[en] The application of linear precoding at the gateway side enables broadband multibeam satellite systems to use more aggressive frequency reuse patterns increasing the overall capacity of future High Throughput Satellites (HTS). However, although some previous works about precoding consider imperfect CSIT (Chanel State Information at the Transmitter) adding some CSI estimation errors, that is not the main cause of CSI degradation. In practice, receivers can only detect and estimate a few coefficients of the CSI vector being the other nullified, replaced by zeros. This introduces errors in the SINR calculation by the gateway that lead to the assignment of Modulation and Coding Schemes (MCS) over the decoding possibilities of the users, increasing the rate of erroneous frames. In this work, the errors in the SINR calculation caused by the nullification of the CSI are analyzing statistically and geographically using a radiation diagram of 245 beams over Europe. Furthermore, a solution based on a link adaptation algorithm with a per user adaptive margin is proposed, helping to achieve the QEF (Quasi-error Free) target of DVB-S2X systems.
Disciplines :
Sciences informatiques
Auteur, co-auteur :
VUPPALA, Satyanarayana ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Sellathurai, Mathini
CHATZINOTAS, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
Optimal Deployment of Base Stations in Cognitive Satellite Terrestrial Networks
Date de publication/diffusion :
2018
Nom de la manifestation :
ITG Workshop on Smart Antennas (WSA 2018)
Lieu de la manifestation :
Bochum, Allemagne
Date de la manifestation :
10-09-2018 to 12-09-2018
Manifestation à portée :
International
Titre de l'ouvrage principal :
2018 9th Advanced Satellite Multimedia Systems Conference and the 15th Signal Processing for Space Communications Workshop (ASMS/SPSC)
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