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

Abstract

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 complexity, strong anti-interference, anti-multipath and anti-Doppler frequency offset, and can effectively solve the problem of unreliable signal transmission caused by underwater multipath, Doppler frequency offset and noise.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to an adaptive multi-standard underwater acoustic communication system and method. Background technique [0002] Underwater acoustic communication technology is widely used in the military field, such as for submarine three-dimensional observation network, marine tactical alert, marine emergency monitoring, disaster prevention, underwater mobile carrier positioning and navigation, and mutual communication. In the civilian field, such as seabed data recovery, underwater vehicle positioning and data communication, communication between marine detection equipment and marine ships or shore stations, etc. In recent years, in order to speed up marine research and develop marine economy, my country's investment in marine research has been increasing, and in-depth research on the ocean and the support of underwater acoustic communication technology are ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned system using multiple signal modulation schemes has a complex structure and is cumbersome to implement.

[0006] In view of the problems existing in the above-mentioned existing solutions, the shortcomings of single-standard underwater acoustic communication, and the disadvantages of the existing multi-standard underwater acoustic communication system with complex structure, it is necessary to study a highly reliable and capable of single-carrier / multi-carrier modulation Technology switching multi-standard underwater acoustic communication system

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