Low-complexity downlink beamforming for maximum sum capacity

Goran Dimić, Nicholas D. Sidiropoulos

Research output: Contribution to journalConference articlepeer-review

16 Scopus citations

Abstract

The problem of simultaneous multiuser downlink beam-forming has recently attracted significant interest in both the Information Theory and Signal Processing communities. The idea is to employ a transmit antenna array to create multiple 'beams' directed towards the individual users, and the aim is to increase throughput, measured by sum capacity. Optimal solutions to this problem require convex optimization and so-called Dirty Paper (DP) precoding for known interference, which are prohibitively complex for actual online implementation at the base station. Motivated by recent results by Viswanathan et al and Caire and Shamai, we propose a computationally simple user selection method coupled with zero-forcing beamforming. Our results indicate that the proposed method attains a significant fraction of sum capacity, and thus offers an attractive alternative to DP-based schemes.

Original languageEnglish (US)
Pages (from-to)IV-701-IV-704
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume4
StatePublished - 2004
EventProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada
Duration: May 17 2004May 21 2004

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