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Greedy User Selection for Zero-forcing and MMSE Multiuser Beamforming with Channel Estimation Errors
Royal Institute of Technology (KTH), Stockholm, Sweden.
Royal Institute of Technology (KTH), Stockholm, Sweden.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7599-4367
2008 (English)In: Proceedings of the 33rd IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'08), IEEE , 2008, 3137-3140 p.Conference paper, Published paper (Refereed)
Abstract [en]

In a multi-user MIMO downlink where the base station has only estimates of the channels of the users, the sum-rate of multi-user beamforming saturates at high SNR. However, this is not the case for single-user beamforming. We propose a low-complexity user scheduling algorithm that selects the number of active users based on a closed-form approximation of the average sum-rate, and in particular does not add multiple users in the single-user optimality range. In order to develop this algorithm we derive the expected value of the rate of zero-forcing beamforming and MMSE beamforming with estimated channels and modify the greedy user selection accordingly. The gain of the proposed method is shown in numerical simulations.

Place, publisher, year, edition, pages
IEEE , 2008. 3137-3140 p.
Keyword [en]
Broadcast channel (BC), downlink scheduling, multiple-input multiple-output (MIMO), imperfect channel state information (CSI), zero-forcing beamforming (ZFBF)
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-25602DOI: 10.1109/ICASSP.2008.4518315ISBN: 978-1-4244-1483-3 (print)OAI: oai:DiVA.org:liu-25602DiVA: diva2:246081
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2016-08-31

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Publisher's full textGreedy User Selection for Zero-forcing and MMSE Multiuser Beamforming with Channel Estimation Errors

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Larsson, Erik G.

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CiteExportLink to record
Permanent link

Direct link
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