Robust joint frequency offset and channel estimation for OFDM systems

Author

Cui, Tao ; Tellambura, Chintha

Author_Institution

Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada

Volume

1

fYear

2004

Firstpage

603

Abstract

We consider the joint carrier frequency offset (CFO) and channel estimation for OFDM systems. A novel frequency offset estimator is derived based on maximum likelihood principles by using the pilot symbols embedded in each OFDM symbol. An iterative joint CFO and channel estimator is proposed to further reduce the estimation error and improve the system performance. The joint estimator is initialized with the first CFO estimate and linearly interpolated channel estimates. The CFO and channel response estimates are updated by maximum likelihood (ML) and least squares (LS) algorithms. Simulation results show that the proposed joint estimator is effective and can achieve excellent bit error rates in just one iteration.

Keywords

OFDM modulation; channel estimation; error statistics; frequency estimation; interpolation; least squares approximations; maximum likelihood estimation; CFO; OFDM symbol; OFDM systems; bit error rates; embedded pilot symbols; estimation error; frequency offset estimator; iterative joint CFO channel estimator; least squares algorithms; linearly interpolated channel estimates; maximum likelihood algorithms; maximum likelihood principles; robust joint frequency offset and channel estimation; system performance; Bit error rate; Channel estimation; Estimation error; Frequency estimation; Iterative algorithms; Least squares approximation; Maximum likelihood estimation; OFDM; Robustness; System performance;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1400078

Filename

1400078