Title :
Frequency offset estimation with fast acquisition in OFDM system
Author :
Zhang, Zhongshan ; Zhao, Ming ; Zhou, Haiyan ; Liu, Yuanan ; Gao, Jinchun
Author_Institution :
Center for Wireless Commun., Beijing Univ. of Posts & Telecommun., China
fDate :
3/1/2004 12:00:00 AM
Abstract :
A new carrier frequency offset estimation scheme in orthogonal frequency-division multiplexing (OFDM) system is proposed. The carrier frequency offset estimation includes acquisition and tracking, and the acquisition range is as large as one half of overall signal bandwidth. The proposed tracking estimator is a maximum-likelihood estimator, and in AWGN channel, the Cramer-Rao lower bound is met at high signal-to-noise ratio (SNR); in multipath channel, the tracking algorithm works well at moderate SNR. Timing synchronization can be also performed during the course of acquisition.
Keywords :
AWGN channels; OFDM modulation; frequency estimation; maximum likelihood estimation; multipath channels; synchronisation; AWGN channel; Cramer-Rao lower bound; OFDM; carrier frequency offset estimation scheme; fast acquisition; maximum-likelihood estimator; multipath channel; orthogonal frequency-division multiplexing system; overall signal bandwidth; signal-to-noise ratio; timing synchronization; tracking algorithm; AWGN channels; Bandwidth; Frequency division multiplexing; Frequency estimation; Frequency synchronization; Maximum likelihood estimation; Multipath channels; OFDM; Signal to noise ratio; Timing;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2004.823423
