Frequency-domain bit-flipping equalizer for wideband MIMO channels

  • Authors:
  • Toshiaki Koike-Akino;Natasha Devroye;Vahid Tarokh

  • Affiliations:
  • School of Engineering and Applied Sciences, Harvard University, Cambridge, MA;Department of Electrical and Computer Engineering, University of Illinois at Chicago;School of Engineering and Applied Sciences, Harvard University, Cambridge, MA

  • Venue:
  • IEEE Transactions on Wireless Communications
  • Year:
  • 2009

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Abstract

We propose a low-complexity equalizer whose performance approaches that of the optimal maximum-likelihood estimators in wideband multiple-input multiple-output (MIMO) channels. The proposed algorithm makes use of a bit-flipping refinement procedure preceded by a frequency-domain equalizer and is based on local-optima searching algorithms. Through performance evaluations, it is demonstrated that the proposed equalizer can perform well when a large number of diversity branches are available in severely dispersive fading channels.