Time-domain and frequency-domain per-tone equalization for OFDM over doubly selective channels

Imad Barhumi, Geert Leus, Marc Moonen

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


In this paper, we propose new time- and frequency-domain per-tone equalization techniques for orthogonal frequency division multiplexing (OFDM) transmission over time- and frequency-selective channels. We present one mixed time- and frequency-domain equalizer (MTFEQ) and one frequency-domain per-tone equalizer. The MTFEQ consists of a one-tap time-varying (TV) time-domain equalizer (TEQ), which converts the doubly selective channel into a purely frequency-selective channel, followed by a one-tap frequency-domain equalizer (FEQ), which then equalizes the resulting frequency-selective channel in the frequency-domain. The frequency-domain per-tone equalizer (PTEQ) is then obtained by transferring the TEQ operation to the frequency-domain. While the one-tap TEQ of the MTFEQ optimizes the performance on all subcarriers in a joint fashion, the PTEQ optimizes the performance on each subcarrier separately. This results into a significant performance improvement of the PTEQ over the MTFEQ, at the cost of a slight increase in complexity. Through computer simulations we show that the MTFEQ suffers from an early and high error floor, while the PTEQ outperforms the MMSE equalizer for OFDM over purely frequency-selective channels, it can approach the performance of the block MMSE equalizer. An important feature of the proposed techniques is that no bandwidth expansion or redundancy insertion is required except for the cyclic prefix.

Original languageEnglish
Pages (from-to)2055-2066
Number of pages12
JournalSignal Processing
Issue number11 SPEC. ISS.
Publication statusPublished - Nov 2004
Externally publishedYes


  • Doubly selective fading channel
  • Frequency-domain per-tone equalization
  • OFDM
  • Time-domain equalization

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Signal Processing
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering


Dive into the research topics of 'Time-domain and frequency-domain per-tone equalization for OFDM over doubly selective channels'. Together they form a unique fingerprint.

Cite this