Results 161 to 170 of about 35,798 (210)
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Feedforward-based free-space optical communication
Applied Optics, 2021We propose to use 1-bit feedforward information at the free-space optical (FSO) receiver to improve its error performance. We concentrate upon M -ary pulse amplitude modulation (PAM) signaling and design an error-optimal PAM constellation for providing efficient 1-bit feedforward information to the receiver.
Manav R. Bhatnagar, Jamel Nebhen
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Classical capacity of free-space optical communication
Quantum Information and Computation, 2004The classical-information capacity of lossy bosonic channels is studied, with emphasis on the far-field free space channel.
GIOVANNETTI, VITTORIO +6 more
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Adaptive cooperation for free space optical communications
Telecommunication Systems, 2020In this paper, we propose a new Adaptive Cooperation (AC) protocol for Free Space Optical (FSO) communications. Two versions of the protocol are presented. The first protocol uses the Instantaneous Signal to Noise Ratio (ISNR) to activate the relay only when the corresponding instantaneous throughput is better than that of the direct link.
Nadhir Ben Halima, Hatem Boujemaa
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Optical communication in free space
SPIE Proceedings, 2008The success of free-space optical links operating indoors or in the atmosphere or deep space shows a good perspective of the technology. There is no doubt that free-space technology is ready for wide practical application. Optical links have several advantages in comparison with radio links, namely high transmission rates and high security.
Otakar Wilfert +2 more
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Free-Space Optical Communications
Journal of Lightwave Technology, 2006With recent successes of laboratory, inatmosphere, and space demonstrations of free-space optical communications, there is no doubt that the technology is ready for operational deployment. While these successes have shown that there are no laws of physics against such systems, their estimated system costs are still much too high for serious ...
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Free Space Optical Communications Link Budget Estimation
Lasers, Sources and Related Photonic Devices, 2010This paper describes a new methodology of estimating the free space optical communications link budgets to be expected in conditions of severe turbulence. Comparisons will be given between theory and field measurements.
Larry B, Stotts +5 more
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Optical beam position estimation in free-space optical communication
IEEE Transactions on Aerospace and Electronic Systems, 2016The position of the optical beam on an optical detector array is an important parameter for optimal decoding in free-space optical communication systems; thus, its accurate estimation is essential. In this paper, the performance of three estimators (maximum likelihood, center of gravity, and template matching) for the estimation of center of the beam ...
Muhammad Salman Bashir, Mark R. Bell
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Channel estimation for free-space optical communication
IEEE Conference on Decision and Control and European Control Conference, 2011Optical fade caused by atmospheric turbulence impairs the performance of optical communication through atmosphere. Adaptive techniques of signal detection, power control, and channel coding can be employed to reduce the degrading effect of this phenomenon. For implementation of these techniques, the knowledge of channel state is required.
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Bit‐parallel, free‐space, optical communication
Communications on Pure and Applied Mathematics, 1995AbstractIn this paper, we examine several issues of bit‐parallel free space optical communication such as arbitration operations, fault tolerance, and connector alignment. © 1996 John Wiley & Sons, Inc.
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Free Space Optical Communications (FSO)
2007 IEEE Avionics, Fiber-Optics and Photonics Technology Conference, 2007Free space optical communications (FSO) is now common for point to point communications between fixed locations on land, and is also used for communication between moving platforms on land, on the surface of the sea, in air, and in space. Free space implies that it is not practical to use optical fiber to connect the points that need to communicate or ...
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