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The requirements of multimedia underwater monitoring applications with heterogeneous traffic demands in terms of bandwidth and end-to-end reliability are considered in this paper. To address these requirements, a new medium access control protocol named UMIMO-MAC is proposed. UMIMO-MAC is designed to - adaptively leverage the tradeoff between multiplexing and diversity gain according to channel conditions and application requirements; select suitable transmit power to reduce energy consumption; and efficiently exploit the UW channel, minimizing the impact of the long propagation delay on the channel utilization efficiency.
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