Results 131 to 140 of about 1,479 (180)
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Signal processing for underwater acoustic communications
IEEE Communications Magazine, 2009The performance and complexity of signal processing systems for underwater acoustic communications has dramatically increased over the last two decades. With its origins in noncoherent modulation and detection for communication at rates under 100 b/s, phase-coherent digital communication systems employing multichannel adaptive equalization with ...
Andrew C Singer +2 more
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Cooperative underwater acoustic communications.
IEEE Commun. Mag., 2013Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Suhail Al-Dharrab +2 more
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Underwater acoustic communications
Proceedings of OCEANS '93, 2002The paper first attempts to provide a framework for the underwater acoustic communication system. An acoustic frequency band allocation, analogous to that used by radio engineers, is proposed. Similarly, the "shallow" channel is defined and the conditions pertaining to "high" bit rate explored.
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Network-assisted underwater acoustic communications
Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems - WUWNet '12, 2012For many underwater acoustic applications, the source and receiver systems carry a single transducer antenna. The lack of spatial diversity makes it difficult to carry out phase coherent communications. Using distributed nodes of an underwater acoustic network, this paper address phase coherent underwater acoustic communications using source diversity.
T. C. Yang 0001, Kevin D. Heaney
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Cooperative Transmission for Underwater Acoustic Communications
2008 IEEE International Conference on Communications, 2008Underwater acoustic channels normally have low data rate, long propagation delay, severe multipath effect, and time varying fading. Cooperative transmission is a new wireless communication technique in which diversity gain is achieved by utilizing relay nodes as virtual antennae.
Han, Zhu +2 more
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Bidirectional equalization for underwater acoustic communication
The Journal of the Acoustical Society of America, 2012The 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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Efficient use of bandwidth for underwater acoustic communication
The Journal of the Acoustical Society of America, 2013In a recent shallow water experiment, acoustic communication transmissions were carried out over the 10 to 32 kHz band in ∼100 m deep water over a 3 km range. A natural question is how best to utilize that bandwidth. In one multiband approach discussed previously, the band was divided into four smaller subbands that were processed independently using ...
H C, Song, W S, Hodgkiss
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Beyond underwater acoustic communications
OCEANS 2011 IEEE - Spain, 2011The ability to communicate underwater using acoustic energy in place of electromagnetic energy is rapidly becoming commonplace. Indeed, vendors and academic researchers in many advanced countries are pursuing the development of acoustic modems. The emphasis often varies among these efforts: some, especially academic researchers, focus on increased ...
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Scalable OFDM design for underwater acoustic communications
2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 2008Multicarrier modulation in the form of OFDM has been actively pursued for underwater acoustic communication recently. In this paper, we present a desirable property of OFDM that one signal design can be easily scaled to fit into different transmission bandwidths with negligible changes on the receiver.
Baosheng Li +3 more
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Asynchronous multiuser underwater acoustic communications (L)
The Journal of the Acoustical Society of America, 2012An asynchronous multiuser system is proposed to support multiple-access underwater communications without the use of code-division multiple-access or a feedback channel. The rich multipath channels experienced by spatially separated users will be sufficient to ensure separation of collided packets at the base station. The iterative receiver will employ
S E, Cho, H C, Song, W S, Hodgkiss
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