Results 71 to 80 of about 549 (116)

Orthogonal Frequency Division Diversity and Multiplexing for 6G OWC: Principle and Underwater Use Case

Photonics
In this paper, we, for the first time, propose and demonstrate an orthogonal frequency division diversity and multiplexing (OFDDM) scheme for the sixth-generation (6G) underwater optical wireless communication (UOWC) systems.
Jiamin Chen, Chen Chen, Zhihong Zeng, Min Liu, Jia Ye, Cuiwei He, Shenjie Huang, H. Y. Fu, Harald Haas   +8 more
doaj   +1 more source

Noise suppression due to annulus shaping of an inverted-velocity-profile coaxial nozzle [PDF]

An inverted velocity profile coaxial nozzle for use with supersonic cruise aircraft produces less jet noise than an equivalent conical nozzle. Furthermore, decreasing the annulus height (increasing radius ratio with constant flow) results in further ...
Goodykoontz, J., Vonglahn, U.
core   +1 more source

Adaptive Beam Steering and Divergence Control for Underwater Optical Wireless Communication Using Reinforcement Learning

IEEE Photonics Journal
Underwater optical wireless communication (UOWC) is a promising technology enabling high-speed, low-latency communication for beyond 5G/6G systems. However, UOWC faces significant challenges due to the complex nature of the underwater channel, including ...
Takumi Ishida, Chedlia Ben Naila, Hiraku Okada   +2 more
doaj   +1 more source

High Energy Benthic Boundary Layer Experiment (HEBBLE): Preliminary program plan and conceptual design [PDF]

Deep sea processes of flow-sediment interaction, particularly the role of high energy ocean bottom current events in forming the seafloor topography, transporting material, and mixing the bottom of the water column are examined.
Frewing, K.
core   +1 more source

Low-PAPR and Low-Complexity Transmission Schemes for DHT-Based Underwater Optical Wireless Systems

IEEE Photonics Journal
This paper presents a low-complexity, low-peak-to-average power ratio (PAPR) transmission scheme for discrete Hartley transform (DHT)-based underwater optical wireless communication (UOWC) systems, termed LPC-DHT-OFDM.
Wei-Wen Hu
doaj   +1 more source

An Underwater Multi-User Communication System Using Photomultiplier-Tube-Based Photon Detector With Dead-Time Effect and Shot Noise

IEEE Photonics Journal
We investigate detection for practical photon-counting receivers in underwater optical wireless communication (UOWC) systems, where dead-time effects and multi-user interference (MUI) pose significant challenges.
Fanghua Li, Xiaolin Zhou, Yongkang Chen
doaj   +1 more source

Underwater Optical Wireless Communications with Chromatic Dispersion and Time Jitter

Computation, 2019
The obsolete communication systems used in the underwater environment necessitates the development and use of modern telecommunications technologies.
George D. Roumelas, Hector E. Nistazakis, Argyris N. Stassinakis, Christos K. Volos, Andreas D. Tsigopoulos   +4 more
doaj   +1 more source

Physical-Layer Security in Mixed UOWC-RF Networks With Energy Harvesting Relay Against Multiple Eavesdroppers

IEEE Open Journal of the Communications Society
In this study, physical layer security (PLS) in a dual-hop underwater optical wireless communication (UOWC)-radio frequency (RF) network under the intruding attempts of multiple eavesdroppers via RF links is considered. An intermediate decode-and-forward
Moloy Kumar Ghosh, Milton Kumar Kundu, MD. Ibrahim, A. S. M. Badrudduza, MD. Shamim Anower, Imran Shafique Ansari, Annie Solomon, Sumit Chakravarty, Imtiaz Ahmed, Heejung Yu   +9 more
doaj   +1 more source

Over 700 MHz –3 dB Bandwidth UOWC System Based on Blue HV-LED With T-Bridge Pre-Equalizer

IEEE Photonics Journal, 2019
To achieve a good balance among the raw modulation bandwidth, the output optical power, and the dynamic swing range, three small GaN-based blue light-emitting diode (LED) cells are cascade interconnected on chip to form a 9 V HV-LED.
Ziying Zhang, Yuanjia Lai, Junlong Lv, Pan Liu, Dongdong Teng, Gang Wang, Lilin Liu   +6 more
doaj   +1 more source

Performance Analysis of a Dual-Hop FSO–Vertical UOWC Link for Seamless Air-to-Underwater Connectivity

IEEE Open Journal of the Communications Society
In this paper, an analytical model is proposed for a dual-hop Free Space Optical (FSO) and vertical Underwater Optical Wireless Communication (UOWC) system designed to achieve seamless connectivity between air and underwater environments.
Savidhan Shetty C S, Praveen Kumar, Ramavath Prasad Naik, G. Saravanan, G. D. Goutham Simha   +4 more
doaj   +1 more source