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BER performance improvement of FSO links with aperture averaging and receiver diversity technique under various atmospheric conditions

机译：在各种大气条件下，通过孔径平均和接收机分集技术提高FSO链路的BER性能

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The performance of terrestrial free space optical (FSO) links is degraded by the presence of atmospheric turbulence and weather conditions. In this paper, it is proposed to evaluate the bit error rate (BER) of a FSO link by modeling the turbulence as a gamma-gamma distribution and incorporating the effect of weather by the Beer-Lambert's law. Results show that BER increases as the turbulence strength goes from weak to strong. The presence of weather conditions such as fog, haze, drizzle, etc., cause a degradation in the link performance, with fog having the worst effect followed by haze, drizzle and very clear weather conditions over all turbulence regimes. Further, the performance enhancement brought about by using receiver diversity schemes, namely aperture averaging and array receivers is studied and compared. With an increase in the aperture diameter, BER decreases irrespective of the turbulence strength and weather conditions. Also, as the number of direct detection receivers in the array are increased, BER decreases. However, it is seen that in strong turbulence regime or in presence of fog, diversity receivers become the preferred choice in comparison to the aperture averaging technique.
机译：大气湍流和天气条件的存在会降低地面自由空间光（FSO）链路的性能。在本文中，提出了通过将湍流建模为伽玛-伽玛分布并根据比尔-兰伯特定律纳入天气影响来评估FSO链路的误码率（BER）。结果表明，BER随湍流强度从弱变强而增加。天气条件（如雾，霾，毛毛雨等）的存在会导致链路性能下降，在所有湍流范围内，雾的影响最差，其次是霾，毛毛雨和非常晴朗的天气条件。此外，研究并比较了使用接收器分集方案（即孔径平均和阵列接收器）带来的性能增强。随着孔径的增加，BER减小，而与湍流强度和天气条件无关。而且，随着阵列中直接检测接收器的数量增加，BER降低。但是，可以看出，在强湍流条件下或在有雾的情况下，与孔径平均技术相比，分集接收器成为首选。

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