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Protograph LDPC Code Design for Asynchronous Random Access

Clazzer, Federico and Matuz, Balazs and Jayasooriya, Sachini and Shirvanimoghaddam, Mahyar and Johnson, Sarah J. (2019) Protograph LDPC Code Design for Asynchronous Random Access. Algorithms, 12 (8-170), pp. 1-23. Multidisciplinary Digital Publishing Institute (MDPI). ISSN 1999-4893

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Abstract

This work addresses the physical layer channel code design for an uncoordinated, frame and Slot asynchronous random access protocol. Starting from the observation that collisions between two users yield very specific interference patterns, we define a surrogate channel model and propose different protograph low density parity check code designs. The proposed codes are both tested in a setup where the physical layer is abstracted, as well as on a more realistic channel model, where finite length physical layer simulations of the entire asynchronous random access scheme, including decoding, are carried out. We find that the abstracted physical layer model overestimates the performance when short blocks are considered. Additionally, the optimized codes show gains in supported channel traffic, a measure of the number of terminals that can be concurrently accommodated on the channel, of around 17% at a packet loss rate of 10 minus 2 w.r.t. off-the shelf codes.

Item URL in elib:https://elib.dlr.de/128986/
Document Type:Article
Title:Protograph LDPC Code Design for Asynchronous Random Access
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Clazzer, Federicofederico.clazzer (at) dlr.deUNSPECIFIED
Matuz, BalazsBalazs.Matuz (at) dlr.deUNSPECIFIED
Jayasooriya, Sachinisachini.jayasooriya (at) newcastle.edu.auUNSPECIFIED
Shirvanimoghaddam, Mahyarmahyar.shirvanimoghaddam (at) sydney.edu.auUNSPECIFIED
Johnson, Sarah J.sarah.johnson (at) newcastle.edu.auUNSPECIFIED
Date:15 August 2019
Journal or Publication Title:Algorithms
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:12
Page Range:pp. 1-23
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1999-4893
Status:Published
Keywords:medium access control, grant free access, unequal error protection, successive interference cancellation, physical layer simulations, quantized density Evolution, Gaussian interference channel
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Multimedia Satellitennetze
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Clazzer, Federico
Deposited On:24 Sep 2019 15:14
Last Modified:14 Dec 2019 04:25

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