Coded slotted aloha with multipacket reception over block fading channels (for satellite networks)

Mambelli, Iacopo (2015) Coded slotted aloha with multipacket reception over block fading channels (for satellite networks). [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria elettronica e telecomunicazioni per lo sviluppo sostenibile [LM-DM270] - Cesena
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Random access (RA) protocols are normally used in a satellite networks for initial terminal access and are particularly effective since no coordination is required. On the other hand, contention resolution diversity slotted Aloha (CRDSA), irregular repetition slotted Aloha (IRSA) and coded slotted Aloha (CSA) has shown to be more efficient than classic RA schemes as slotted Aloha, and can be exploited also when short packets transmissions are done over a shared medium. In particular, they relies on burst repetition and on successive interference cancellation (SIC) applied at the receiver. The SIC process can be well described using a bipartite graph representation and exploiting tools used for analyze iterative decoding. The scope of my Master Thesis has been to described the performance of such RA protocols when the Rayleigh fading is taken into account. In this context, each user has the ability to correctly decode a packet also in presence of collision and when SIC is considered this may result in multi-packet reception. Analysis of the SIC procedure under Rayleigh fading has been analytically derived for the asymptotic case (infinite frame length), helping the analysis of both throughput and packet loss rates. An upper bound of the achievable performance has been analytically obtained. It can be show that in particular channel conditions the throughput of the system can be greater than one packets per slot which is the theoretical limit of the Collision Channel case.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Mambelli, Iacopo
Relatore della tesi
Correlatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
RA, IC, bipartite, graph, IRSA, Rayleigh, fading
Data di discussione della Tesi
19 Marzo 2015

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