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Unsourced multiple access with random user activity

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dc.affiliation.dptoUC3M. Departamento de Teoría de la Señal y Comunicacioneses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Tratamiento de la Señal y Aprendizaje (GTSA)es
dc.contributor.authorNgo, K. Hoang
dc.contributor.authorLancho Serrano, Alejandro
dc.contributor.authorGiuseppe, Durisi
dc.contributor.authorGraell I Amat, Alexandre
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2023-09-18T12:26:07Z
dc.date.available2023-09-18T12:26:07Z
dc.date.issued2023-07
dc.description.abstractTo account for the massive uncoordinated random access scenario, which is relevant for the Internet of Things, Polyanskiy et al. (2017) proposed a novel formulation of the multiple-access problem, commonly referred to as unsourced multiple access, where all users employ a common codebook and the receiver decodes up to a permutation of the messages. In this paper, we extend this seminal work to the case where the number of active users is random and unknown a priori . We define a random-access code accounting for both misdetection (MD) and false alarm (FA), and derive a random-coding achievability bound for the Gaussian multiple access channel. Our bound captures the fundamental trade-off between MD and FA probabilities. It suggests that the lack of knowledge of the number of active users entails a small penalty in energy efficiency when the target MD and FA probabilities are high. However, as the target MD and FA probabilities decrease, the energy efficiency penalty becomes more significant. For example, in a typical IoT scenario with framelength 19200 complex channel uses and 25-300 active users in average, the required energy per bit to achieve both MD and FA probabilities below $10^{-1}$ , predicted by our bound, is only 0.5-;0.7 dB higher than that predicted by the bound in Polyanskiy et al. (2017) for a known number of active users. This gap increases to 3-4 dB when the target MD probability and/or FA probability is below $10^{-3}$ . Taking both MD and FA into account, we use our bound to benchmark the energy efficiency of slotted-ALOHA with multi-packet reception, of a decoder that simply treats interference as noise, and of some recently proposed unsourced multiple access schemes. Numerical results suggest that, when the target MD and FA probabilities are high, it is effective to estimate the number of active users, then treat this estimate as the true value, and use a coding scheme that performs well for the case of known number of active users. However, this approach becomes energy inefficient when the requirements on MD and FA probabilities are stringent.en
dc.description.sponsorshipAn earlier version of this paper was presented in part at the IEEE International Symposium on Information Theory (ISIT), Melbourne, VI, Australia, July 2021.en
dc.format.extent22
dc.identifier.bibliographicCitationNgo, K. H., Lancho, A., Durisi, G., & Graell I Amat, A. (2023). Unsourced multiple access with random user activity. IEEE Transactions on Information Theory, 69(7), 4537-4558.en
dc.identifier.doihttps://doi.org/10.1109/TIT.2023.3248967
dc.identifier.issn0018-9448
dc.identifier.publicationfirstpage4537
dc.identifier.publicationissue7
dc.identifier.publicationlastpage4558
dc.identifier.publicationtitleIEEE Transactions on Information Theoryen
dc.identifier.publicationvolume69
dc.identifier.urihttps://hdl.handle.net/10016/38367
dc.identifier.uxxiAR/0000033307
dc.language.isoengen
dc.publisherIEEEen
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/101024432es
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/101022113es
dc.rights© 2023 IEEE.es
dc.rights.accessRightsopen accessen
dc.subject.ecienciaElectrónicaes
dc.subject.ecienciaTelecomunicacioneses
dc.subject.otherMultiple-access channelsen
dc.subject.otherUnsourced multiple accessen
dc.subject.otherRandom-coding bounden
dc.subject.otherMisdetectionen
dc.subject.otherFalse alarmen
dc.titleUnsourced multiple access with random user activityen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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