Results 41 to 50 of about 42,600 (309)
Adaptive symbol-rate free-space-optical communications [PDF]
2013 Australian Communications Theory Workshop (AusCTW), 2013 Free space optical communications through fading atmospheric channels can achieve improved throughput by using adaptive transmission techniques. This paper considers the use of adaptive symbol-rate and transmit-power methods. We use an idealised model of channel coding that assumes zero errors can be achieved above some SNR threshold and adjust the ...
William G. Cowley +2 more
openaire +1 more source
Enhanced Neural Architecture for Real-Time Deep Learning Wavefront Sensing
SensorsTo 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 +4 more
doaj +1 more source
, 2007 The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or deep signal-fades caused by index of refraction turbulence
Bernhard Epple, Epple, Bernhard
core +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 +4 more
openaire +2 more sources
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 +7 more
doaj +1 more source
, 2006 A high bitrate optical downlink was performed by the stratospheric optical payload experiment (STROPEX), a part of the EU CAPANINA project. The STROPEX objectives were to design and build the necessary hardware to demonstrate an optical backhaul downlink
Knapek, Markus +9 more
core +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 +13 more
core +1 more source
Quantum Relay-Assisted Free-Space Optical Communication
IEEE Photonics JournalRelay-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 +2 more
doaj +1 more source
Hybrid SPAD/PD Receiver for Reliable Free-Space Optical Communication
IEEE Open Journal of the Communications Society, 2020 Free-space optical (FSO) communication provides wireless optical connectivity with high data rates and low-cost implementation; however, its performance is strongly influenced by the power attenuation due to the infrequent adverse weather conditions ...
Shenjie Huang, Majid Safari
doaj +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 +9 more
core +1 more source