Symbol time offset estimation in coherent OFDM systems

Author

Landström, Daniel ; Wilson, Sarah Kate ; van de Beek, J.-J. ; Ödling, Per ; BÖrjesson, Per Ola

Author_Institution

Dept. of Electrosciences, Lund Inst. of Technol., Sweden

Volume

50

Issue

4

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

545

Lastpage

549

Abstract

This paper presents a symbol time offset estimator for coherent orthogonal frequency division multiplexing (OFDM) systems. The estimator exploits both the redundancy in the cyclic prefix and available pilot symbols used for channel estimation. The estimator is robust against frequency offsets and is suitable for use in dispersive channels. We base the estimator on the maximum-likelihood estimator for the additive white Gaussian noise channel. Simulations for an example system indicate a system performance as close as 0.6 dB to a perfectly synchronized system

Keywords

AWGN channels; OFDM modulation; dispersive channels; maximum likelihood estimation; redundancy; synchronisation; additive white Gaussian noise channel; available pilot symbols; channel estimation; coherent OFDM systems; coherent orthogonal frequency division multiplexing systems; cyclic prefix; dispersive channels; frequency offsets; maximum likelihood estimator; redundancy; symbol time offset estimation; AWGN; Additive white noise; Channel estimation; Delay estimation; Frequency estimation; Frequency synchronization; Intersymbol interference; Maximum likelihood estimation; OFDM; Redundancy;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.996067

Filename

996067