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.

Volume

55

Issue

5

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

2226

Lastpage

2238

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;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2007.893198

Filename

4156430