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High bandwidth underwater optical communication
Applied Optics, 2008We report error-free underwater optical transmission measurements at 1 Gbit/s (10(9) bits/s) over a 2 m path in a laboratory water pipe with up to 36 dB of extinction. The source at 532 nm was derived from a 1064 nm continuous-wave laser diode that was intensity modulated, amplified, and frequency doubled in periodically poled lithium niobate ...
Frank, Hanson, Stojan, Radic
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Underwater communications device
The Journal of the Acoustical Society of America, 1980A communications device for use under water by a human speaker. A tubular base member has a mouthpiece located at one open end thereof and an inflatable air bag mounted about another open end thereof. In use, the speaker places the mouthpiece around his mouth to form an air seal therebetween and blows into the air bag to partially inflate it.
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Performance of RF underwater communications operating at 433 MHz and 2.4 GHz
2019 International Conference on Innovative Trends in Computer Engineering (ITCE), 2019The development of Underwater communications networks has become a hot topic in the research over the past few years. Many technologies are promising, however, they suffer from considerable latency, and larger attenuation with distance which degrades the
Salma M. Maher +4 more
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Underwater radio frequency communications
OCEANS 2011 IEEE - Spain, 2011There are actually three different types of data telemetry in the aquatic environment: acoustic, optic and electromagnetic. Table I shows the pros and cons of the different technologies. This paper will concentrate on the use of electromagnetic waves as a carrier through-water, through-ice and through-ground.
Alejandro Palmeiro +3 more
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Underwater communication device
The Journal of the Acoustical Society of America, 1990An underwater speaker system having a pressure equalization system enabling the speaker to operate in its intended fashion over a wide range of water depths, e.g. from two feet up to sixty feet. Water pressure is applied to a diaphragm that forms one wall of a variable volume an internal face of a speaker membrane.
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The Journal of the Acoustical Society of America, 1990
An underwater communicator comprising a transmitter for transmitting acoustical energy between mediums having differing impedance. The transmitter includes first and second ends. The first end is exposed to a first medium while the second end is exposed to a second medium.
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An underwater communicator comprising a transmitter for transmitting acoustical energy between mediums having differing impedance. The transmitter includes first and second ends. The first end is exposed to a first medium while the second end is exposed to a second medium.
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Underwater communication goes cognitive
OCEANS 2008, 2008Underwater acoustic channel is the most challenging channel in the world due to its time varying and frequency-selective characters. These facts obstruct the realization of most of intelligent and high bit rate underwater communication systems. Cognitive underwater communication systems build up rules of modulation method and receiver algorithm over ...
Wang Yonggang +3 more
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Modeling Underwater Communication Links
2008 Second International Conference on Sensor Technologies and Applications (sensorcomm 2008), 2008Design and operation of underwater acoustic communications systems require a capacity to model the acoustic preparation conditions under various environmental conditions. For the frequencies of interest to most applications in connection to ocean sensor networks ray tracing technique is normally the preferred method.
Jens M. Hovem +3 more
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Data Muling Approach for Long-Range Broadband Underwater Communications
2019 International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), 2019Autonomous Underwater Vehicles (AUVs) are widely used as a cost-effective mean to carry out underwater missions. During long-term missions, AUVs may collect large amounts of data that usually needs to be sent to shore.
Filipe B. Teixeira +3 more
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