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The FM modulation improves the anti-interference ability by sacrificing the bandwidth of the communication channel. In the underwater acoustic communication, as the bandwidth of the communication channel is very limited, the theory and experiment study show that if we are not deal with the original signal, the modulated signal cannot be transmitted through the underwater channel. In the research of underwater FM system, we find a better way to filtering and AGC. Adding filtering and AGC can notdoaj:579218549bc248fa88fdce2351e6b08c fatcat:qsednwd5ybhfpewufjdtcotmne