A Scattered Pilot OFDM Receiver with Equalization for Multipath Environments with Delay Difference Greater than Guard Interval

Satoshi SUYAMA
Masafumi ITO
Hiroshi SUZUKI
Kazuhiko FUKAWA

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.1    pp.275-282
Publication Date: 2003/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
OFDM,  scattered pilot,  inter-symbol interference,  inter-carrier interference,  equalizer,  

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OFDM transmission performance in mobile communications suffers severe degradation caused by multipath delay difference greater than the Guard Interval (GI). This is because the excess delay results in considerable Inter-Symbol Interference (ISI) between temporally adjacent symbols and Inter-Carrier Interference (ICI) among subcarriers in the same symbol. This paper proposes a robust OFDM receiver for the scattered pilot OFDM signal that can effectively suppress both ISI and ICI by using two types of equalization and a smoothed FFT-window. In order to verify the performance of the proposed receiver, computer simulations are conducted in accordance with the scattered pilot OFDM signal format of the Digital Terrestrial Television Broadcasting (DTTB). The simulation results demonstrate that the proposed receiver shows much better performance than the conventional receiver in multipath fading environments with the delay difference greater than GI duration.