Availability Evaluation of Ground-to-Air Hybrid FSO/RF Links

Wu, Haiping; Kavehrad, M.

doi:10.1007/s10776-006-0042-1

Cited by 38 publications

(15 citation statements)

References 18 publications

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“…The availability of a hybrid system comprising of an FSO main link and 40 GHz back up link was measured to be 99.92% compared to 96.8% availability of FSO alone [6]. Different combinations of FSO and mmW transmission links had been proposed in the past for various application scenarios like hybrid link for airborne applications [7], ad-hoc mobile networks [8] and terrestrial and space applications [9]- [11]. The idea behind using such a hybrid network is to utilize the potential of the backup link when main link is not fully functional.…”

mentioning

confidence: 99%

Weather effects on hybrid FSO/RF communication link

Nadeem

Kviçera

Awan

et al. 2009

IEEE J. Select. Areas Commun.

240

109

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Free Space Optics (FSO) or optical wireless systems provide high data rate solution for bandwidth hungry communication applications. Carrier class availability is a necessity for wide scale acceptability which is extremely difficult to achieve in the case of optical wireless links. FSO links are highly weather-dependent and different weather effects reduce the link availability. Employing a hybrid network consisting of an FSO link and a back up link in the GHz frequency range renders high availability besides providing comparable data rates. In this paper effects of fog, rain and snow on FSO/GHz hybrid network are studied so that GHz frequencies with best complementary behaviour can be selected as a back up link. As a prime conclusion of the article, it is suggested that free space optical links can be supplemented with 40 GHz RF links to achieve near carrier class availability.

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mentioning

confidence: 99%

Weather effects on hybrid FSO/RF communication link

Nadeem

Kviçera

Awan

et al. 2009

IEEE J. Select. Areas Commun.

240

109

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“…The attenuation in Eq. 3 is the function of visibility only, which determines the defined particle size [11]. The values to be used in the above equation are given in Table 1.…”

Section: System Analysismentioning

confidence: 99%

Relay-assisted WDM-FSO System: A Better Solution for Communication under Rain and Haze Weather Conditions

Dayal¹,

Singh²,

Kaur³

2017

JTIT

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Abstract-Among various conventional wireless communication systems, Free Space Optics (FSO) may be distinguished as well, which provides a good level security, high data rates, an enormous bandwidth and negligible susceptibility to electromagnetic interference. The main problem arises with unfavorable weather conditions, which affect the system's parameters and require an aversion to other paths. The weather conditions discussed are rain and haze. Elimination of their adverse effects is essential for establishing a better communication system. The routing path is a major issue, as its decreased parameters lead to the diversion of the transmitted signal or to its total loss. In this article, increased system path length and proficiency levels are demonstrated by using relays, which are assisted by Wavelength Division Multiplexing (WDM).

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“…However, the scattering on hydrometeors also imposes multiple propagation paths, which causes temporal broadening (dispersion) of transmitted symbols resulting in intersymbol interference (ISI) for high bandwidth links. The significant effect of dispersion has been studied, for example, for ground-to-air/satellite communication through clouds [10]. For typical municipal optical links, which are the subject of this paper, the effect is negligible.…”

Section: Hybrid Channel Characterizationmentioning

confidence: 99%

Hybrid FSO/RF test link

Kolka

Kincl

Biolková

et al. 2012

2012 IV International Congress on Ultra Modern Telecommunications and Control Systems

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The paper deals with the design of a test link for the characterization of a hybrid Free Space Optical/RadioFrequency (FSO/RF) atmospheric channel. The ever-increasing demand on broadband connectivity, specifically in the Last-Mile networks, leads to the use of Free-Space optical systems in combination with RF systems above 100 GHz, which are able to reach data rates in the order of 10 Gb/s. However, both systems are strongly influenced by weather conditions. A significant increase in the link availability can be achieved by combining both technologies. An optimum design of such systems requires reliable models of atmospheric channels. The test link presented in this paper is intended for long-term monitoring of atmospheric attenuation and turbulence in the optical band at 850 nm and 1550 nm, and in the millimeter band at 122 GHz. The bandwidth of both measuring systems has been chosen narrow but sufficient for capturing all important phenomena. This results in the dynamical range of nearly 50 dB, which is not available from the RSSI signal of commercial broadband systems.

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Availability Evaluation of Ground-to-Air Hybrid FSO/RF Links

Cited by 38 publications

References 18 publications

Weather effects on hybrid FSO/RF communication link

Weather effects on hybrid FSO/RF communication link

Relay-assisted WDM-FSO System: A Better Solution for Communication under Rain and Haze Weather Conditions

Hybrid FSO/RF test link

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