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Site diversity
Site diversity is a technique to limit the effect of rain fade in satellite communications, mainly in the Ka band. The downlink transmissions of satellites cover very large areas, that will have different weather. The site diversity technique consists of linking two or more ground stations receiving the same signal: this way, if the signal is heavily attenuated in one area, another ground stations can compensate it. These intense rain areas, for example supercells, often have a horizontal length of no more than a few kilometres: putting the ground stations at a sufficient distance the possibility of rain fade in the downlink signal will be reduced.
The configuration works when the attenuation is not great at the two stations simultaneously. This is usually a valid assumption. Site diversity systems have been known to minimize disruption of service by major satellite carriers.
==See also==
*Diversity scheme
*Diversity combining
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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