Code-Domain NOMA in Massive MIMO: When Is It Needed?

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Le, Mai T. P.Univ Danang, Univ Sci & Technol, Da Nang 550000, Vietnam. (author)

Code-Domain NOMA in Massive MIMO : When Is It Needed?

Article/chapterEnglish2021

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Institute of Electrical and Electronics Engineers (IEEE),2021
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LIBRIS-ID:oai:DiVA.org:kth-298687
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298687URI
https://doi.org/10.1109/TVT.2021.3072409DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177864URI

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Language:English
Summary in:English

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QC 20210720
Funding Agencies|Vietnam Ministry of Education, and Training, Vietnam [B2021.DNA.01]; Italian Ministry of Education; MIURMinistry of Education, Universities and Research (MIUR); Swedish Research CouncilSwedish Research CouncilEuropean Commission [2019-05068]; Sapienza University of Rome Project [RP11816426A9F174]
In overloaded Massive MIMO (mMIMO) systems, wherein the number K of user equipments (UEs) exceeds the number of base station antennas M, it has recently been shown that non-orthogonal multiple access (NOMA) can increase the sum spectral efficiency. This paper aims at identifying cases where code-domain NOMA can improve the spectral efficiency of mMIMO in the classical regime where K < M. Novel spectral efficiency expressions are provided for the uplink and downlink with arbitrary spreading signatures and spatial correlation matrices. Particular attention is devoted to the planar arrays that are currently being deployed in pre-5G and 5G networks (in sub-6 GHz bands), which are characterized by limited spatial resolution. Numerical results show that mMIMO with such planar arrays can benefit from NOMA in scenarios where the UEs are spatially close to each other. A two-step UE grouping scheme is proposed for NOMA-aided mMIMO systems that is applicable to the spatial correlation matrices of the UEs that are currently active in each cell. Numerical results are used to investigate the performance of the algorithm under different operating conditions and types of spreading signatures (orthogonal, sparse and random sets). The analysis reveals that orthogonal signatures provide the highest average spectral efficiency.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Kommunikationssystem hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Communication Systems hsv//eng
Massive MIMO
uniform linear array
planar rectangular array
spatial correlation matrices
code-domain NOMA
spectral efficiency
channel estimation
arbitrary spreading signatures

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Sanguinetti, LucaUniv Pisa, Dipartimento Ingn Informaz, I-56122 Pisa, Italy. (author)
Björnson, Emil,Professor,1983-Linköpings universitet,KTH,Kommunikationssystem, CoS,Linköping Univ, Dept Elect Engn, S-58183 Linköping, Sweden.,Tekniska fakulteten,KTH Royal Inst Technol, Sweden(Swepub:liu)emibj29 (author)
Di Benedetto, Maria-GabriellaUniv Roma La Sapienza, I-00184 Rome, Italy. (author)
Univ Danang, Univ Sci & Technol, Da Nang 550000, Vietnam.Univ Pisa, Dipartimento Ingn Informaz, I-56122 Pisa, Italy. (creator_code:org_t)

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In:IEEE Transactions on Vehicular Technology: Institute of Electrical and Electronics Engineers (IEEE)70:5, s. 4709-47230018-95451939-9359

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