Patent ID: 7308063
Filing Date: 2007-12-11
Classification: H04L

Abstract:
1. A method comprising: receiving an OFDM signal having one or more training symbols transmitted on a portion of regularly-spaced subcarriers of the OFDM signal; converting the OFDM signal, using an FFT, to the frequency domain; compensating the pilot phase of the OFDM signal using said one or more training symbols, said one or more training symbols corresponding to one or more training symbols used in the generation of the OFDM signal; determining a fractional frequency offset of the OFDM signal based on said one or more training symbols with reference to: where η is a constant, ∠ denotes the pilot phase, {tilde over (R)} l denoted the pilots processed by de-rotating the original pilot phase, c s denotes the base pilot subcarrier; index, l denotes the 1 th non-zero pilot subcarrier, ρ denotes the basic offset from the base pilot subcarrier, and P is the number of non-zero pilot subcarriers; and correcting the OFDM signal according to the amount of fractional frequency offset without utilizing a correlation block.