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Uplink Performance of Cell-Free Massive MIMO Over Spatially Correlated Rician Fading Channels
Beijing Jiaotong Univ, Peoples R China.
Beijing Jiaotong Univ, Peoples R China.
Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem. Linköpings universitet, Tekniska fakulteten. KTH Royal Inst Technol, Sweden.ORCID-id: 0000-0002-5954-434X
Beijing Jiaotong Univ, Peoples R China; Zhengzhou Univ, Peoples R China.
2021 (Engelska)Ingår i: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 25, nr 4, s. 1348-1352Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We consider a practical cell-free massive multiple-input-multiple-output (MIMO) system with multi-antenna access points (APs) and spatially correlated Rician fading channels. The significant phase-shift of the line-of-sight component induced by the user equipment movement is modeled randomly. Furthermore, we investigate the uplink spectral efficiency (SE) with maximum ratio (MR)/local minimum mean squared error (L-MMSE) combining and optimal large-scale fading decoding based on the phase-aware MMSE, phase-aware element-wise MMSE and linear MMSE (LMMSE) estimators. Then new closed-form SE expressions with MR combining are derived. Numerical results validate our derived expressions and show that the SE benefits from the spatial correlation. It is important to observe that the performance gap between L-MMSE and MR combining increases with the number of antennas per AP and the SE of the LMMSE estimator is lower than that of other estimators due to the lack of phase-shifts knowledge.

Ort, förlag, år, upplaga, sidor
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2021. Vol. 25, nr 4, s. 1348-1352
Nyckelord [en]
Rician channels; Channel estimation; Fading channels; Coherence; Partial transmit sequences; Correlation; Uplink; Cell-free massive MIMO; spatially correlated rician fading; phase-shift; spectral efficiency
Nationell ämneskategori
Signalbehandling
Identifikatorer
URN: urn:nbn:se:liu:diva-175793DOI: 10.1109/LCOMM.2020.3041899ISI: 000639708000063OAI: oai:DiVA.org:liu-175793DiVA, id: diva2:1556791
Anmärkning

Funding Agencies|Science and Technology Key Project of Guangdong Province China [2019B010157001]; Royal Society Newton Advanced Fellowship [NA191006]; State Key Lab of Rail Traffic Control and Safety [RCS2018ZZ007, RCS2019ZZ007]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [61971027, U1834210, 61961130391]; Beijing Natural Science FoundationBeijing Natural Science Foundation [L202013]; ZTE Corporation; State Key Laboratory of Mobile Network and Mobile Multimedia Technology; Swedish Research CouncilSwedish Research CouncilEuropean Commission

Tillgänglig från: 2021-05-24 Skapad: 2021-05-24 Senast uppdaterad: 2021-05-24

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