Results 31 to 40 of about 873,936 (270)
Parametric Underwater Communications [PDF]
Proceedings of Meetings on Acoustics, 2012 High performance acoustic underwater communications require high bandwidths for high data rates, low carrier frequencies for low channel attenuation and highly directive transducers. These at first sight contradictory requirements can be satisfied by employing parametric arrays. In this way highly directive radiation, which mitigates multipath and thus
Karsten Wiedmann +2 more
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Underwater Communication System
International Journal for Research in Applied Science and Engineering Technology, 2023 Abstract: Sensor network have since been considered a promising alternative to complement conventional monitoring processes. These networks are relatively affordable and allow measurements to be taken remotely, in real-time and with minimal human intervention. we are going to use a under -water Wireless sensor network system which can transfer multiple
Ankit Sinha +3 more
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Application research of polar coded OFDM underwater acoustic communications
EURASIP Journal on Wireless Communications and Networking, 2023 To further accelerate the practical process of polar codes in underwater acoustic communication (UWC) and improve the reliability and efficiency of underwater data transmission, we first propose a polar code construction method suitable for the ...
Yushuang Zhai +3 more
semanticscholar +1 more source
Re-Evaluation of RF Electromagnetic Communication in Underwater Sensor Networks [PDF]
, 2010 Most underwater wireless networks use acoustic waves as the transmission medium nowadays, but the chances of getting much more out of acoustic modems are quite remote. Optical links are impractical for many underwater applications.
Gordon Dickers +4 more
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Three-Hop Underwater Wireless Communications: A Novel Relay Deployment Technique
IEEE Internet of Things Journal, 2023 Underwater long-distance wireless communication (ULWC) is a critical challenge in many applications, such as marine environmental monitoring, underwater remote control, and underwater navigation, to name a few.
Jiajie Xu +3 more
semanticscholar +1 more source
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
doaj +1 more source
Fast Sparse Bayesian Learning-Based Channel Estimation for Underwater Acoustic OFDM Systems
Applied Sciences, 2022 Harsh underwater channels and energy constraints are the two critical issues of underwater acoustic (UWA) communications. To achieve a high channel estimation performance under a severe underwater channel, sparse Bayesian learning (SBL)-based channel ...
Yong-Ho Cho
doaj +1 more source
Scattering regimes for underwater optical wireless communications using Monte Carlo simulation [PDF]
, 2018 Optical wireless communications has shown tremendous potential for underwater applications as it can provide higher bandwidth and better security compared to acoustic technologies.
Ahmad, Zahir +3 more
core +3 more sources
Covert underwater acoustic communications
The Journal of the Acoustical Society of America, 2010 Low probability of detection (LPD) communications are conducted at a low received signal-to-noise ratio (SNR) to deter eavesdroppers to sense the presence of the transmitted signal. Successful detection at intended receiver heavily relies on the processing gain achieved by employing the direct-sequence spread-spectrum (DSSS) technique.
Jun Ling +4 more
openaire +2 more sources
Underwater acoustic slant range measurements related to weather and sea state [PDF]
, 2018 Underwater range measurements are key factor in underwater acoustic positioning, used in Long Base-Line (LBL) or Ultra Short Base-Line (USBL) computing techniques. These measurements are commonly carried out through acoustic communications between modems
Aguzzi, Jacopo +5 more
core +1 more source