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Spatially-Coupled Random Access on Graphs

Liva, Gianluigi and Paolini, Enrico and Lentmaier, Michael and Chiani, Marco (2012) Spatially-Coupled Random Access on Graphs. IEEE International Symposium on Information Theory, Boston, US.

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Abstract

In this paper we investigate the effect of spatial coupling applied to the recently-proposed coded slotted ALOHA (CSA) random access protocol. Thanks to the bridge between the graphical model describing the iterative interference cancelation process of CSA over the random access frame and the erasure recovery process of low-density parity-check (LDPC) codes over the binary erasure channel (BEC), we propose an access protocol which is inspired by the convolutional LDPC code construction. The proposed protocol exploits the terminations of its graphical model to achieve the spatial coupling effect, attaining performance close to the theoretical limits of CSA. As for the convolutional LDPC code case, large iterative decoding thresholds are obtained by simply increasing the density of the graph. We show that the threshold saturation effect takes place by defining a suitable counterpart of the maximum-a-posteriori decoding threshold of spatially-coupled LDPC code ensembles. In the asymptotic setting, the proposed scheme allows sustaining a traffic close to 1 [packets/slot].

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Spatially-Coupled Random Access on Graphs
Authors:
AuthorsInstitution or Email of Authors
Liva, GianluigiDLR
Paolini, EnricoUniv. of Bologna
Lentmaier, MichaelUniv. of Dresden
Chiani, MarcoUniv. of Bologna
Date:February 2012
Status:Published
Keywords:Random Access, Spatial Coupling, Interference Cancelation, ALOHA
Event Title:IEEE International Symposium on Information Theory
Event Location:Boston, US
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Digital Networks
Deposited By: Dr. Gianluigi Liva
Deposited On:23 May 2012 10:51
Last Modified:06 Feb 2013 10:53

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