Abstract
Modern communication system is restricted by the underwater communication. the underwater acoustic channel is probably one of the most complex environments for data communication, the main reasons of bit-error-rate in underwater acoustic communication are serious multipath fading and Dopppler shift, the direction of underwater acoustic communication's development is the data transmission with low power, long distance, high secret, low signal noise ratio(SNR)detection and high secure. And design a simple digital modulator's circuit base on AD9852 and μC/OS-II, and it has been realized successfully in laboratory, It can supply the request of underwater acoustic digital communication on medium ratio transmission.
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