Patent ID: 8229011

Claim:
A fine symbol timing synchronization method in an orthogonal frequency-division multiplexing (OFDM) system, comprising: receiving a plurality of first time domain symbol signals; performing a fast Fourier transform (FFT) on the first time domain symbol signals to generate a plurality of first frequency domain symbol signals; extracting a plurality of scattered pilots from the first frequency domain symbol signals, and calculating a plurality of first channel frequency responses according to the scattered pilots; performing an interpolation on the first channel frequency responses to generate a second channel frequency response; storing one of the first frequency domain symbol signals, wherein the stored first frequency domain symbol signal is corresponding to the second channel frequency response; performing a zero padding operation on the second channel frequency response, and performing an inversed fast Fourier transform (IFFT) on a zero padding result to obtain a first channel impulse response; setting a threshold, and finding a plurality of paths in the first channel impulse response according to the first channel impulse response and the threshold; and calculating a mean square error (MSE) between frequency domain data in the first frequency domain symbol signals and a third channel frequency response when each path in the first channel impulse response serves as a first path, and setting the path with a minimum mean square error (MMSE) as the first path.