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Greedy user selection for zero-forcing and MMSE multiuser beamforming with channel estimation errors
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
Linköping University Department of Electrical Engineering (ISY) Division of Communication Systems.
2008 (English)In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 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
2008. 3137-3140 p.
Series
International Conference on Acoustics Speech and Signal Processing (ICASSP), ISSN 1520-6149
Keyword [en]
broadcast channel (BC), downlink scheduling, multiple-input multiple-output (MIMO), imperfect channel state information (CSI), zero-forcing beamforming (ZFBF)
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-38772DOI: 10.1109/ICASSP.2008.4518315ISI: 000257456702107Scopus ID: 2-s2.0-51449103942ISBN: 978-1-4244-1483-3 (print)OAI: oai:DiVA.org:kth-38772DiVA: diva2:439100
Conference
2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP; Las Vegas, NV; 31 March 2008 through 4 April 2008
Available from: 2011-09-06 Created: 2011-08-31 Last updated: 2012-05-24Bibliographically approved

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Sjöbergh, OlofJorswieck, Eduard A.Larsson, Erik G.
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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
  • 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