Self-adaptive multi-mode underwater acoustic communication system and method

The present invention relates to a self-adaptive multi-mode underwater acoustic communication system and method, the method comprises: generating different modulation modes to modulate signals according to spread spectrum and OSDM (orthogonal signal division multiplexing) modulation techniques; wherein a transmitting terminal of the communication system includes a modulation mode selection module,a digital modulation module, a spread spectrum modulation module, an OSDM modulation module, and a data framing module, and a receiving terminal includes a synchronization module, a Doppler compensation module, a channel equalization module, and a modulation mode determination module and corresponding demodulation modules. The system can change self-adaptive signal modulation methods according tochanges of an underwater acoustic channel, and realize free switching of a single-carrier modulation mode and the multi-carrier modulation mode. The self-adaptive multi-mode underwater acoustic communication system has low co