Challenges for efficient communication in underwater acoustic sensor networks
ACM SIGBED Review - Special issue on embedded sensor networks and wireless computing
A MAC protocol for ad-hoc underwater acoustic sensor networks
WUWNet '06 Proceedings of the 1st ACM international workshop on Underwater networks
Medium access control in wireless sensor networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
A DSP implementation of OFDM acoustic modem
Proceedings of the second workshop on Underwater networks
Protocol design issues in underwater acoustic networks
Computer Communications
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In this study, we introduce a novel OFDMA-based MAC protocol for underwater acoustic sensor networks. The design approach of this protocol exploits the multi-path characteristics of a fading acoustic channel. The goal is to convert the channel into parallel independent acoustic sub-channels that undergo flat fading. Communication between node pairs within the network is then done using subsets of these sub-channels thus fully utilizing the available limited bandwidth while avoiding interference completely. We derive the mathematical model for optimal sub-channel selection. We also present the results of the experiments that we conducted to evaluate the new protocol and we compare these results to those of a MAC protocol that is based on the CDMA scheme.