ML estimation of timing and frequency offset using multiple OFDM symbols in OFDM systems

Author

Lv, Tiejun ; Chen, Jie

Author_Institution

Sch. of Inf. Eng., Beijing Univ. of Posts & Telecommun., China

Volume

4

fYear

2003

fDate

1-5 Dec. 2003

Firstpage

2280

Abstract

An approach of joint blind estimation of the symbol timing offset and carrier frequency offset using multiple orthogonal frequency-division multiplexing (OFDM) symbols is proposed for OFDM systems in frequency selective fading environments. The proposed approach greatly improves the estimation accuracy of the synchronization parameters, more than the ML estimation of N. Lashkarian and S. Kiaei (see IEEE Trans. Commun., vol.48, p.2139-49, 2000). This conclusion is derived from analyzing their performances. Meanwhile, simulation shows that estimation of symbol timing is completely correct for signal-to-noise ratio (SNR) as low as 0 dB, and the variance of the frequency offset estimator is nearly close to its Cramer-Rao bound (CRB) with varying SNR.

Keywords

OFDM modulation; fading channels; frequency estimation; maximum likelihood estimation; synchronisation; timing; Cramer-Rao bound; ML estimation; SNR; blind estimation; carrier frequency offset estimation; frequency selective fading; multiple OFDM symbols; orthogonal frequency-division multiplexing; signal-to-noise ratio; symbol timing offset estimation; synchronization parameters; DSL; Frequency division multiplexing; Frequency estimation; Frequency synchronization; Maximum likelihood estimation; OFDM modulation; Parameter estimation; Timing; Transmitters; Yield estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE

Print_ISBN

0-7803-7974-8

Type

conf

DOI

10.1109/GLOCOM.2003.1258641

Filename

1258641