Patent ID: 7792202

Claim:
An apparatus for estimating a timing offset of each of a plurality of orthogonal frequency division multiplexing (OFDM) symbols that are fast Fourier transform (FFT)-processed, the apparatus comprising: a first correlator calculating correlation values between a first OFDM symbol of the plurality of OFDM symbols and subsequent OFDM symbols of the plurality of OFDM symbols and outputting a first correlation signal; a second correlator calculating correlation values between a reference OFDM symbol and the subsequent OFDM symbols and outputting a second correlation signal; a third correlator calculating a correlation value between the first correlation signal and the second correlation signal and outputting a third correlation signal; a delay correlator calculating a correlation value between a delay correlation signal obtained by delaying the third correlation signal by a predetermined subcarrier interval and the third correlation signal, and outputting a timing offset information signal; a phase estimator detecting phase components of the timing offset information signal; and a sliding integrator accumulating the detected phase components of the timing offset information signal during a symbol interval, and outputting an average value of the accumulated phase components during the symbol interval as the timing offset of each OFDM symbol of the plurality of OFDM symbols.