Efficient QR-based multi-mode precoding for limited feedback multi-user MIMO systems

Chien-Hung Pan*, Ta-Sung Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This paper proposes QR-based criteria for efficient selection of multi-mode precoders in multi-user multiple-input multiple-output (MU-MIMO) precoded systems with a limited feedback. In particular, a MU-MIMO QR based precoding scheme is developed which takes advantage of the overall precoder design among users in conjunction with QR detection. A selection criterion is developed to identify the precoder that yields the maximum free distance. Efficient mode selection and tree search strategies are adopted to reduce the complexity associated with the identification of the optimum precoder. To further improve the detection performance in correlated channels, an efficient QR-based MMSE V-BLAST detector is proposed. Computer simulations confirm that the proposed QR-based precoding scheme attains the performance of existing schemes with a significantly lower complexity level.

Original languageEnglish
Pages (from-to)969-987
Number of pages19
JournalWireless Personal Communications
Issue number2
StatePublished - 1 Jan 2014


  • Limited feedback system
  • Multi-mode precoding
  • Multiple-input multiple-output
  • QR decomposition

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