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No Downlink Pilots Are Needed in TDD Massive MIMO
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
2017 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 5, 2921-2935 p.Article in journal (Refereed) Published
Abstract [en]

We consider the Massive Multiple-Input MultipleOutput downlink with maximum-ratio and zero-forcing processing and time-division duplex operation. To decode, the users must know their instantaneous effective channel gain. Conventionally, it is assumed that by virtue of channel hardening, this instantaneous gain is close to its average and hence that users can rely on knowledge of that average (also known as statistical channel information). However, in some propagation environments, such as keyhole channels, channel hardening does not hold. We propose a blind algorithm to estimate the effective channel gain at each user, that does not require any downlink pilots. We derive a capacity lower bound of each user for our proposed scheme, applicable to any propagation channel. Compared with the case of no downlink pilots (relying on channel hardening), and compared with training-based estimation using downlink pilots, our blind algorithm performs significantly better. The difference is especially pronounced in environments that do not offer channel hardening.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2017. Vol. 16, no 5, 2921-2935 p.
Keyword [en]
Blind channel estimation; downlink; keyhole channels; massive MIMO; maximum-ratio processing; time-division duplexing; zero-forcing processing
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-138271DOI: 10.1109/TWC.2017.2672540ISI: 000401083800015OAI: oai:DiVA.org:liu-138271DiVA: diva2:1109111
Note

Funding Agencies|Swedish Research Council (VR); Swedish Foundation for Strategic Research; ELLIIT

Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2017-06-13

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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