Patent ID: 8428206

Claim:
A method of fine timing synchronization of a signal generated by a coarse timing synchronization unit, the coarse timing synchronization unit having generated the signal by performing a fast Fourier transform (FFT) and a carrier frequency offset on an orthogonal frequency division multiplexing (OFDM) signal, the OFDM signal comprising a transmission identification, synchronization symbols and at least one OFDM symbol, wherein the resulting signal includes a synchronization sequence and a channel frequency response (CFR), comprising: removing the synchronization sequence of the signal to obtain the CFR, the synchronization sequence having been generated by performing the FFT on the synchronization symbols of the OFDM signal; calculating a correlation coefficient of the correlation between the CFR applied to a number of carriers and the CFR applied to the number of carriers with different window shifts, the largest window shift corresponding to a downsampling factor indicated by the lowest correlation coefficient greater than a threshold; downsampling the CFR by the downsampling factor; performing an inverse FFT on the downsampled CFR with a reduced number of calculations reduced by the downsampling factor, wherein the downsampled CFR is transformed into a channel impulse response (CIR) in the time domain; and determining a fine timing synchronization position from the CIR, the fine timing synchronization position configured to provide an accurate channel power delay profile to determine window size and position of an FFT unit within an OFDM receiver, and providing the fine timing synchronization position to the FFT unit within the OFDM receiver to accurately receive the at least one OFDM symbol of the OFDM signal.