Abstract
In this paper, the effects of the generalized exponent, the height and the zenith angle on the log-amplitude variance in the weak fluctuation are investigated. The theoretical results indicate that for the downlink, the log-amplitude variance of the Kolmogorov model is always smaller than that of the three-layer model, while for the uplink, there is a point of intersection in the log-amplitude variance curves of the two models. The different phenomena for the downlink and uplink are analyzed in detail. Further, we find a method to ascertain precise values of the boundary layer altitudes for the three-layer model under various atmospheric conditions through the analysis for the point of intersection. And at the point of intersection, the Kolmogorov model can be used to replace the three-layer model to simplify the analysis of the system performance. Moreover, the log-amplitude variance increases with the increase of the zenith angle.
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