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Vidal Barba, Oriol (2014)
Languages: English
Types: Article
Subjects: Satellite, Multifaisceaux, THD, Interférences, Précodage, MIMO, Réutilisation fréquentielle, 621.382 2, Broadband, HTS, Interferences, Precoding, Frequency reuse
Cette thèse à pour but d'étudier des alternatives à l’augmentation des faisceaux dans des systèmes satellite THD de prochaine génération, évaluant des stratégies pour augmenter de manière significative la capacité totale du système. Dans ce contexte, les schémas de réutilisation de fréquence (FR) agressives viennent naturellement dans l'esprit afin d'augmenter les ressources globales en bande passante et, par conséquent, augmenter la capacité globale du système. Cependant, ces schémas mènent à une augmentation des interférences co-canal, rendant l'utilisation du spectre supplémentaire pas tellement efficace. Visant à trouver une solution à ce défi, des techniques basées sur des interférences ont été évaluées dans un contexte satellitaire réaliste, correspondant au précodage linéaire et la réutilisation fréquentielle fractionnelle (FFR). Le précodage linéaire est une technique MIMO qui permet l’application des schémas de réutilisation plus agressifs en traitant conjointement les signaux transmis afin de pré-compenser les interférences co-canal. Cette technique a été étudiée dans le cadre des systèmes THD et sa performance dérivé en considérant une caractérisation réaliste antenne, prouvant l'importante amélioration dans la capacité totale du système. Des stratégies de scheduling ont été également étudiées et des algorithmes évalués, prouvant que d'autres améliorations peuvent être réalisées considérant mécanismes intelligents de scheduling. Une autre voie d'augmenter les ressources spectrales par faisceau a été étudiée considérant des schémas FFR, utilisés en grande partie dans les réseaux mobiles terrestres (c.-à-d. WiMax, LTE…). The purpose of this Ph.D. thesis has been to investigate alternatives to the beam scaling in NG-HTS systems, assessing advanced strategies to significantly increase total system capacity, without further exploding the number of beams. In this context, aggressive frequency reutilization (FR) strategies come naturally into mind as a potential mean to increase overall bandwidth resources and therefore, boost system capacity. However, it leads to an increase on co-channel interferences, rendering the usage of additional spectrum not as efficient. Aiming to find a solution to this challenge, advanced interference-based system techniques have been assessed in a realistic NG-HTS context, corresponding to Linear Precoding and Fractional FR (FFR) schemes. Linear Precoding is a MIMO-based technique which allows considering more aggressive FR schemes by jointly processing the transmitted signals in order to pre-compensate co-channel interferences. This technique has been studied in the frame of NG-HTS systems and their performances derived considering realistic antenna characterization, proving significant improvement in total system capacity. Scheduling strategies have been also investigated and schedule algorithms assessed, showing further improvements can be achieved considering smart scheduling mechanisms. Another way to increase spectral resources per beam has been then investigated considering FFR schemes, used mostly in mobile terrestrial networks (i.e. WiMAX, LTE…). FFR scheme application has been characterized and adapted to the particularities of a realistic HTS satellite context and its gains in total capacity have been derived. A natural synergy between Linear Precoding and FFR has been then studied, leading to further improvements on total system capacity.
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