A Multi-Replica Decoding Technique for Contention Resolution Diversity Slotted Aloha

Huyen Chi Bui (1, 2) , Karine Zidane (3) , Jérôme Lacan (1, 2) , Marie-Laure Boucheret (4, 5)

1 ISAE-SUPAERO - Institut Supérieur de l'Aéronautique et de l'Espace
2 TéSA - Télécommunications Spatiales et Aéronautiques - Telecommunications for Space ant Aeronautics
3 Chercheur indépendant
4 IRIT-SC - Signal et Communications
5 Toulouse INP - Institut National Polytechnique (Toulouse)

This paper proposes a new method for data reception over a random access channel in a satellite communication system. The method is called Multi-replicA decoding using corRelation baSed locALisAtion (MARSALA). It uses the same transmission scheme as in Contention Resolution Diversity Slotted Aloha (CRDSA) where each user sends several replicas of the same packet over the frame. MARSALA is a new decoding technique that localises all the replicas of a packet using a correlation based method, then combines them to decode the data. With MARSALA, the system can achieve a normalized throughput higher than 1.2, resulting in a significant gain compared to CRDSA, while adding a relatively low implementation complexity at the receiver. We also highlight on the practical issues related to channel estimation and how to perform coherent signal combination in MARSALA.

Mots clés: Receivers; Correlation; Niobium; Decoding; Throughput; Channel estimation; Interference cancellation

Domaines: Synthèse d'image et réalité virtuelle [cs.GR]; Traitement du signal et de l'image [eess.SP]; Traitement des images [eess.IV]; Vision par ordinateur et reconnaissance de formes [cs.CV]; Intelligence artificielle [cs.AI]

Huyen Chi Bui, Karine Zidane, Jérôme Lacan, Marie-Laure Boucheret. A Multi-Replica Decoding Technique for Contention Resolution Diversity Slotted Aloha. 82nd IEEE Vehicular Technology Conference (VTC Fall 2015), Sep 2015, Boston, United States. pp. 1-5. ⟨hal-01466629⟩