Impact of mutual coupling on power-domain non-orthogonal multiple access (NOMA)

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dc.authorid0000-0002-9193-1374
dc.authorid0000-0002-9054-0005
dc.contributor.authorThet, Nann Win Moe
dc.contributor.authorKhan, Sana
dc.contributor.authorArvas, Ercüment
dc.contributor.authorÖzdemir, Mehmet Kemal
dc.date.accessioned2020-11-20T05:53:42Z
dc.date.available2020-11-20T05:53:42Z
dc.date.issued2020
dc.departmentİstanbul Medipol Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü
dc.description.abstractThis paper investigates the impact of mutual coupling (MC) on the achievable sum-rate of power-domain non-orthogonal multiple access (NOMA) system in both uplink (UL) and downlink (DL) transmissions. We assume a single-antenna user NOMA system with directional beamforming in the millimeter wave (mmW) channel. Due to the electromagnetic interaction between the antenna elements, called mutual coupling, at the base station (BS), the steering vector of the channel is affected. Consequently, this leads to distorted antenna pattern pointing towards different directions and reduction in channel gain, based on antenna array structure. In this paper, different antenna geometries and configurations, such as one-dimensional (1D) uniform linear array (ULA), two-dimensional (2D), and three-dimensional (3D) uniform circular array (UCA), are implemented at the BS, where induced electromotive force (EMF) and method of moment (MOM) techniques are used to generate the MC coefficients. We first examine the antenna patterns affected by MC, followed by channel gains of user terminals (UT)s. Then sum-rate of the NOMA system is modified in the presence of MC. Furthermore, mutual coupling is compensated successfully for both UL and DL systems for the given antenna structures. Simulation results show that mutual coupling degrades the sum-rate performance of the NOMA system in all three array structures, especially in the UCA structure due to the smaller spacing of the array element in a circular shape, resulting in symmetric mutual coupling from both sides of the circle. On the other hand, it is also shown that compensating the mutual coupling effect by the MOM technique in the case of unknown MC or matrix inversion in the case of known MC significantly improves the system sum-rate in all scenarios.
dc.identifier.citationThet, N. W. M., Khan, S., Arvas, E. ve Özdemir, M. K. (2020). Impact of mutual coupling on power-domain non-orthogonal multiple access (NOMA). IEEE Access, 8, 188401-188414. https://dx.doi.org/10.1109/ACCESS.2020.3030110
dc.identifier.doi10.1109/ACCESS.2020.3030110
dc.identifier.endpage188414
dc.identifier.issn2169-3536
dc.identifier.scopusqualityQ1
dc.identifier.startpage188401
dc.identifier.urihttps://dx.doi.org/10.1109/ACCESS.2020.3030110
dc.identifier.urihttps://hdl.handle.net/20.500.12511/6034
dc.identifier.volume8
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherIEEE-Institute of Electrical and Electronics Engineers Inc
dc.relation.ecinfo:eu-repo/grantAgreement/TUBITAK/SOBAG/215E316
dc.relation.ecinfo:eu-repo/grantAgreement/TUBITAK/SOBAG/2215
dc.relation.ispartofIEEE Accessen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsAttribution 4.0 International*
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.subjectNOMA
dc.subjectMutual Coupling
dc.subjectThree-Dimensional Displays
dc.subjectArray Signal Processing
dc.subjectLinear Antenna Arrays
dc.subjectSymmetric Matrices
dc.subjectNon-Orthogonal Multiple Access (NOMA)
dc.subjectMulti-User Beamforming
dc.subjectMillimeter Wave
dc.subjectSum-Rate
dc.subjectMutual Coupling (MC)
dc.subjectUniform Linear Array (ULA)
dc.subjectUniform Circular Array (UCA)
dc.subject3D UCA
dc.titleImpact of mutual coupling on power-domain non-orthogonal multiple access (NOMA)
dc.typeArticle

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