RESEARCH ON RAIN FADE ATTENUATION AT INDIAN REGION BY FADE MITIGATION TECHNIQUES

Author’s Name : Y Ravi sekhar | Dr T V Ramana

Volume 02 Issue 02  Year 2015  ISSN No:  2349-252X  Page no: 5-6

Abstract -Rain attenuation is by far the most important of losses for frequencies above 10 GHz, because it can cause the largest attenuation and is usually, therefore, the limiting factor at Ku-band satellite link design. Rain rate distribution is one of the most important factors for calculating rainfall attenuation at a specific location. The most effective way of obtaining the cumulative rainfall distribution is through direct measurement. However due to the shortage of the required rainfall data at certain locations, rainfall models need to be introduced to predict the rainfall rate and attenuation distribution at location of interest. Making use of Fade Mitigation Techniques involves adapting in real time the link budget to the propagation conditions. These FMT rely on the principles of Up-Link Power Control, Data Rate Reduction and Adaptive Coding. ULPC is used to keep a constant level of all the carriers at the input of the repeater, while maintaining the uplink budget close to target.  Use of FMTs enables the system to cope with important fades and therefore to comply with the required availability.

Keywords –Rain Attenuation; Satellite Link design; Power Control