Title :
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
fDate :
4/1/2002 12:00:00 AM
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;
Journal_Title :
Communications, IEEE Transactions on
