Results 201 to 210 of about 1,366,396 (241)

Linear optoacoustic underwater communication

Applied Optics, 2005
The linear mechanism for optical-to-acoustic energy conversion is explored for optoacoustic communication from an in-air platform or surface vessel to a submerged vessel such as a submarine or unmanned undersea vehicle. The communication range that can be achieved is addressed.
Fletcher, Blackmon, Lee, Estes, Gilbert, Fain   +2 more
openaire   +2 more sources

Cooperative underwater acoustic communications.

IEEE Commun. Mag., 2013
This article presents a contemporary overview of underwater acoustic communication (UWAC) and investigates physical layer aspects on cooperative transmission techniques for future UWAC systems. Taking advantage of the broadcast nature of wireless transmission, cooperative communication realizes spatial diversity advantages in a distributed manner.
Suhail Al-Dharrab, Murat Uysal, Tolga M. Duman   +2 more
openaire   +3 more sources

Filterbank multicarrier for underwater communications

2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2011
Underwater acoustic (UWA) communication has been the topic of many recent research publications. Because of small ratio of the carrier frequency over the signal bandwidth, UWA channels may be categorized as super broadband channels. UWA channels are also highly dispersive in both time (because of widely spread multipaths) and frequency (because of fast
Pooyan Amini, Rong-Rong Chen, Behrouz Farhang-Boroujeny   +2 more
openaire   +2 more sources

Underwater Electric Field Communication

Proceedings of the International Conference on Underwater Networks %Systems - WUWNET '14, 2014
Underwater communications receive more attention with rising need for autonomous underwater vehicles (AUV) and underwater infrastructure. Numerous applications e.g. video streams often require only a short-range wireless transmission up to several meters in seawater with high data rates up to several megabit per second.
Tim Esemann, Gunther Ardelt, Horst Hellbrück   +2 more
openaire   +1 more source

OFDMA for underwater acoustic communications

2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2011
We investigate the possibility of using orthogonal frequency division multiple access (OFDMA) for design of efficient underwater acoustic (UWA) networks. The major challenge for the OFDMA-based UWA communication systems is the Doppler-induced frequency scaling, which may cause severe intercarrier interference (ICI), and depending on the particular user
Kai Tu, Tolga M. Duman, Milica Stojanovic, John G. Proakis   +3 more
openaire   +2 more sources

Underwater communication system

The Journal of the Acoustical Society of America, 2010
When a pressure wave hits the sea bottom, or another object, reflected signal is transmitted back and is detected by the system. Transmission underwater is limited by frequency and other causes. Information lost can be measured in parameters like range, accuracy, and reliability. The sound radiated from a source is propagated in the water.
SKROBANEK GERALD, DISTEFANO GIOVANNI
openaire   +5 more sources

Underwater Communication with IDMA Scheme

2014
Underwater communication finds numerous application including oceanographic data collection, pollution, monitoring, offshore exploration, disaster prevention, assisted navigation, tactical, surveillance, and mine reconnaissance. The enabling technology for these applications is acoustic wireless networking.
Tanuja Pande, Kulbhushan Gupta, M. Shukla, Prachi Tripathi, Ashutosh Singh   +4 more
openaire   +1 more source

Bidirectional equalization for underwater acoustic communication

The Journal of the Acoustical Society of America, 2012
The bidirectional decision feedback equalizer (BiDFE) that combines the outputs of a conventional decision feedback equalizer (DFE) and backward DFE can improve the performance of the conventional DFE by up to 1–2 dB based on simulations. In this letter, the BiDFE concept is extended to multichannel time reversal communications involving a DFE as a ...
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Underwater acoustic communications

IEEE Communications Magazine, 1982
Azizul H. Quazi, William L. Konrad
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Underwater communications device

The Journal of the Acoustical Society of America, 1980
A 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.
openaire   +1 more source