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dc.contributor.authorThet, Nann Win Moe
dc.contributor.authorKhan, Sana
dc.contributor.authorArvas, Ercüment
dc.contributor.authorÖzdemir, Mehmet Kemal
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.
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.en_US
dc.publisherIEEE-Institute of Electrical and Electronics Engineers Incen_US
dc.rightsAttribution 4.0 International*
dc.subjectMutual Couplingen_US
dc.subjectThree-Dimensional Displaysen_US
dc.subjectArray Signal Processingen_US
dc.subjectLinear Antenna Arraysen_US
dc.subjectSymmetric Matricesen_US
dc.subjectNon-Orthogonal Multiple Access (NOMA)en_US
dc.subjectMulti-User Beamformingen_US
dc.subjectMillimeter Waveen_US
dc.subjectMutual Coupling (MC)en_US
dc.subjectUniform Linear Array (ULA)en_US
dc.subjectUniform Circular Array (UCA)en_US
dc.subject3D UCAen_US
dc.titleImpact of mutual coupling on power-domain non-orthogonal multiple access (NOMA)en_US
dc.relation.journalIEEE Accessen_US
dc.departmentİstanbul Medipol Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümüen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US

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