Browsing by Author "Walree, Paul van"
Now showing items 1-13 of 13
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Channel sounding for acoustic communications : techniques and shallow-water examples
Walree, Paul van (2011-04-11)This report deals with channel soundings, which are measurements of the time-varying impulse response of a propagation medium. The treatment focuses on underwater acoustic channels, the characterization of which is ... -
Coherent high-speed acoustic communication inside a commercial atlantic salmon pen
Rudander, Jacob; Husøy, Thor; Walree, Paul van; Orten, Pål (2020-06-07)Fish telemetry is a potential method to monitor the well-being of farmed fish, where a reference group of fish are equipped with sensors tags that oversee their health and wirelessly transmit the data. Many fish must be ... -
Comparing RLS and LMS adaptive equalizers for large hydrophone arrays in underwater acoustic communication channels
Rudander, Jacob Hiden; Husøy, Thor; Orten, Pål; Walree, Paul van (2019-10-14)There is an expected growth in underwater acoustic data traffic. To meet the demand of high data throughput, a migration towards the very high frequency band (>100 kHz) will be necessary. The increment in frequency comes ... -
In situ performance prediction of a coherent acoustic modem in a reverberant environment
Walree, Paul van; Colin, Mathieu E G D (2021-07-28)A channel sounding and communications experiment was performed in the Oslofjord, using eight bottom-mounted instrument units deployed in a network configuration. Five units were equipped with a software-defined 4–8-kHz ... -
A Modular Smart Ocean Observatory for Development of Sensors, Underwater Communication and Surveillance of Environmental Parameters
Bergh, Øivind; Danre, Jean-Baptiste; Stensland, Kjetil; Lima, Keila; Nguyen, Ngoc Thanh; Heldal, Rogardt; Kristensen, Lars Michael; Oyetoyan, Tosin Daniel; Graves, Inger; Sætre, Camilla; Skålvik, Astrid Marie; Tomasi, Beatrice; Henriksen, Bård; Holstad, Marie Bueie; Walree, Paul van; Altamiranda, Edmary; Bjerke, Erik; Husøy, Thor Storm; Henne, Ingvar; Wehde, Henning; Stiansen, Jan Erik (2024-10-10)The rapid growth of marine industries has emphasized the focus on environmental impacts for all industries, as well as the influence of key environmental parameters on, for instance, offshore wind or aquaculture performance, ... -
Propagation and scattering effects in underwater acoustic communication channels
Walree, Paul van (2013)Systematic measurements were performed to characterize shallow-water acoustic propagation channels for applications in the field of underwater communications. The survey was conducted in northern Europe and covers the ... -
Ultrawideband underwater acoustic communication channels
Walree, Paul van; Otnes, Roald Wilhelm (2013)Traditional channel models for communications research are designed for narrowband systems. Underwater acoustic communication systems use a bandwidth that is not small compared with the center frequency of the signal and ... -
Under-ice mid-frequency acoustic transmissionand communication in two Arctic Oceanenvironments
Tollefsen, Dag; Walree, Paul van; Jenserud, Trond; Forsmo, Vidar (2023-02-23)This paper presents data from mid-frequency (4−8 kHz) under-ice acoustic transmission and communication experiments in the Nansen Basin and in the Beaufort Sea of the Arctic Ocean. Measured impulse responses to range ~10 ... -
Underwater Acoustic Network Simulation With Lookup Tables From Physical-Layer Replay
Otnes, Roald; Walree, Paul van; Buen, Helge; Song, Heechun (2015)An underwater acoustic network simulation methodology is presented that is based on lookup tables (LUTs) with physical-layer error ratios. These LUTs are prepared with a validated replay channel simulator, which is here ... -
Validation of replay-based underwater acoustic communication channel simulation
Otnes, Roald Wilhelm; Walree, Paul van; Jenserud, Trond (2013)This paper discusses validation methods for underwater acoustic communication channel simulators, and validates direct and stochastic replay of underwater acoustic communication channels as implemented in a channel simulator ... -
Very-High-Frequency Single-Input–Multiple-Output Acoustic Communication in Shallow Water
Rudander, Jacob Hiden; Walree, Paul van; Husøy, Thor; Orten, Pål (2018)Very-high-frequency (VHF) underwater acoustic communication is a relatively unexplored terrain, but its importance is expected to increase with the growing demands for larger bandwidths and higher data rates. Knowledge of ... -
The Watermark benchmark for underwater acoustic modulation schemes
Walree, Paul van; Socheleau, François-Xavier; Otnes, Roald Wilhelm; Jenserud, Trond (2017)Watermark is a freely available benchmark for physical-layer schemes for underwater acoustic communications. It allows researchers to test and compare algorithms for the physical layer under realistic and reproducible ... -
The Watermark manual and user's guide - version 1.0
Walree, Paul van; Otnes, Roald; Jenserud, Trond (2016-11-29)Watermark is a benchmark for physical-layer schemes for underwater acoustic communications. It allows researchers and modem manufacturers to develop, test and compare algorithms for the physical layer under highly realistic ...