Browsing by Author "Walree, Paul van"
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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 ... -
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 ...