Title :
A simple time-slot ML-based frequency tracking scheme for OFDM systems
Author :
Yen, Rainfield Y. ; Cheng, T.T. ; Wu, C.M.
Author_Institution :
Dept. of Electr. Eng., Tamkang Univ., Taipei
Abstract :
By using a pilot sample from a selected time-slot in a time-domain orthogonal frequency division multiplexing (OFDM) block, we present a simple maximum-likelihood (ML) scheme for frequency tracking in OFDM systems over frequency-selective channels. The frequency offset estimator thus obtained is found to become unbiased and its mean square error (MSE) will approach the Cramer-Rao bound (CRB) as signal-to-noise ratio (SNR) is increased. Moreover, the selection of time slot can determine a trade-off between tracking accuracy and tracking range.
Keywords :
OFDM modulation; channel estimation; frequency estimation; maximum likelihood estimation; mean square error methods; time-domain analysis; tracking; Cramer-Rao bound; OFDM systems; frequency offset estimator; frequency-selective channels; maximum-likelihood scheme; mean square error; orthogonal frequency division multiplexing; time-domain analysis; time-slot ML-based frequency tracking scheme; AWGN; Channel estimation; Frequency estimation; Frequency synchronization; Maximum likelihood detection; Maximum likelihood estimation; Mean square error methods; OFDM; Time domain analysis; Timing; Cramer-Rao bound (CRB); Maximum-likelihood (ML) estimation; frequency offset;
Conference_Titel :
Networking, Sensing and Control, 2009. ICNSC '09. International Conference on
Conference_Location :
Okayama
Print_ISBN :
978-1-4244-3491-6
Electronic_ISBN :
978-1-4244-3492-3
DOI :
10.1109/ICNSC.2009.4919331
