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dc.contributor.authorPapazafeiropoulos, A.
dc.contributor.authorNgo, H. Q.
dc.contributor.authorKourtessis, P.
dc.contributor.authorChatzinotas, S.
dc.contributor.authorSenior, J. M.
dc.date.accessioned2021-05-06T07:48:14Z
dc.date.available2021-05-06T07:48:14Z
dc.date.issued2021-02-12
dc.identifier.citationPapazafeiropoulos , A , Ngo , H Q , Kourtessis , P , Chatzinotas , S & Senior , J M 2021 , ' Towards Optimal Energy Efficiency in Cell-Free Massive MIMO Systems ' , IEEE Transactions on Green Communications and Networking . https://doi.org/10.1109/TGCN.2021.3059206
dc.identifier.issn2473-2400
dc.identifier.otherPURE: 19514065
dc.identifier.otherPURE UUID: 77a222d0-3eb0-4fa3-bddb-a026bb14f6fa
dc.identifier.otherScopus: 85100844743
dc.identifier.otherORCID: /0000-0003-1841-6461/work/93471213
dc.identifier.urihttp://hdl.handle.net/2299/24416
dc.description© 2021 IEEE - This is the accepted manuscript version of an article which has been published in final form at https://dx.doi.org/10.1109/TGCN.2021.3059206
dc.description.abstractMotivated by the ever-growing demand for green wireless communications and the advantages of cell-free (CF) massive multiple-input multiple-output (mMIMO) systems, we focus on the design of their downlink (DL) for optimal energy efficiency (EE). To address this fundamental topic, we assume that each access point (AP) is deployed with multiple antennas and serves multiple users on the same time-frequency resource while the APs are Poisson point process (PPP) distributed, which approaches realistically their opportunistic spatial randomness. Relied on tools from stochastic geometry, we derive a lower bound on the DL average achievable spectral efficiency (SE). Next, we consider a realistic power consumption model for CF mMIMO systems. These steps enable the formulation of a tractable optimization problem concerning the DL EE, which results in the analytical determination of the optimal pilot reuse factor, the AP density, and the number of AP antennas and users that maximize the EE. Hence, we provide useful design guidelines for CF mMIMO systems relating to fundamental system variables towards optimal EE. Among the results, we observe that an optimal pilot reuse factor and AP density exist, while larger values result in an increase of the interference, and subsequently, lower EE. Overall, it is shown that the CF mMIMO technology is a promising candidate for next-generation networks achieving simultaneously high SE and EE.en
dc.format.extent15
dc.language.isoeng
dc.relation.ispartofIEEE Transactions on Green Communications and Networking
dc.subjectbeyond 5G MIMO.
dc.subjectCell-free massive MIMO systems
dc.subjectenergy efficiency
dc.subjectsmall cells networks
dc.subjectstochastic geometry
dc.subjectRenewable Energy, Sustainability and the Environment
dc.subjectComputer Networks and Communications
dc.titleTowards Optimal Energy Efficiency in Cell-Free Massive MIMO Systemsen
dc.contributor.institutionUniversity of Hertfordshire
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85100844743&partnerID=8YFLogxK
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1109/TGCN.2021.3059206
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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