Patent ID: 7746941

Claim:
A synchronization apparatus for symbol timing synchronization of an OFDM-FDMA/CDMA/TDMA system having a preamble structure in which patterns are repeated three times in time domain, the synchronization apparatus comprising: an auto-correlator for calculating an auto-correlation value of a received signal and a signal delayed by N p (N p =N FFT /3 where N FFT is an FFT size); a power detector for calculating power of the received signal in order to normalize the auto-correlation value; a timing metric/normalizer for normalizing the auto-correlation value by dividing the auto-correlation value by the calculated power to obtain a timing metric; and a peak detector for finding a peak value of the timing metric by measuring one frame while moving by one sample from an arbitrary staffing point and estimating a frame starting position and an initial symbol timing, wherein the auto-correlator calculates the auto-correlation value by applying (2N p −1)+N cp as correlation length, where N cp is a length of a guard interval.