لخّصلي

difference was nearly stable.In brief, diversity improvement factor is usually preferred by engineers whose design the terrestrial microwave links, where the diversity may be used to overcome the effect of multipath fading.However, the attenuation by precipitation and clouds for both models decreases as the elevation angle and the earth station height increases.As the frequency and the elevation angle increases the loss due to cross polarization increases too.

difference was nearly stable. However, the attenuation by precipitation and clouds for
both models decreases as the elevation angle and the earth station height increases.
Furthermore, both the SAM model an ITU-R model show that for high rain rate the
absorption increase.
As the frequency and the elevation angle increases the loss due to cross
polarization increases too. However, the loss decreases when the percentage of time
rainfall rate increases.
In brief, diversity improvement factor is usually preferred by engineers whose
design the terrestrial microwave links, where the diversity may be used to overcome
the effect of multipath fading. However, the diversity gain depends strongly on the
separation distance between stations. In practice, the diversity has not been widely
used in commercial satellite systems, because most systems are operating at frequency
range 4 to 6 GHz, where the effect of rain attenuation is negligible.