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Summary: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 7, NO. 7, JULY 2008 1
Coherent and Differential ICI Cancellation for Mobile OFDM with
Application to DVB-H
Sili Lu, Student Member, IEEE and Naofal Al-Dhahir, Fellow, IEEE
Abstract--We develop a reduced-complexity hybrid
frequency/time-domain orthogonal frequency division
multiplexing (OFDM) channel estimation algorithm for
high-mobility scenarios where the channel varies significantly
within each OFDM block, resulting in severe intercarrier
interference (ICI). The algorithm exploits the banded and
symmetric structure of the channel matrix in the frequency-
domain and its sparse structure in the time-domain to achieve
significant complexity reductions, which we quantify for
the Digital Video Broadcasting-Handheld (DVB-H) system.
Furthermore, we compare coherent and differential mobile
OFDM detection for DVB-H.
Index Terms--ICI mitigation, OFDM, channel estimation,
doppler shift
I. INTRODUCTION
SUPPORTING high mobility is a key requirement for
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