Sampling frequency offset tracking method and OFDM system...

Details Sampling frequency offset tracking method and OFDM system... Sampling frequency offset tracking method and OFDM system...

2006-06-02

2009-12-01

Tse, Young T. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07627049

ABSTRACT:
A sampling frequency offset tracking method in an orthogonal frequency division multiplexing (OFDM) system includes determining a search direction of maximum likelihood estimation (MLE) using a carrier frequency offset estimated using pilot subcarriers of a received signal; calculating a size of a MLE search region using a maximum sampling frequency offset of the OFDM system and a resolution of the MLE; calculating a range of the MLE search region for each OFDM symbol based on the size of the MLE search region; and tracking the sampling frequency offset by calculating a maximum correlation between the pilot subcarriers and reference pilot subcarriers within the MLE search region each OFDM symbol. Accordingly, the search region of the MLE is reduced according to the sign of the estimated carrier frequency offset. Therefore, the sampling frequency offset can be easily tracked and the estimation error can be reduced.

REFERENCES:
patent: 2002/0145971 (2002-10-01), Cho et al.
patent: 2004/0125742 (2004-07-01), Schmidt
patent: 2004/0141457 (2004-07-01), Seo et al.
patent: 2004/0184551 (2004-09-01), Liu et al.
patent: 2005/0084025 (2005-04-01), Chen
patent: 2005/0100106 (2005-05-01), Chen

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