Results 161 to 170 of about 1,820,656 (215)

Integrated optomechanical ultrasonic sensors with nano-Pascal-level sensitivity. [PDF]

Light Sci Appl
Cao X, Yang H, Wang M, Hu ZG, Wu ZL, Wang Y, Liu JF, Zhou X, Li J, Lao C, Yang QF, Li BB.   +11 more
europepmc   +1 more source

Cooperative underwater acoustic communications. [PDF]

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
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Synchronization techniques for underwater acoustic communications

International Journal of Communication Systems, 2023
SummaryUnderwater acoustic channel is a challenging medium for communication due to the presence of significant multipath, high noise, frequency‐dependent propagation loss, and high and non‐uniform Doppler spread. Doppler shift is non‐negligible in underwater communication due to the low velocity of underwater signals.
T. P. Sameer Babu, P. M. Ameer, Ravinder David Koilpillai   +2 more
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Shallow Underwater Acoustic Massive MIMO Communications

IEEE Transactions on Signal Processing, 2021
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Wu, W, Gao, X, Sun, C, Li, GY, Li, G
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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
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Network-assisted underwater acoustic communications

Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems - WUWNet '12, 2012
For 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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Underwater acoustic communications

Proceedings of OCEANS '93, 2002
The 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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Signal processing for underwater acoustic communications

IEEE Communications Magazine, 2009
The 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, Jill K. Nelson, Suleyman Serdar Kozat   +2 more
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Cooperative Transmission for Underwater Acoustic Communications

2008 IEEE International Conference on Communications, 2008
Underwater 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, Sun, Yan Lindsay, Shi, Hongyuan   +2 more
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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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