Title :
Maximum-Likelihood Symbol Timing Estimation Algorithm for OFDM Systems Based on a Repeated Preamble
Author :
Seol, Changkyu ; Cheun, Kyungwhoon
Author_Institution :
Div. of Electr. & Comput. Eng., Pohang Univ. of Sci. & Technol.
Abstract :
An efficient synchronization scheme based on a repetitive preamble structure for orthogonal frequency division multiplexing systems was proposed by Schmidl and Cox. However, standard autocorrelation based estimation algorithms result in a plateau in the timing metric due to the cyclic prefix (CP), resulting in a region of uncertainty. Several modifications, either to the preamble structure itself or the estimation algorithm, have been proposed to remedy this problem. In this paper, we present a maximum-likelihood (ML) symbol timing estimation algorithm taking into account the presence of the CP. The performance of its practical modification is evaluated via computer simulations
Keywords :
OFDM modulation; maximum likelihood estimation; synchronisation; OFDM systems; computer simulations; maximum-likelihood symbol; orthogonal frequency division multiplexing; repetitive preamble; synchronization scheme; timing estimation algorithm; Autocorrelation; Computer simulation; Downlink; Frequency estimation; Frequency synchronization; Hardware; Maximum likelihood estimation; OFDM modulation; Timing; Uncertainty;
Conference_Titel :
Communications, 2006. APCC '06. Asia-Pacific Conference on
Conference_Location :
Busan
Print_ISBN :
1-4244-0574-2
Electronic_ISBN :
1-4244-0574-2
DOI :
10.1109/APCC.2006.255810