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Reciprocity Aided CSI Feedback for 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.ORCID iD: 0000-0002-5954-434X
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
2020 (English)In: 2020 54TH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS, AND COMPUTERS, IEEE , 2020, p. 1022-1027Conference paper, Published paper (Refereed)
Abstract [en]

A potential showstopper for reciprocity-based beamforming is that the uplink SNR often is much smaller than the downlink SNR, making it hard to estimate channels on the uplink. We analyze this problem by considering a "grid-of-beams world" with a finite number of possible channel realizations. We assume that the terminal can accurately detect the channel and we propose a method of improving the channel detection from uplink pilots by designing a mapping between the channel and the pilots. We find a simple metric that is to be minimized to maximize performance. Further, we propose an algorithm that draws pilot sequences from a distribution aimed to minimize the metric. We see that we can come close to optimal performance, which requires long sequences, with significantly shorter sequences.

Place, publisher, year, edition, pages
IEEE , 2020. p. 1022-1027
Series
Conference Record of the Asilomar Conference on Signals Systems and Computers, ISSN 1058-6393
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:liu:diva-178991DOI: 10.1109/IEEECONF51394.2020.9443389ISI: 000681731800197ISBN: 9780738131269 (print)OAI: oai:DiVA.org:liu-178991DiVA, id: diva2:1591810
Conference
54th Asilomar Conference on Signals, Systems, and Computers, ELECTR NETWORK, nov 01-05, 2020
Available from: 2021-09-07 Created: 2021-09-07 Last updated: 2021-09-07

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Becirovic, EmaBjörnson, EmilLarsson, Erik G
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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