Decision-directed channel estimation and high I/Q imbalance compensation in OFDM receivers

  • Authors:

  • Sylvain Traverso;Myriam Ariaudo;Inbar Fijalkow;Jean-Luc Gautier;Christian Lereau

  • Affiliations:

  • Department of Embedded Digital Systems, THALES Land & Joint Systems, Colombes;ETIS/ENSEA, CNRS, Université de Cergy, Cergy;ETIS/ENSEA, CNRS, Université de Cergy, Cergy;ETIS/ENSEA, CNRS, Université de Cergy, Cergy;Department of Unité Communication Tactique, THALES Land & Joint Systems, Chollet

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

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Abstract

Direct-conversion architectures suffer from the mismatch between the In-phase (I) and the Quadrature-phase (Q) branches, commonly called I/Q imbalance. Even low I/Q imbalances imply poor performance of Orthogonal Frequency Division Multiplexing (OFDM) systems. In this paper, we propose a new algorithm that uses both training and data symbols in a decision-directed fashion to jointly estimate the channel and compensate for high receiver I/Q imbalance. Simulation results show that our method can compensate for high I/Q imbalance values and also estimate a frequency selective channel.