Research on Synchronization Technology for OFDM Underwater Acoustic Communication System

摘要

The underwater acoustic channel is a kind of dual-selective fading channel, which has the characteristics of time-varying, space-variation and frequency-variation. It has serious multipath effect and Doppler effect. The characteristics of severe multipath interference, large background noise, large delay spread, and narrow usable bandwidth are the main obstacles to get the performance of high-speed, reliable acoustic communications. Orthogonal Frequency Division Multiplexing (OFDM) technology is a modulation technique with high spectrum utilization and has the advantage of strong anti-multipath capability, and has become a common technique to solve these problems. But another problem is that the OFDM device is very sensitive to synchronization errors. Synchronization errors will have a serious impact on OFDM communication systems and become one of the key technologies of OFDM. Therefore, it is of great practical significance to study OFDM synchronization techniques in underwater acoustic channels. This paper mainly studies the application of OFDM synchronization algorithm in underwater wireless communication under underwater acoustic channels.