Patent ID: 7058151

Claim:
A frequency and symbol timing synchronization apparatus for achieving frequency synchronization and symbol timing synchronization of an orthogonal frequency division multiplexed (OFDM) signal, the apparatus comprising: an autocorrelation unit for receiving data including a synchronizing symbol made up of at least three identical synchronizing signals, delaying the received data by a predetermined delay amount, performing autocorrelation between the received data and the delayed data, normalizing an autocorrelated value, and outputting a normalized autocorrelated value; a comparator for comparing the normalized autocorrelated value with a predetermined threshold value; a peak flat detector for detecting as a flat section a section where the normalized autocorrelated value is equal to or greater than the threshold value; a frequency offset estimator for estimating a frequency offset within the flat section to obtain a frequency offset value; a frequency offset compensation unit for compensating for the frequency offset of a received signal using the frequency offset value; a cross correlation unit for performing cross correlation using a frequency offset-compensated signal and a reference signal, and normalizing the cross-correlated value to output a normalized cross-correlated value; and a symbol timing synchronization unit for detecting a point where the cross-correlated value is maximum, and performing symbol timing estimation, thereby performing symbol timing synchronization.