Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems

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dc.authoridWaqas, Muhammad/0000-0003-0814-7544
dc.authoridTu, Shanshan/0000-0002-6220-4119
dc.contributor.authorMir, Talha
dc.contributor.authorWaqas, Muhammad
dc.contributor.authorMir, Usama
dc.contributor.authorHussain, Syed Mudassir
dc.contributor.authorElbir, Ahmet M.
dc.contributor.authorTu, Shanshan
dc.date.accessioned2021-12-01T18:50:11Z
dc.date.available2021-12-01T18:50:11Z
dc.date.issued2020
dc.department[Belirlenecek]en_US
dc.description.abstractHybrid precoding has emerged as a promising technique to reduce the hardware cost and complexity in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. However, due to the drastic increase in the number of user devices and higher data rate demand, new frequency bands (i.e., terahertz (THz) communications) are needed to explore. At THz frequencies, the precoding technique can provide a large beamforming gain, but still, the blockage and high path-loss remain a significant problem. To overcome the blockage problem, in this paper, we introduce the two-way relay design where the well-known two-way amplify-and-forward (AF) relay in THz-MIMO orthogonal frequency-division multiplexing (OFDM) systems is employed. The optimal two-way relay hybrid precoding problem is non-convex due to the practical hardware constraints (i.e., unit-modulus and block-diagonal constraints). To solve this problem, we first propose to use mathematical manipulations to remove the block-diagonal constraints from its analog part and then reformulate the original two-way relay hybrid precoding problem into a quadratic-convex problem with only power constraint. Finally, we obtain the closed-form solution for the two-way relay hybrid precoding problem. Simulation results reveal that our proposed solution can achieve better sum-rate and energy efficiency than existing hybrid schemes.en_US
dc.description.sponsorshipChina National Key Research and Development Program [2018YFB0803600]; Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [61801008]; Scientific Research Common Program of Beijing Municipal Commission of EducationBeijing Municipal Commission of Education [KM201910005025]; Chinese Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2020M670074]en_US
dc.description.sponsorshipThis work was supported in parts by the China National Key Research and Development Program under Grant 2018YFB0803600, the Natural Science Foundation of China under Grant 61801008, the Scientific Research Common Program of Beijing Municipal Commission of Education under Grant KM201910005025, and the Chinese Postdoctoral Science Foundation under Grant 2020M670074.en_US
dc.identifier.doi10.1109/ACCESS.2020.3044907
dc.identifier.endpage222671en_US
dc.identifier.issn2169-3536
dc.identifier.scopus2-s2.0-85098334509en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage222660en_US
dc.identifier.urihttps://doi.org/10.1109/ACCESS.2020.3044907
dc.identifier.urihttps://hdl.handle.net/20.500.12684/10839
dc.identifier.volume8en_US
dc.identifier.wosWOS:000603715900001en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherIeee-Inst Electrical Electronics Engineers Incen_US
dc.relation.ispartofIeee Accessen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectTerahertz communicationsen_US
dc.subjectmassive MIMOen_US
dc.subjecthybrid precodingen_US
dc.subjecttwo-way relayen_US
dc.subjectChannel Estimationen_US
dc.subjectCombineren_US
dc.subjectArraysen_US
dc.titleHybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systemsen_US
dc.typeArticleen_US

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