Results 31 to 40 of about 13,201,500 (307)

Optical Free-Space Communication on Earth and in Space regarding Quantum Cryptography Aspects [PDF]

, 2010
Mobile FSO Communication links have gained signi cant at- tention over the last years due to their increasing maturity. They are used in point to point link scenarios where the high gain in power efficiency and datarate is crucial, compared to state-of ...
Fuchs, Christian, Giggenbach, Dirk, Christian Fuchs, Dirk Giggenbach   +3 more
core   +1 more source

Enhanced Neural Architecture for Real-Time Deep Learning Wavefront Sensing

Sensors
To achieve real-time deep learning wavefront sensing (DLWFS) of dynamic random wavefront distortions induced by atmospheric turbulence, this study proposes an enhanced wavefront sensing neural network (WFSNet) based on convolutional neural networks (CNN).
Jianyi Li, Qingfeng Liu, Liying Tan, Jing Ma, Nanxing Chen   +4 more
doaj   +1 more source

Buffer-Aided Max-Link Relaying for Free Space Optical Communication With Delay Constraints

IEEE Photonics Journal, 2022
In this paper, we introduce the concept of buffer-aided cooperative relaying for a free-space optical (FSO) communication system. The proposed FSO system consists of $K$ decode-and-forward(DF) relays, each equipped with a buffer of size $L$. The proposed
Ashish Kant Shukla, Manav R. Bhatnagar
doaj   +1 more source

Experimental study of bit error rate of free space optics communications in laboratory controlled turbulence [PDF]

, 2010
This paper reports experimental results for the performance of an free space optical (FSO) communication link employing different modulation schemes under the influence of the atmospheric scintillation.
Z. Ghassemlooy, E. Leitgeb, Adebanjo, Olusegun, O. Adebanjo, S. Ansari, S. Rajbhandari, Ghassemlooy, Zabih, Ansari, S., Leitgeb, Erich, Rajbhandari, Sujan, H. Le-Minh, Ijaz, Muhammad, M. Ijaz, Le Minh, Hoa   +13 more
core   +1 more source

Lambertian source modelling of free space optical ground-to-train communications [PDF]

, 2012
There is a increasing demand for high speed data services while travelling on trains and other means of public transportation. Hence, an alternative technology to radio frequency (RF) communications called free space optics (FSO) could be used to provide
Ghassemlooy, Zabih, H. Le Minh, Paudel, Rupak, R. Paudel, Z. Ghassemlooy, E. Leitgeb, Leitgeb, Erich, Rajbhandari, Sujan, S. Rajbhandari, Le Minh, Hoa   +9 more
core   +1 more source

Quantum Relay-Assisted Free-Space Optical Communication

IEEE Photonics Journal
Relay-based quantum communication utilizes intermediate nodes to extend the transmission distanceof quantum signals and mitigate the masking effect caused by obstacles or turbulence in free-space optical (FSO) channels.
Manav R. Bhatnagar, M. K. Arti, Kushagra Bhatnagar   +2 more
doaj   +1 more source

Performance of BPSK subcarrier intensity modulation free-space optical communications using a log-normal atmospheric turbulence model [PDF]

, 2010
In this paper, we present simulation results for the bit error rate (BER) performance and the fading penalty of a BPSK - subcarrier intensity modulation (BPSK-SIM) free-space optical (FSO) communication link in a log-normal atmospheric turbulence model ...
S. S. Muhammad, Z. Ghassemlooy, E. Leitgeb, Tang, Xuan, Muhammad, Sajid Sheikh, S. Rajbhandari, Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, W. O. Popoola, Kandus, Gorazd, Leitgeb, Erich, Rajbhandari, Sujan, X. Tang, G. Kandus   +13 more
core   +1 more source

Ground-to-Drone Optical Pulse Position Modulation Demonstration as a Testbed for Lunar Communications

Drones, 2023
Free-space optical (FSO) communication promises to bring fibre-like speeds to data transmissions between ground, sky and space. This is becoming more important in light of the increasing volume of data collected by aircraft and spacecraft. The University
Skevos F. E. Karpathakis, Benjamin P. Dix-Matthews, Shane M. Walsh, Ayden S. McCann, David R. Gozzard, Alex M. Frost, Charles T. Gravestock, Sascha W. Schediwy   +7 more
doaj   +1 more source

An optically powered, free space optical communications receiver

2008 IEEE International Symposium on Circuits and Systems (ISCAS), 2008
Two of the key components of sensor motes are a power source and a communications receiver. One approach to creating very small motes is to use free space optical communication and to scavenge power from the optical downlink. In this paper photodiodes are described that were made on a standard CMOS process and generate electrical power from the ...
Liu, J, Faulkner, G, Collins, S, O'Brien, D, Elston, S   +4 more
openaire   +3 more sources

Multiple Wavelength Free-Space Laser Communications [PDF]

, 2003
Free-space optical communications systems in the atmosphere, based on intensity modulation and direct detection, are heavily affected by fading caused by turbulence cells of varying scale and motion.
Perlot, Nicolas, Hennes Henniger, Giggenbach, Dirk, Nicolas Perlot, Henniger, Hennes, Florian David, Robert Purvinskis, David, Florian, Dirk Giggenbach, Purvinskis, Robert   +9 more
core   +1 more source