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Summary: 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--OFDM combines the advantages of high perfor-
mance and relatively low implementation complexity. However,
for reliable coherent detection of the input signal, the OFDM
receiver needs accurate channel information. When the chan-
nel exhibits fast time variation as it is the case with several
recent OFDM-based mobile broadband wireless 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 inter-carrier interference among the
OFDM sub-carriers 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 liter-
ature, we propose to perform channel estimation in the frequency
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