Transmit beamforming method based on maximum-norm combining for MIMO systems

Heunchul Lee, Seokhwan Park, Inkyu Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this paper, we present a low-complexity method to generate a transmit beamforming vector for multiple-input-multiple-output (MIMO) systems. We begin by introducing new definitions regarding orthogonality between two complexvalued vectors and then present new expressions of complex rotation matrices for the complex vector orthogonalization. The rotation matrices are utilized to derive the weight vector for the maximum-norm combining (MNC) process of two complex vectors, which provides a constructive basis for a new beamforming method. The proposed transmit beamforming method uses successive column combining of MIMO channel matrices based on MNC, and as a result, an approximate solution to the optimum beamforming vector is obtained. The proposed method offers a good tradeoff between complexity and performance. Simulation results demonstrate that the proposed beamforming method achieves the near-optimal performance with much reduced computational complexity, compared to the optimal beamforming scheme using singular-value decomposition (SVD) of the channel matrix.

Original languageEnglish
Article number4907470
Pages (from-to)2067-2075
Number of pages9
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number4
DOIs
Publication statusPublished - 2009 Apr 1

    Fingerprint

Keywords

  • Complex rotation matrix
  • Maximum-norm combining (MNC)
  • Multiple-input-multiple-output (MIMO) systems
  • Transmit-beamforming technique

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this