Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Acoustic communications"”.
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A distributed approach to underwater acoustic communications
A novel distributed underwater acoustic networking (UAN) protocol suitable for ad-hoc deployments of both stationary and mobile nodes dispersed across a relatively wide coverage area is presented. Nodes are dynamically clustered in a distributed manner based on the estimated position of one-hop …
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Underwater acoustic communications and adaptive signal processing
… proposes three new algorithms for underwater acoustic wireless communications. One is a new tail-biting circular MAP decoder for full tail-biting convolution (FTBC) codes for very short data blocks intended for Internet of Underwater Things (IoUT). The proposed algorithm was evaluated by ocean …
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A distributed approach to underwater acoustic communications
Thesis (S.M.)--Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, the Woods Hole Oceanographic Institution), 2003.
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Inter-carrier interference mitigation for underwater acoustic communications
… data rate through the ocean is challenging. Such communications must be acoustic in order to travel long distances. The underwater acoustic channel has a long delay spread, which makes orthogonal frequency division multiplexing (OFDM) an attractive communication scheme. However, the underwater …
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High data rate acoustic communications with nonideal channels
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Lorentz actuators for turbulence control and underwater acoustic communications
… are the turbulence control and underwater acoustic communication fields. The ability to control turbulence is directly associated with controlling drag. Shipping industries and naval institutions are constantly seeking ways to reduce drag on marine vessels. A reduction in drag would have …
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Spatiotemporal processing and time-reversal for underwater acoustic communications
High-rate underwater acoustic communication can be achieved using transmitter/receiver arrays. Underwater acoustic channels can be characterized as rapidly time-varying systems that suffer severe Inter Symbol Interferences (ISI) caused by multi-path propagation. Multi-channel combining and …
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A phased array sonar for an underwater acoustic communications system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1980.
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Undersea navigation of a glider UUV using an acoustic communications network
The US Navy is developing Seaweb undersea acoustic networking technology to enable distributed autonomous ocean sensors. An Unmanned Undersea Vehicle (UUV) can operate as a mobile node among the grid in the conduct of its own mission, using the fixed nodes as navigation reference points. The fixed …
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Harvesting time-frequency-space diversity with coded modulation for underwater acoustic communications
… is to design a low-complexity, high data-rate acoustic communications system with robust performance under various channel conditions. The need for robust performance emerges because underwater acoustic (UWA) channels have time-varying statistics, thus a coded modulation scheme optimally …
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Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
… of this collaboration is often limited by communications: throughput, latency, and ease of reconfiguration. This thesis argues that improved communication on intelligent marine robotic agents can be gained from acting on knowledge gained by improved awareness of the physical acoustic link …
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Environmental effects of the Beaufort Lens on underwater acoustic communications during Arctic operations
… presence of the Beaufort Lens is changing the acoustic propagation paths throughout the Arctic region. Here a network of buoys were employed to communicate with an Autonomous Undersea Vehicle (AUV) while it operated under the ice throughout the Beaufort Lens with the goal of achieving near GPS …
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Environmental Effects of the Beaufort Lens on Underwater Acoustic Communications during Arctic Operations
… presence of the Beaufort Lens is changing the acoustic propagation paths throughout the Arctic region. Here a network of buoys were employed to communicate with an Autonomous Undersea Vehicle (AUV) while it operated under the ice throughout the Beaufort Lens with the goal of achieving near GPS …
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Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
… of this collaboration is often limited by communications: throughput, latency, and ease of reconfiguration. This thesis argues that improved communication on intelligent marine robotic agents can be gained from acting on knowledge gained by improved awareness of the physical acoustic link …
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New method of polar channel coding for reducing the bit error rate with low complexity in the F-OFDM underwater acoustic communications
Underwater Acoustic (UWA) communication system plays a crucial role in various applications and contributes significant performance in comparison to other communication systems. UWA is essential in various applications such as oceanographic, oil exploration, military applications etc. However, it …
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Underwater sound propagation and acoustic communication in a time-varying shallow estuarine environment
… other coastal engineering activities. Underwater acoustic technology offers a series of effective applications and technical supports for real-time monitoring and long-term preservation of the nature environment and ecosystem in these regions. However, estuaries are shallow waters with complicated …
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Implementation of a wireless underwater video link
… software defined Reconfigurable Modem (R-Modem) acoustic communications platform. We have demonstrated a test implementation of live streaming video with a digital camera connected to an R-Modem transceiver; and explored a range of tuning parameters for the video link.
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Low frequency active sonar performance in the Arctic Beaufort Lens
A newly discovered double ducted acoustic environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower duct impacts the propagation of various active signals used commonly for …
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Low frequency active sonar performance in the Arctic Beaufort Lens
A newly discovered double ducted acoustic environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower duct impacts the propagation of various active signals used commonly for …
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Adaptive reception for underwater communications
… the radio channel is replaced by an underwater acoustic channel, which is strongly dependent on the physical properties of the ocean medium and its boundaries, the link geometry and the ambient noise. Traditional acoustic communications have involved a priori matching of the signaling parameters …
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