Patent ID: 7830990

Claim:
A method for estimating frequency offset, suitable for a wireless communication with a quasi-periodical pilot structure, comprising: receiving a baseband signal with a preamble featuring quasi-periodic property; reconstructing the quasi-period property of the preamble of the received baseband signal by interpolation; and performing a frequency offset calculation on the reconstructed baseband signal to obtain a frequency offset angle, wherein the frequency offset calculation comprises: performing a correlation operation on a first quasi-period and a second quasi-period of the preamble of the baseband signal to obtain a first correlation function; performing a correlation operation on the second quasi-period and a third quasi-period of the preamble of the baseband signal to obtain a second correlation function; performing a correlation operation on the first correlation function and the second correlation function to obtain a third correlation function; and extracting the frequency offset angle according to the third correlation function.