Title :
Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems
Author :
Tang, Zijian ; Cannizzaro, Rocco Claudio ; Leus, Geert ; Banelli, Paolo
Author_Institution :
Fac. of Electr. Eng., Math. & Comput. Sci., Delft Univ. of Technol.
fDate :
5/1/2007 12:00:00 AM
Abstract :
In this paper, we deal with channel estimation for orthogonal frequency-division multiplexing (OFDM) systems. The channels are assumed to be time-varying (TV) and approximated by a basis expansion model (BEM). Due to the time-variation, the resulting channel matrix in the frequency domain is no longer diagonal, but approximately banded. Based on this observation, we propose novel channel estimators to combat both the noise and the out-of-band interference. In addition, the effect of a receiver window on channel estimation is also studied. Our claims are supported by simulation results, which are obtained considering Jakes´ channels with fairly high Doppler spreads
Keywords :
OFDM modulation; channel estimation; matrix algebra; time-varying channels; Doppler spreads; OFDM systems; basis expansion model; channel matrix; orthogonal frequency-division multiplexing; out-of-band interference; pilot-assisted time-varying channel estimation; receiver window; Channel estimation; Frequency division multiplexing; Frequency domain analysis; Frequency estimation; Interference; OFDM; Polynomials; Statistics; TV; Time-varying channels; Basis expansion model (BEM); orthogonal frequency-division multiplexing (OFDM); pilot-assisted modulation; time-varying (TV) channels;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2007.893198
