Free Space Optical Communication

Kaushal, Hemani; Jain, V. K.; Kar, Subrat

doi:10.1007/978-81-322-3691-7

Cited by 274 publications

(209 citation statements)

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“…Assuming a point detector implies that the dark current can be neglected in the noise considerations. Indeed, and as indicated in [10], the dark current is reduced by cooling the detector or by reducing the physical size of the detector. Thus, if we consider a point detector, then dark current can be definitively neglected.…”

Section: System Modelmentioning

confidence: 98%

Fade statistics of ℳ ${\mathcal {M}}$ -turbulent optical links

Jurado-Navas

Garrido-Balsells

Castillo-Vázquez

et al. 2017

J Wireless Com Network

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A new and generalized statistical model, called Málaga or simply M distribution, has been derived recently to characterize the irradiance fluctuations of an unbounded optical wavefront propagating through a turbulent medium under all irradiance fluctuation conditions. The aforementioned model extends and unifies in a simple analytical closed-form expression most of the proposed statistical models for free-space optical (FSO) communications widely employed until now in the scientific literature. Based on that M model, we have studied some important features associated to its fade statistics and expressed in terms of the expected number of fades per second. The derived expressions become relevant for many aspects in a FSO system, especially those ones related to determine the optimum threshold in a receiver based on a direct detection scheme employing a fixed detection threshold.

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Section: System Modelmentioning

confidence: 98%

Fade statistics of ℳ ${\mathcal {M}}$ -turbulent optical links

Jurado-Navas

Garrido-Balsells

Castillo-Vázquez

et al. 2017

J Wireless Com Network

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“…An atmospheric loss in FSOC is mainly affected by beam divergence and weather conditions [3]. To describe the attenuation due to the fog, rain, and snow, the three coefficients are expressed as follows,β rain = 1.076R 0.67 ,β snow = aS b , andβ fog (λ) = 3.91 V λ 550 nm −p , where R, S are rainfall and snowfall rates, V is visibility, p is size distribution coefficient of scattering, λ is wavelength and assumed 780 nm in this paper.…”

Section: System Modelmentioning

confidence: 99%

“…2, each of the four flight paths represents an energy efficient trajectory when the different atmospheric environments are taken into account. We assumed the parameter values in wet snow a = 5.42λ × 10 −5 + 5.50, b = 1.38 [3]. Fig.…”

Section: Energy-efficiency Maximizationmentioning

confidence: 99%

Trajectory Optimization of Energy Efficient FSOC-UAV with Atmospheric and Geometric Loss

Lee

Park

Alouini

et al. 2018

2018 Tenth International Conference on Ubiquitous and Future Networks (ICUFN)

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Abstract-This paper address the issues of optimizing unmanned aerial vehicle (UAV) using free-space optical communication (FSOC). In particular, we examine how the beam divergence and the atmospheric attenuation of FSOC channel affect the flight of energy efficient UAVs. Especially based on geometric loss and also the effect of rain, snow, and fog on FSOC, we showed the energy efficient trajectory of UAV.

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“…The signal intensity and implicitly the bit error rate of free space optical channels can be affected by multiple factors, which result in attenuation of the signal [15,27], which we enumerate in the Appendix.…”

Section: Fso Channel Modelmentioning

confidence: 99%

“…They propose to use these results to plan ahead for channel fading, by adjusting the link design to include an adequate fade margin, for example, by promising lower overall rates to consumers or planning for signal 2 Wireless Communications and Mobile Computing amplification capabilities. An overview of the factors that can affect an FSO link and methods to determine the attenuation of signal strength caused by them can be found in [15]. These factors can have constant effects such as the free space loss which can be derived exactly from the link range, effects that can last for a significant period of time such as losses due to weather conditions, and effects that can last a very small time such as losses caused by scintillation, a form of atmospheric turbulence.…”

Section: Introduction and Related Workmentioning

confidence: 99%

Availability of a Hybrid FSO/RF Link While Using the Link’s Diversity for Packet Scheduling

Grigoriu

2018

Wireless Communications and Mobile Computing

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Hybrid-free space optical and radio frequency wireless links are a way of providing reliable transport of real-time traffic in outdoor wireless environments. We consider a link layer protocol that assigns packets to each physical channel of such a hybrid link, which first attempts to send each packet over one of the links (the main link) and, if unsuccessful, sends the packet over the other link (the backup link). The hybrid link processes high-priority traffic by using the link layer protocol and additional (background) traffic at low priority over the backup link. In this setting, high-priority traffic can be transmitted at a rate as high as the maximum capacity of the main link, assuming that the backup link can compensate for main link capacity deterioration, with no need for reconfigurations aimed at adapting to changes in weather conditions, which is an advantage over other approaches. From the perspective of link availability for high-priority traffic, we compare our approach to using another protocol that does not require reconfigurations, which could be employed if the backup link is expected to have a constant transmission rate during the time interval of interest. For situations where both links can be represented by finite-state Markov models with states corresponding to channel bit error rates, as has been done in previous literature for radio frequency links and for free space optical links affected by strong atmospheric turbulence and Gaussian noise, we give a way to provide probabilistic quality of service guarantees for background traffic assuming that the high-priority traffic is insured to not exceed a given constant rate.

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Free Space Optical Communication

Cited by 274 publications

References 0 publications

Fade statistics of ℳ ${\mathcal {M}}$ -turbulent optical links

Fade statistics of ℳ ${\mathcal {M}}$ -turbulent optical links

Trajectory Optimization of Energy Efficient FSOC-UAV with Atmospheric and Geometric Loss

Availability of a Hybrid FSO/RF Link While Using the Link’s Diversity for Packet Scheduling

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