Results 21 to 30 of about 7,251 (248)
Underwater optical wireless communications : depth dependent variations in attenuation [PDF]
, 2013 Depth variations in the attenuation coefficient for light in the ocean were calculated using a one-parameter model based on the chlorophyll-a concentration Cc and experimentally-determined Gaussian chlorophyll-depth profiles.
Leeson, Mark S. +2 more
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Sensors, 2019 Underwater acoustic communications are challenging because channels are complex, and acoustic waves when propagating in the ocean are subjected to a variety of interferences, such as noise, reflections, scattering and so on.
Feng Zhou +5 more
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Spectral characterisation of shortened pulse position modulation format [PDF]
, 2010 Shortened pulse position modulation (SPPM) is a new modulation format that has recently been proposed for underwater wireless optical communications. A full spectral characterisation of SPPM is considered and original expressions are presented, which ...
Cryan, R.A.
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Non-Orthogonal Multiple Access-Based Underwater VLC Systems in the Presence of Turbulence
IEEE Photonics Journal, 2022 The promising potential of underwater applications in visible light communication (VLC) systems has recently gained considerable research attention, as an efficient technology for enabling high data rate, massive connectivity, and ultra-low latency ...
Lina Bariah +4 more
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Probe timing optimization for time-reversal underwater communications [PDF]
, 2011 Passive Time Reversal (pTR) is one of the variants of time reversal applicable to digital underwater communications. In passive time reversal a probe-signal is transmitted ahead of the data-signal in order to estimate the channel impulse response for ...
S. M. Jesus +6 more
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Underwater Acoustic Communication Channel Modeling Using Reservoir Computing
IEEE Access, 2022 Underwater acoustic (UWA) communications have been widely used but greatly impaired due to the complicated nature of the underwater environment. In order to improve UWA communications, modeling and understanding the UWA channel is indispensable. However,
Oluwaseyi Onasami +4 more
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Surface Based Underwater Communications [PDF]
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010 In an underwater environment signal propagation for the acoustic channel is subject to major multipath effect. Therefore, most underwater communication schemes require that the position of the transmitter or receiver is fixed while using directional antennas in order to ensure high signal-to-noise ratio.
Emokpae, Lloyd, Younis, Mohamed
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Adaptive Underwater Acoustic Communications [PDF]
, 2010 Underwater wireless networks consist of mobile and static nodes, which usually communicate using the acoustic channel since radio transmissions attenuate rapidly and optical communication is only suitable for short distances. The underwater acoustic channel is plagued with issues of high transmission power requirements, rapidly changing channel ...
Anuj Sehgal, Jürgen Schönwälder
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Weighted Multi-Band Turbo-Coded FSK for Reliable Underwater Communications
Applied Sciences, 2022 Multi-band communication technology allocates the same data to different frequency bands, improving both performance and propagation efficiency. However, since the performance loss in a particular band affects the entire band, the multi-band structure ...
Hyun-Woo Jeong, Ji-Won Jung
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RESEARCH ON UNDERWATER COMMUNICATION AND SIMULATED ASSESSMENT OF MAIN PARAMETERS
Tạp chí Khoa học Đại học Đà Lạt, 2018 Underwater communication and its applications is a research field that has been developing rapidly, extending in many fields such as remote control in the offshore oil industry, calculating environmental pollution, transmitting voices between frogmen ...
Phan Thanh Minh, Nguyễn Ngọc Bình
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