Common rate support in multi-antenna downlink channels using semi-orthogonal user selection

Taesang Yoo, Gerard J. Foschini, Reinaldo A. Valenzuela, Andrea J. Goldsmith

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We consider a flat fading multiantenna downlink system with a large number of users where the objective is to deliver equal rates to nonoutage users with a low complexity. We show that in the limit of a large number of users, a zero-forcing beamforming strategy combined with a low complexity user grouping algorithm based on a semi-orthogonal user selection achieves asymptotically optimal performance, with respect to an upper bound that can be achieved when no interference is present among users.

Original languageEnglish (US)
Article number5773070
Pages (from-to)3449-3461
Number of pages13
JournalIEEE Transactions on Information Theory
Volume57
Issue number6
DOIs
StatePublished - Jun 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences

Keywords

  • MIMO downlink
  • multi-user diversity
  • semi-orthogonal user selection
  • zero-forcing beamforming

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