Pilot-based Fast Estimation of Frequency Offset and Channel for OFDM

Author

Zeng, Yonghong ; Leyman, A. Rahim

Author_Institution

Inst. for Infocomm Res.

Volume

4

fYear

2006

fDate

7-10 May 2006

Firstpage

1570

Lastpage

1574

Abstract

A new fast algorithm is proposed for estimating the CFO based on the pilot structure in M. Morelli et al. (1999), H.K. Song et al., (2000). The new method first identifies a coarse estimation of the CFO and then refines it by a least square (LS) method. It always gives a more accurate estimation than the multi-stage method in H.K. Song et al. (2000) and is better than the method in M. Morelli et al. (1999) at low SNR. It is only slightly worse than the maximum likelihood estimator at high SNR. Furthermore, the proposed method can be used for CFO tracking. Also, in this paper, channel estimation by using the same pilot block is considered. The best values for the non-null subcarriers are found to optimize the channel estimation and peak to average power ratio (PAPR) simultaneously. Simulations demonstrate that the proposed methods are effective

Keywords

OFDM modulation; channel estimation; frequency estimation; least squares approximations; CFO; OFDM; PAPR; SNR; carrier frequency offset estimation; channel estimation; least square method; maximum likelihood estimator; multi-stage method; orthogonal frequency division multiplexing; peak to average power ratio; pilot-based fast estimation; signal-to-noise ratio; Channel estimation; Cost function; Frequency estimation; Least squares approximation; Maximum likelihood estimation; OFDM; Peak to average power ratio; Signal to noise ratio; Transceivers; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd

Conference_Location

Melbourne, Vic.

ISSN

1550-2252

Print_ISBN

0-7803-9391-0

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2006.1683110

Filename

1683110