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Showing posts from November, 2013

Satellite Frequencies - Consideration of Rain Fade and Antenna Size

As on above picture, on VSAT system, the higher the frequency, the smaller will be the antenna size. Against on it, more impact of rain attenuation suffered by the higher frequency (e.g Ka and Ku band) To mitigate of rain fade attenuation, there are some techniques ; - On Forward Link :      Use of DVB S-2 with Adaptive Coding and Modulation      Automatic Uplink Power Control (AUPC) - On Return Link :      Adaptive Coding      Symbol Rate Change      Automatic Uplink Power Control (AUPC)