OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and synchronization method thereof

The invention provides an OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and a synchronization method thereof, which are characterized in that the advanced OFDM technology is used as a transmission scheme in the transmission system. A transmitting terminal creates a training sequence based on conjugated symmetry of sequences, and then, overlays the training sequence on a complete OFDM; and a receiving terminal designs a simply structured synchronization algorithm based on the conjugated symmetry of training sequence to obtain a target function with single sharpness, and then, performs synchronous determination through a predetermined threshold so as to implement quick synchronization of the system. In comparison with the traditional overlaying period training sequence synchronization algorithm, the synchronization algorithm provided by the invention is low in computational complexity and quick in synchronization, can adapt to the digital seismograph data t