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Channel estimation and hybrid combining for wideband terahertz massive MIMO systems

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dc.contributor.author Dovelos, Konstantinos
dc.contributor.author Matthaiou, Michail
dc.contributor.author Ngo, Hien Quoc
dc.contributor.author Bellalta, Boris
dc.date.accessioned 2021-05-04T09:35:24Z
dc.date.issued 2021
dc.identifier.citation Dovelos K, Matthaiou M, Ngo HQ, Bellalta B. Channel estimation and hybrid combining for wideband terahertz massive MIMO systems. IEEE J Sel Areas Commun. 2021;39(6):1604-20. DOI: 10.1109/JSAC.2021.3071851
dc.identifier.issn 0733-8716
dc.identifier.uri http://hdl.handle.net/10230/47306
dc.description.abstract Terahertz (THz) communication is widely considered as a key enabler for future 6G wireless systems. However, THz links are subject to high propagation losses and inter-symbol interference due to the frequency selectivity of the channel. Massive multiple-input multiple-output (MIMO) along with orthogonal frequency division multiplexing (OFDM) can be used to deal with these problems. Nevertheless, when the propagation delay across the base station (BS) antenna array exceeds the symbol period, the spatial response of the BS array varies over the OFDM subcarriers. This phenomenon, known as beam squint, renders narrowband combining approaches ineffective. Additionally, channel estimation becomes challenging in the absence of combining gain during the training stage. In this work, we address the channel estimation and hybrid combining problems in wideband THz massive MIMO with uniform planar arrays. Specifically, we first introduce a low-complexity beam squint mitigation scheme based on true-time-delay. Next, we propose a novel variant of the popular orthogonal matching pursuit (OMP) algorithm to accurately estimate the channel with low training overhead. Our channel estimation and hybrid combining schemes are analyzed both theoretically and numerically. Moreover, the proposed schemes are extended to the multi-antenna user case. Simulation results are provided showcasing the performance gains offered by our design compared to standard narrowband combining and OMP-based channel estimation.
dc.description.sponsorship Manuscript received July 7, 2020; revised November 20, 2020, and February 12, 2021; accepted March 1, 2021. The work of K. Dovelos and B. Bellalta was supported by grants WINDMAL PGC2018-099959-B-I00 (MCIU/AEI/FEDER,UE), and SGR017-1188 (AGAUR). The work of M. Matthaiou was supported by the EPSRC, U.K., under Grant EP/P000673/1 and by a research grant from the Department for the Economy Northern Ireland under the US-Ireland R&D Partnership Programme. The work of H. Q. Ngo was supported by the U.K. Research and Innovation Future Leaders Fellowships under Grant MR/S017666/1.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Institute of Electrical and Electronics Engineers (IEEE)
dc.relation.ispartof IEEE Journal on Selected Areas in Communications. 2021;39(6):1604-20
dc.rights © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. http://dx.doi.org/10.1109/JSAC.2021.3071851
dc.title Channel estimation and hybrid combining for wideband terahertz massive MIMO systems
dc.type info:eu-repo/semantics/article
dc.identifier.doi http://dx.doi.org/10.1109/JSAC.2021.3071851
dc.subject.keyword Beam squint effect
dc.subject.keyword Compressive channel estimation
dc.subject.keyword Hybrid combining
dc.subject.keyword Massive MIMO
dc.subject.keyword Planar antenna arrays
dc.subject.keyword Wideband THz communication
dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/PGC2018-099959-B-I00
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.type.version info:eu-repo/semantics/acceptedVersion


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