A New Estimation Method of Propagation Characteristics Using Pilot-Data-Inserted OFDM Signals for High-Mobility OFDM Transmission Scheme

Hiroshi HARADA  Takako YAMAMURA  Masayuki FUJISE  

IEICE TRANSACTIONS on Communications   Vol.E85-B   No.5   pp.882-894
Publication Date: 2002/05/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Wireless Communications Issue)
OFDM,  pilot signal,  channel estimation,  ISI cancellation,  

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A method for estimating propagation characteristics is described that uses the characteristics of pilot-data-inserted orthogonal frequency division multiplexing (OFDM) signal and is suitable for high-mobility OFDM transmission scheme. Several pilot data are inserted periodically along the frequency axis before the inverse fast Fourier transformation (IFFT) process in the transmitter. At the receiver, the received OFDM signal is correlated with a prepared distinctive OFDM signal in which several pilot data are inserted in the same positions as in the transmitted OFDM symbols and zeros are inserted in the other positions. The propagation characteristics can be estimated precisely and used to cancel any interference caused by delayed waves. Computer simulation shows that this method can estimate the propagation characteristics, which can then be used to cancel the interference caused by delayed waves before the FFT at the receiver under fast multipath fading conditions.