models do not consider the change in skewness of the distribution as the aperture size increases, and often positively skewed distributions (right tailed) are used to model scenarios where the true statistics are negatively skewed (left tailed). We evaluate the magnitude of errors in the prediction of bit-error rate and probability of fade based on simulation data for a collimated Gaussian beam in a realistic FSOC scenario for two strengths of turbulence and varying aperture sizes. The PDF models considered are lognormal, gamma–gamma, inverse-Gaussian-gamma, fractional exponential, exponentiated-Weibull, 3-parameter-Weibull, and normal distributions.

中文翻译：

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概率密度函数模型选择对强度调制直接探测自由空间光通信分析的影响

摘要。使用强度调制直接检测的自由空间光通信 (FSOC) 应用的平均误码率和衰落概率等性能指标理论上是基于描述辐照度波动的概率密度函数 (PDF) 计算出来的。使用常见 PDF 模型的理论计算可能会导致性能指标预测出现重大错误。特别是，这些模型没有考虑随着孔径大小的增加分布偏度的变化，并且通常使用正偏斜分布（右尾）来模拟真实统计数据呈负偏斜（左尾）的场景。我们根据模拟数据在实际 FSOC 场景中准直高斯光束的模拟数据来评估误码率和衰落概率预测中的误差幅度，其中两种强度的湍流和不同的孔径大小。考虑的 PDF 模型是对数正态分布、伽马伽马分布、逆高斯伽马分布、分数指数分布、指数威布尔分布、3 参数威布尔分布和正态分布。