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General Rank Multiuser Downlink Beamforming With Shaping Constraints Using Real-Valued OSTBC
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-0737-2531
2015 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 63, no 21, 5758-5771 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, we consider optimal multiuser downlink beamforming in the presence of a massive number of arbitrary quadratic shaping constraints. We combine beamforming with full-rate high dimensional real-valued orthogonal space time block coding (OSTBC) to increase the number of beamforming weight vectors and associated degrees of freedom in the beamformer design. The original multi-constraint beamforming problem is converted into a convex optimization problem using semidefinite relaxation (SDR) which can be solved efficiently. In contrast to conventional (rank-one) beamforming approaches in which an optimal beamforming solution can be obtained only when the SDR solution (after rank reduction) exhibits the rank-one property, in our approach optimality is guaranteed when a rank of eight is not exceeded. We show that our approach can incorporate up to 79 additional shaping constraints for which an optimal beamforming solution is guaranteed as compared to a maximum of two additional constraints that bound the conventional rank-one downlink beamforming designs. Simulation results demonstrate the flexibility of our proposed beamformer design.

Place, publisher, year, edition, pages
2015. Vol. 63, no 21, 5758-5771 p.
Keyword [en]
Downlink beamforming, orthogonal space time block coding (OSTBC), semidefinite relaxation (SDR), shaping constraints
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-175905DOI: 10.1109/TSP.2015.2455516ISI: 000362414700013Scopus ID: 2-s2.0-84959450050OAI: oai:DiVA.org:kth-175905DiVA: diva2:867173
Funder
EU, FP7, Seventh Framework Programme, ADEL-619647
Note

QC 20151104

Available from: 2015-11-04 Created: 2015-10-26 Last updated: 2017-12-01Bibliographically approved

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CiteExportLink to record
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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
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  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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