Abstract
Coverage in an underwater acoustic sensor network is directly related to successful sensing and communication among battery-powered nodes with strictly limited lifetime. It is impractical to change or recharge batteries in most of the underwater applications. Moreover, major power consumption of the sensor nodes occur during acoustic transmission. In this regard, acoustic backscatter networking emerges as a promising communication technique, where nodes transmit data by modulating and reflecting a fraction of an incident carrier signal from an acoustic source, which removes the lifetime limitation due to depletion of batteries. In this study, we introduce and analyze the feasibility of Underwater Acoustic Backscatter Networks (UABN). We derive equations for the rectified voltage and harvested power at a UABN node. We investigate the communication range by calculating the maximum distance at which UABN nodes can be powered using practical transducer assumptions and viable transmission power levels. Communication coverage, which is a measure of successful data collection from all nodes in the event field, determines the performance of UABN. We analytically study interference-free source deployment for UABN coverage in terms of source power, range, transmission frequency, network size, and node characteristics. Numerical examples demonstrate that UABN operation is realizable with a feasible number of sources. An event field of size 0.04 km\(^2\) can be covered with a single directional source transmitting with 1000 W at 5 kHz. As long as the transmission frequency does not exceed 100 kHz, only 5 sources are sufficient for interference-free coverage using transmission power levels below 500 W.
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Acknowledgements
Authors are thankful to the anonymous reviewers, the editor-in-chief Prof. Xuemin Shen, and Ms. Nuray Özer Bereketli from the Department of Electrical and Electronics Engineering at Middle East Technical University, Ankara, Turkey, for their valuable recommendations to improve the quality, correctness, presentation and readability of the manuscript.
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Bereketli, A. Interference-Free Source Deployment for Coverage in Underwater Acoustic Backscatter Networks. Peer-to-Peer Netw. Appl. 15, 1577–1594 (2022). https://doi.org/10.1007/s12083-022-01312-9
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DOI: https://doi.org/10.1007/s12083-022-01312-9