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Cell-Free Massive MIMO Versus Small Cells
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering. Queens Univ Belfast, Sch Elect Elect Engn & Comp Sci, Belfast BT3 9DT, Antrim, North Ireland.
Nokia Bell Labs, Murray Hill, NJ 07974 USA.
Nokia Bell Labs, NJ 07974 USA.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
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2017 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 3, p. 1834-1850Article in journal (Refereed) Published
Abstract [en]

A Cell-Free Massive MIMO (multiple-input multiple-output) system comprises a very large number of distributed access points (APs), which simultaneously serve a much smaller number of users over the same time/frequency resources based on directly measured channel characteristics. The APs and users have only one antenna each. The APs acquire channel state information through time-division duplex operation and the reception of uplink pilot signals transmitted by the users. The APs perform multiplexing/de-multiplexing through conjugate beamforming on the downlink and matched filtering on the uplink. Closed-form expressions for individual user uplink and downlink throughputs lead to max-min power control algorithms. Max-min power control ensures uniformly good service throughout the area of coverage. A pilot assignment algorithm helps to mitigate the effects of pilot contamination, but power control is far more important in that regard. Cell-Free Massive MIMO has considerably improved performance with respect to a conventional small-cell scheme, whereby each user is served by a dedicated AP, in terms of both 95%-likely per-user throughput and immunity to shadow fading spatial correlation. Under uncorrelated shadow fading conditions, the cell-free scheme provides nearly fivefold improvement in 95%-likely per-user throughput over the small-cell scheme, and tenfold improvement when shadow fading is correlated.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2017. Vol. 16, no 3, p. 1834-1850
Keywords [en]
Cell-Free Massive MIMO system; conjugate beamforming; massive MIMO; network MIMO; small cell
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-136047DOI: 10.1109/TWC.2017.2655515ISI: 000396404600036OAI: oai:DiVA.org:liu-136047DiVA, id: diva2:1084871
Note

Funding Agencies|Swedish Research Council; ELLIIT

Available from: 2017-03-27 Created: 2017-03-27 Last updated: 2017-11-29

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