Underwater sound high-speed communication method under time-varying channel

The invention provides an underwater sound high-speed communication method under a time-varying channel, and the method comprises the steps: firstly carrying out the cyclic correlation of a resampled Doppler signal and a local Doppler measurement signal, and obtaining a Doppler compensation initial value of Doppler coarse search through the judgment of a maximum correlation value; then, constructing a NelderMead simplex by using a Doppler compensation initial value obtained by Doppler coarse search and a cyclic correlation peak value, and then, carrying out fine Doppler search by adopting a NelderMead algorithm; according to the method, the Doppler compensation value estimated in a rough search and fine search mode is more in line with the real situation and is more accurate, the method is not only suitable for a fast time-varying channel, but also suitable for the situation of a low signal-to-noise ratio, and the performance of underwater sound high-speed OFDM communication is greatly optimized. 本发明提供一种时变信道下