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

fYear

2009

fDate

26-29 March 2009

Firstpage

525

Lastpage

527

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICNSC.2009.4919331

Filename

4919331