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Performance Analysis of Multi-User Massive MIMO Downlink Under Channel Non-Reciprocity and Imperfect CSI
Tampere Univ Technol, Finland.
Tampere Univ Technol, Finland.
Tech Univ Dresden, Germany.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-5954-434X
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2018 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 66, no 6, p. 2456-2471Article in journal (Refereed) Published
Abstract [en]

This paper analyzes the performance of linearly precoded time division duplex based multi-user massive MIMO downlink system under joint impacts of channel non-reciprocity (NRC) and imperfect channel state information. We consider a generic and realistic NRC model that accounts for transceiver frequency-response as well as mutual coupling mismatches at both user equipment (UE) and base station (BS) sides. The analysis covers two most prominent forms of linear precoding schemes, namely, zero-forcing (ZF) and maximum-ratio transmission (MRT), and assumes that only the statistical properties of the beamformed channel are used at the UE side to decode the received signal. Under the approximation of i.i.d. Gaussian channels, closed-form analytical expressions are derived for the effective signal to interference and noise ratios (SINRs) and the corresponding capacity lower bounds. The expressions show that, in moderate to high SNR, the additional interference caused by imperfect NRC calibration can degrade the performance of both precoders significantly. Moreover, ZF is shown to be more sensitive to NRC than MRT. Numerical evaluations with practical NRC levels indicate that this performance loss in the spectral efficiency can be as high as 42% for ZF, whereas it is typically less than 13% for MRT. It is also shown that due to the NRC, the asymptotic large-antenna performance of both precoders saturate to an identical finite level. The derived analytical expressions provide useful tools and valuable technical insight, e.g., into calculating the NRC calibration requirements in BSs and UEs for any given specific performance targets in terms of effective SINR or the system capacity bound.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2018. Vol. 66, no 6, p. 2456-2471
Keywords [en]
Capacity; channel reciprocity; frequency-response mismatch; inter-user interference; linear precoding; multi-user massive MIMO; mutual coupling; SINR
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-149535DOI: 10.1109/TCOMM.2018.2792017ISI: 000435225400012OAI: oai:DiVA.org:liu-149535DiVA, id: diva2:1231042
Note

Funding Agencies|Finnish Funding Agency for Technology and Innovation (Tekes) under the project "5th Evolution Take of Wireless Communication Networks (TAKE-5)"; Academy of Finland [284694, 288670]; TUT Graduate School

Available from: 2018-07-05 Created: 2018-07-05 Last updated: 2019-06-28

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