Precoding techniques for MIMO AF relaying systems with decision feedback receiver

Minki Ahn, Han Bae Kong, Taehoon Kim, Changick Song, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


In this paper, we provide new precoding schemes which jointly optimize the source and relay precoders in multiple-input multiple-output amplify-and-forward relaying systems with minimum mean-squared error decision feedback equalizer (DFE) at the destination node. Instead of conventional schemes which resort to an iterative method, we propose simple precoding schemes based on a closed-form solution. To this end, we first extend the decomposable property of the error covariance matrix for a linear receiver to relaying systems with DFE receivers. Then, we suggest two closed-form solutions which successively identify the source and the relay precoders. To improve the performance, a mode selection which adaptively chooses one of the two closed-form precoding schemes according to the channel conditions is introduced. Then, we propose a simple eigenvalue based mode selection algorithm, and analyze its selection probability behavior for Rayleigh fading channels. Simulation results demonstrate that the performance of the proposed method is almost identical to the iterative solution with much reduced complexity.

Original languageEnglish
Article number6881752
Pages (from-to)446-455
Number of pages10
JournalIEEE Transactions on Wireless Communications
Issue number1
Publication statusPublished - 2015 Jan 1

Bibliographical note

Publisher Copyright:
© 2014 IEEE.


  • MIMO systems
  • mode selection
  • relays
  • transceivers

ASJC Scopus subject areas

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


Dive into the research topics of 'Precoding techniques for MIMO AF relaying systems with decision feedback receiver'. Together they form a unique fingerprint.

Cite this