Results 61 to 70 of about 7,251 (248)
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 Turbulence Detection Using Gated Wavefront Sensing Technique
Sensors, 2018 Laser sensing has been applied in various underwater applications, ranging from underwater detection to laser underwater communications. However, there are several great challenges when profiling underwater turbulence effects.
Ying Bi +4 more
doaj +1 more source
The Acoustic System of the Fendouzhe HOV
Sensors, 2021 Due to the strong absorption and attenuation of electromagnetic waves by water, radio communications and global positioning systems are lacking in the deep-sea environment.
Yeyao Liu +10 more
doaj +1 more source
An environmental equalizer for underwater acoustic communications Tested at Hydralab III [PDF]
, 2010 It is known that small changes in source and receiver locations can cause significant changes in underwater acoustic channel impulse responses. At HYDRALAB III an underwater acoustic experiment was conducted to show that a source depth-shift causes a ...
Silva, A. +4 more
core
A multipath fading channel model for underwater shallow acoustic communications
, 2012 In these last years, many studies have focalized on the design of reliable under water acoustic communication systems. However, the ocean acoustic communication channel exhibits strong amplitude and phase fluctuations and the phenomena of diffraction ...
F. Veltri +5 more
core +1 more source
Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems
Advanced Electronic Materials, EarlyView.Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang +9 more
wiley +1 more source
Blue Laser Underwater Optical Visible Light Communication Using Recursive OFDM
Wasit Journal of Engineering SciencesWater covers more than 75% of the earth's surface in the form of the ocean. The ocean investigation is far-fetched because the underwater environment has distinct phenomenal activities.
Sameer Hassan +4 more
doaj +1 more source
Gb/s Underwater Wireless Optical Communications Using Series-Connected GaN Micro-LED Arrays
IEEE Photonics Journal, 2020 High speed wireless communications are highly desirable for many industrial and scientific underwater applications. Acoustic communications suffer from high latency and limited data rates, while Radio Frequency communications are severely limited by ...
Georgios N. Arvanitakis +11 more
doaj +1 more source
Guiding and Manipulating Light Fields in Microstructured Liquid Crystals
Advanced Physics Research, EarlyView.This review summarizes recent advances in guided‐wave optics enabled by microstructured liquid crystal (LC) devices, covering their fundamental material properties, key degree of freedom for dynamic light field manipulations. The advances of linear guided‐wave optics, nonlinear‐optics with spatial optical solitons, and microlasers in LC‐based devices ...
Shan‐shan Chang +2 more
wiley +1 more source
A Novel Fractional Fourier Transform-Based ASK-OFDM System for Underwater Acoustic Communications
Applied Sciences, 2017 A key research area in wireless transmission is underwater communications. It has a vital role in applications such as underwater sensor networks (UWSNs) and disaster detection.
Rami Ashri +2 more
doaj +1 more source