OFDM DAB DIGITAL AUDIO BROADCASTING SYSTEM BASED ON OFDM AND METHOD OF MODE AND FRAME DETECTION USING THE SAME

摘要

The present invention relates to an OFDM-based DAB system and a mode and a frame synchronization method using the same, and in a mode and a frame synchronization method using an OFDM-based DAB system, the receiving end of the DAB system comprises: Calculating a differential autocorrelation function value for each of the plurality of candidate transmission modes, calculating a candidate transmission mode having the largest differential autocorrelation function value as the specific transmission mode, Calculating a time index of a maximum value or a minimum value by applying the estimated specific transmission mode to the differential autocorrelation function to estimate a time index of the maximum value or the minimum value, And estimating a frame start point using the motion vector. According to the present invention, it is possible to secure more reliable mode and frame start point detection performance as compared with the conventional transmission mode and frame start point detection method. Also, according to the present invention, synchronization can be performed quickly and efficiently by simultaneously estimating a transmission mode and a frame start point.