Underwater Acoustic Networks: Channel Models and Network Coding based Lower Bound to Transmission Power for Multicast

Details Underwater Acoustic Networks: Channel Models and Network Coding based Lower Bound to Transmission Power for Multicast Underwater Acoustic Networks: Channel Models and Network Coding based Lower Bound to Transmission Power for Multicast

2008-08-30

arxiv.org/abs/0809.0070v1

Computer Science

Information Theory

12 pages, 10 figures, 2 Tables, Accepted to Journal on Selected Areas in Communications (Underwater Communications and Wireles

Scientific paper

The goal of this paper is two-fold. First, to establish a tractable model for the underwater acoustic channel useful for network optimization in terms of convexity. Second, to propose a network coding based lower bound for transmission power in underwater acoustic networks, and compare this bound to the performance of several network layer schemes. The underwater acoustic channel is characterized by a path loss that depends strongly on transmission distance and signal frequency. The exact relationship among power, transmission band, distance and capacity for the Gaussian noise scenario is a complicated one. We provide a closed-form approximate model for 1) transmission power and 2) optimal frequency band to use, as functions of distance and capacity. The model is obtained through numerical evaluation of analytical results that take into account physical models of acoustic propagation loss and ambient noise. Network coding is applied to determine a lower bound to transmission power for a multicast scenario, for a variety of multicast data rates and transmission distances of interest for practical systems, exploiting physical properties of the underwater acoustic channel. The results quantify the performance gap in transmission power between a variety of routing and network coding schemes and the network coding based lower bound. We illustrate results numerically for different network scenarios.

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