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ITU-R REPORT S.2174

2010 Edition, July 1, 2010

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Guidelines that may be used in the design of satellite networks for assessing the impact of rain attenuation on the carrier to noise plus interference ratios of the FSS Plan allotments



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Introduction

In 2007, the World Radiocommunication Conference (WRC-07) adopted a revised FSS Plan (contained in Appendix 30B to the Radio Regulations), in which a number of technical parameters and criteria were modified. The above-mentioned Plan provides all ITU Members with protected orbital-frequency resources. In the FSS Plan, the criterion for the carrier-to-noise ratio (C/N) is defined under rain-faded conditions but the criterion for the carrier-to-interference (C/I) is defined in clear-sky conditions. In some cases, as a consequence of approved technical criteria and unavoidable signal attenuation due to rain, the energy balance of planned allotments in the 13/10-11 GHz frequency bands may become substantially worse.

All mathematical computations made in this Report are based on the assumption that the uplink power is designed to strictly achieve a C/N ratio of 21 dB under rain-faded conditions. It should be noted that test points of some allotments have higher faded C/N values in the uplink (i.e. greater than 21 dB).

Annex 1 to this Report provides supplementary information which examines two additional impacts of rain attenuation on system margin which are not taken into account by the FSS Plan. Annex 2 contains all the terms and their respective definitions used in the Report and in Annex 1.