A reduced feedback precoder for MIMO-OFDM cooperative diversity systems

Kyeong Jin Kim, Yijia Fan, Ronald A. Iltis, H. Vincent Poor, Moon Ho Lee

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


A new precoder that reduces the feedback overhead in an orthogonal frequency-division multiplexing (OFDM)-based relay network is proposed. A joint singular value decomposition (SVD) and QR decomposition is employed on the source-destination link and the source-relay-destination link. Using the proposed precoder, only one precoding matrix needs to be fed back, independent of the total number of subcarriers. Kernel density estimation is applied to determine approximate forms of unknown distributions of the end-to-end effective channel powers obtained by this precoder. Using approximated probability density functions (pdfs) for these effective channel powers, closed-form expressions for the link achievable average sum-rate and the outage probability can be derived and then their accuracies verified via Monte Carlo simulations. The achievable sum-rates are also compared with that of SVD-based precoders and for varying codebook size.

Original languageEnglish (US)
Article number6112254
Pages (from-to)584-596
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Issue number2
StatePublished - Feb 2012

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Automotive Engineering


  • Achievable average sum-rate
  • Cooperative relay network
  • Grassmannian codebook
  • Kernel density estimation (KDE)
  • Multiple-input-multiple-output- orthogonal frequencydivision multiplexing (MIMO-OFDM) feedback overhead
  • Outage probability
  • Precoder


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