TY - JOUR
T1 - Time-varying FIR equalization for doubly selective channels
AU - Barhumi, Imad
AU - Leus, Geert
AU - Moonen, Marc
N1 - Funding Information:
Manuscript received December 19, 2002; revised August 4, 2003; accepted October 27, 2003. The editor coordinating the review of this paper and approving it for publication is H. Boelcskei. This work was supported by the Belgian State Prime Minister’s Office-Federal Office for Scientific, Technical and Cultural Affairs-Interuniversity Poles under Attraction Programme (2002–2007)-IUAP P5/22 (“Dynamical Systems and Control: Computation, Identification and Modeling”) and Programme 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 G.0196.02 (“Design of efficient communication techniques for wireless time-dispersive multi-user MIMO systems”). The work of I. Barhumi was supported in part by the Palestinian European Academic Cooperation in Education (PEACE) Programme.
PY - 2005/1
Y1 - 2005/1
N2 - In this paper, we propose a time-varying (TV) finite impulse response (FIR) equalizer for doubly selective (time- and frequency-selective) channels. We use a basis expansion model (BEM) to approximate the doubly selective channel and to design the TV FIR equalizer. This allows us to turn a complicated equalization problem into an equivalent simpler equalization problem, containing only the BEM coefficients of both the doubly selective channel and the TV FIR equalizer. The minimum mean-square error (MMSE) as well as the zero-forcing (ZF) solutions are considered. Comparisons with the block linear equalizer (BLE) are made. The TV FIR equalization we propose here unifies and extends many previously proposed serial equalization approaches. In contrast to the BLE, the proposed TV FIR equalizer allows a flexible tradeoff between complexity and performance. Moreover, through computer simulations, we show that the performance of the proposed MMSE TV FIR equalizer comes close to the performance of the ZF and MMSE BLE, at a point where the design as well as the implementation complexity are much lower.
AB - In this paper, we propose a time-varying (TV) finite impulse response (FIR) equalizer for doubly selective (time- and frequency-selective) channels. We use a basis expansion model (BEM) to approximate the doubly selective channel and to design the TV FIR equalizer. This allows us to turn a complicated equalization problem into an equivalent simpler equalization problem, containing only the BEM coefficients of both the doubly selective channel and the TV FIR equalizer. The minimum mean-square error (MMSE) as well as the zero-forcing (ZF) solutions are considered. Comparisons with the block linear equalizer (BLE) are made. The TV FIR equalization we propose here unifies and extends many previously proposed serial equalization approaches. In contrast to the BLE, the proposed TV FIR equalizer allows a flexible tradeoff between complexity and performance. Moreover, through computer simulations, we show that the performance of the proposed MMSE TV FIR equalizer comes close to the performance of the ZF and MMSE BLE, at a point where the design as well as the implementation complexity are much lower.
KW - Doubly selective channels
KW - Equalization
KW - Fading channels
KW - Orthogonal frequency division multiplexing (OFDM)
KW - Time-varying finite impulse response (TV fIR)
KW - Two-dimensional (2-D) equalization
KW - Wireless communications
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U2 - 10.1109/TWC.2004.840204
DO - 10.1109/TWC.2004.840204
M3 - Article
AN - SCOPUS:19944417280
SN - 1536-1276
VL - 4
SP - 202
EP - 214
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 1
ER -