Regularized channel inversion with quantized feedback in down-link multiuser channels

Duckdong Hwang, Bruno Clerckx, Gil Kim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We consider regularized channel inversion (RI) precoding in the multiuser multiple input multiple output (Mu- MIMO) broadcast channels. To make the RI operate in quantized channel feedback condition, we analyze the quantization error variance and its effect on the signal to interference plus noise power ratio (SINR) of the user signals. The regularization parameter α is optimized to balance the additive noise, the multiuser interference and the interference due to the quantization error and to maximize SINR. Analysis and simulations show that regularization enhances the performance of zero forcing beam forming (ZFBF) over the whole signal to noise power ratio (SNR) range. This is contrasting to the perfect channel status information (CSI) case, where the enhancement is observed in the low SNR region.

Original languageEnglish
Article number5351694
Pages (from-to)5785-5789
Number of pages5
JournalIEEE Transactions on Wireless Communications
Issue number12
Publication statusPublished - 2009 Dec


  • Broadcasting channels
  • Quantized feedback
  • Regularized channel inversion
  • Sum-rate capacity

ASJC Scopus subject areas

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


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