Study on the Evaluation of Performance Objectives of Satellite Systems Using Adaptive Transmission

Recommendation S.2131, developed by the International Telecommunication Union - Radiocommunication (ITU-R), presents performance objective for the latest digital satellite communication systems using adaptive transmission techniques. One of the performance objectives specified in Recommendation ITU-R S.2131 is spectral efficiency as a function of signal to noise ratio. The Recommendation presents an example of estimating average spectral efficiency degradation by using a rain attenuation prediction model. The average value was estimated by assuming that the rain attenuation prediction model specified in Recommendation ITU-R P.618 is applicable to all time percentage of the year, even though it is defined for 5% or less time percentage of year. In the light of this, this paper presents the estimation results of degraded spectra efficiency of the year by using various assumptions of rain attenuation model. The estimation results presented in this paper can provide an insight to utilize the performance objectives specified in Recommendation ITU-R S.2131, and it also can be utilized to develop a new Recommendation on interference analysis between satellite networks.