Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400078
