A combined timing and frequency synchronization and channel estimation for OFDM

TitleA combined timing and frequency synchronization and channel estimation for OFDM
Publication TypeJournal Article
Year of Publication2006
AuthorsMinn, H., V. K. Bhargava, and K. B. Letaief
JournalCommunications, IEEE Transactions on
Volume54
Pagination416 - 422
Date Publishedmar.
ISSN0090-6778
Keywordschannel estimation, channel response estimation, coarse timing estimation, complexity reduction, frequency synchronization, frequency-offset estimation, maximum likelihood estimation, maximum likelihood realization, OFDM, OFDM modulation, orthogonal frequency division multiplexing system, sliding observation vector, timing synchronization
Abstract

This letter addresses training-signal-based combined timing and frequency synchronization and channel estimation for orthogonal frequency-division multiplexing systems. The proposed scheme consists of two stages. At the first stage, coarse timing and frequency-offset estimates are obtained. Based on these estimates, a (coarse) channel response estimate is obtained. The timing and frequency-offset estimates at the second stage are obtained by maximum-likelihood (ML) realization based on a sliding observation vector. Then ML channel estimation is performed. A means of complexity reduction by an adaptive scheme is also presented. The simulation results show that the proposed combined approach performs quite well, and circumvents the problem of mismatch among individual synchronization tasks.

URLhttp://dx.doi.org/10.1109/TCOMM.2006.869860
DOI10.1109/TCOMM.2006.869860

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