Title :
Comparison of integer frequency offset estimators for OFDM systems
Author :
Chen, Chen ; Li, Jiandong ; Zhao, Linjing
Author_Institution :
Inf. Sci. Inst., Xidian Univ., Xi´´an, China
fDate :
29 Nov.-3 Dec. 2004
Abstract :
In this paper, a new maximum likelihood (ML) estimator for the integer frequency offset estimation of OFDM systems is proposed and compared with the conventional SC estimator. Both estimators exploit the differential information between two consecutive blocks of OFDM data symbols in the frequency domain. The reason why the proposed ML estimator has better performance than the conventional SC method is analyzed. The mean and variance of the proposed and conventional estimators are discussed, and the estimation error probability is given. The computer simulation results are in good agreement with the analytical study.
Keywords :
AWGN channels; OFDM modulation; error statistics; fading channels; frequency estimation; maximum likelihood estimation; AWGN channel; OFDM data symbols; carrier frequency offset; consecutive block differential information; estimation error probability; frequency-selective fading channel; integer frequency offset estimation; maximum likelihood estimator; AWGN; Analytical models; Discrete Fourier transforms; Frequency estimation; Laboratories; Maximum likelihood estimation; OFDM; Performance analysis; State estimation; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE
Print_ISBN :
0-7803-8794-5
DOI :
10.1109/GLOCOM.2004.1378432
