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Can We Rely on Channel Hardening in Cell-Free Massive MIMO?
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
2017 (English)In: 2017 IEEE GLOBECOM WORKSHOPS (GC WKSHPS), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

Channel hardening makes fading multi-antenna channels behave as deterministic when there are many antennas. Massive MIMO systems utilize this phenomenon to deliver high and reliable performance from cellular access points. Recently, an alternative form of Massive MIMO has appeared: Cell-Free (CF) Massive MIMO. It is based on having many access points (APs) distributed over a large geographical area and these jointly serve all the users. Since the AP antennas are distributed, instead of co-located, it is not clear if these systems will inherit the channel hardening. In this paper, we use stochastic geometry to investigate this problem. Our results show that the amount of channel hardening is strongly affected by the number of antennas per AP and the propagation environment. To achieve channel hardening in CF Massive MIMO, it is beneficial to have multiple antennas per AP and a small path-loss exponent.

Place, publisher, year, edition, pages
IEEE , 2017.
Series
IEEE Globecom Workshops, ISSN 2166-0069
Keywords [en]
Cell-Free Massive MIMO; channel hardening; stochastic geometry
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:liu:diva-147208DOI: 10.1109/GLOCOMW.2017.8269162ISI: 000426984700131ISBN: 978-1-5386-3920-7 OAI: oai:DiVA.org:liu-147208DiVA, id: diva2:1197232
Conference
36th IEEE Global Communications Conference (GLOBECOM)
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF); CENIIT; ELLIIT

Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-04-12

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf