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Vol. 152, No. 5, May 2013, pp. 116-121




AGC Design in Frequency Modulation System for Voice Communication via Underwater Acoustic Channel
1 CHENG En, 1 CHEN Sheng-Li, 2 Li Ye, 1 KE Fu-Yuan, 1* YUAN Fei

1 Key Laboratory of Underwater Acoustic Communication and Marine Information Technology

of the Ministry of Education (Xiamen University), Xiamen, 361005, P. R. China

2 Key Laboratory of Computer Network of Shandong Province, Shandong Computer Science Center, Jinan, 250014, P. R. China

* Tel.: 086-0592-2580143

E-mail: yuanfei@xmu.edu.cn


Received: 8 April 2013   /Accepted: 15 May 2013   /Published: 27 May 2013

Digital Sensors and Sensor Sysstems


Abstract: 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 not only control the bandwidth of the modulated signal but also improve the anti-noise ability integrally.


Keywords: Underwater acoustic communication, FM modulation, Filtering and AGC



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