TY - JOUR
T1 - Equalization for OFDM over doubly selective channels
AU - Barhumi, Imad
AU - Leus, Geert
AU - Moonen, Marc
N1 - Funding Information:
Manuscript received July 6, 2004; revised May 1, 2005. This research work was carried out at the ESAT Laboratory of the Katholieke Universiteit Leuven, in the frame of Belgian Programme on Interuniversity Attraction Poles, initiated by the Belgian Federal Science Policy Office IUAP P5/22 (“Dynamical Systems and Control: Computation, Identification and Modeling”) and P5/11 (“Mobile multimedia communication systems and networks”), the Concerted Research Action GOA-MEFISTO-666 (Mathematical Engineering for Information and Communication Systems Technology) of the Flemish Government, and Research Project FWO nr.G.0196.02 (“Design of efficient communication techniques for wireless time-dispersive multi-user MIMO systems”). The scientific responsibility is assumed by its authors. The work of I. Barhumi is partly supported by the Palestinian European Academic Cooperation in Education (PEACE) Programme. The work of G. Leus is supported by NWO-STW under the VICI program (DTC.5893). The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Ananthram Swami.
PY - 2006/4
Y1 - 2006/4
N2 - In this paper, we propose a time-domain as well as a frequency-domain per-tone equalization for orthogonal frequency-division multiplexing (OFDM) over doubly selective channels. We consider the most general case, where the channel delay spread is larger than the cyclic prefix (CP), which results in interblock interference (IBI). IBI in conjunction with the Doppler effect destroys the orthogonality between subcarriers and, hence, results in severe intercarrier interference (ICI). In this paper, we propose a time-varying finite-impulse-response (TV-FIR) time-domain equalizer (TEQ) to restore the orthogonality between subcarriers, and hence to eliminate ICI/IBI. Due to the fact that the TEQ optimizes the performance over all subcarriers in a joint fashion, it has a poor performance. An optimal frequency-domain per-tone equalizer (PTEQ) is then obtained by transferring the TEQ operation to the frequency domain. Through computer simulations, we demonstrate the performance of the proposed equalization techniques.
AB - In this paper, we propose a time-domain as well as a frequency-domain per-tone equalization for orthogonal frequency-division multiplexing (OFDM) over doubly selective channels. We consider the most general case, where the channel delay spread is larger than the cyclic prefix (CP), which results in interblock interference (IBI). IBI in conjunction with the Doppler effect destroys the orthogonality between subcarriers and, hence, results in severe intercarrier interference (ICI). In this paper, we propose a time-varying finite-impulse-response (TV-FIR) time-domain equalizer (TEQ) to restore the orthogonality between subcarriers, and hence to eliminate ICI/IBI. Due to the fact that the TEQ optimizes the performance over all subcarriers in a joint fashion, it has a poor performance. An optimal frequency-domain per-tone equalizer (PTEQ) is then obtained by transferring the TEQ operation to the frequency domain. Through computer simulations, we demonstrate the performance of the proposed equalization techniques.
KW - Basis expansion model (BEM)
KW - Doubly selective channels
KW - Orthogonal frequency-division multiplexing (OFDM)
KW - Per-tone equalization (PTEQ)
KW - Time-domain equalization (TEQ)
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U2 - 10.1109/TSP.2006.870566
DO - 10.1109/TSP.2006.870566
M3 - Article
AN - SCOPUS:33645294930
SN - 1053-587X
VL - 54
SP - 1445
EP - 1458
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
IS - 4
ER -