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Summary: IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 58, NO. 4, APRIL 2010 2181
A Model Reduction Approach for OFDM Channel
Estimation Under High Mobility Conditions
Tareq Y. Al-Naffouri, K. M. Zahidul Islam, Student Member, IEEE, Naofal Al-Dhahir, Fellow, IEEE, and
Sili Lu, Student Member, IEEE
Abstract--Orthogonal frequency-division multiplexing (OFDM)
combines the advantages of high performance and relatively low
implementation complexity. However, for reliable coherent detec-
tion of the input signal, the OFDM receiver needs accurate channel
information. When the channel exhibits fast time variation as it is
the case with several recent OFDM-based mobile broadband wire-
less standards (e.g., WiMAX, LTE, DVB-H), channel estimation
at the receiver becomes quite challenging for two main reasons:
1) the receiver needs to perform this estimation more frequently
and 2) channel time-variations introduce intercarrier interference
among the OFDM subcarriers which can degrade the performance
of conventional channel estimation algorithms significantly. In this
paper, we propose a new pilot-aided algorithm for the estimation
of fast time-varying channels in OFDM transmission. Unlike many
existing OFDM channel estimation algorithms in the literature, we
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