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In this paper, the authors present a Networked Acoustic Modem System (NAMS) by integrating a high-speed OFDM modem and a comprehensive underwater network protocol stack for underwater applications. This integrated system allows different underwater network protocols to run on top of the OFDM modem platform and can provide high-speed, reliable and efficient communications in underwater environments. Underwater acoustic networks are generally characterized by long propagation delays, acoustic channels and low available bandwidth, which impose significant challenges for underwater communications. Effective and reliable communications under water require two critical components, namely an efficient acoustic communication link and a well-designed underwater network protocol stack.
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