The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Various measurement campaigns have been carried out at different locations by several institutes to study the weather effects, mainly fog, on Free-space optical (FSO) links. Link distance between the FSO transceiver is different for most of the measurement campaigns depending upon the installation and the weather conditions. Specific attenuation with the unit of dB/km is widely used for the detailed...
The aim of this paper is to provide additional information about the performance of the SC EXCELL model, specifically when applied to the prediction of rain attenuation in equatorial and tropical regions. The model generates a long-term rain attenuation Cumulative Distribution Functions (CDF) that separately accounts for stratiform and convective precipitation. The model assessment in estimating attenuation...
Free space optics (FSO) is getting increased popularity during last few years due to its increased power efficiency for reasonably longer distances. Moreover, it provides data rates that can cater for our future broadband telecommunication requirements besides resolving the last mile access bottleneck. But FSO links are subjected to various kinds of signal deteriorations and attenuations due to different...
Line of sight optical wireless or free space optics (FSO) plays an increasingly important role in our communication infrastructure as they offer gigabit per second data rates and low system complexity. The biggest disadvantage of terrestrial FSO links is that low clouds, dry snow and especially dense fog conditions entail heavy losses to the optical beam transmitted in the terrestrial free-space....
This paper gives a summary of some propagation- and radar-measurements carried out (or to be carried out in the next future) in the Spino d'Adda station (near Milano) with particular emphasis on the ones utilizable to support some of the future advanced techniques known as propagation impairment mitigation techniques (PIMT) that will see the light in the next decade. In the past some measurements...
The performance behavior of optical wireless links installed at Graz and Nice is discussed and analyzed for moderate continental fog and dense maritime fog conditions. The knowledge of the free space optical (FSO) wireless links behaviour and the corresponding measured attenuations analysis for the two most prevalent fog types is mandatory as fog severely affects the availability and reliability of...
Fog presents the biggest challenge to propagation of optical signal in free space causing severe attenuations reaching up to several hundred of dB/km. In this paper, an overall fog attenuation behavior of the optical wireless links installed at Milan (Italy) and Graz (Austria) under moderate continental fog conditions, and Nice (France) under dense maritime fog environments is compared and evaluated...
Optical wireless links provide complementary behavior to the existing communication technologies like mmW or RF. It is admitted that the next generation of wireless communication networks (4G systems) will be based on multiple access technologies that will complement each other. Optical wireless is a very adequate access technology for future communication requirements and provides a huge bandwidth...
Interest in free space optics (FSO) has gained enormous popularity over the last few years, mainly due to two reasons, firstly delivering data rates that can meet future broadband telecommunication requirements and secondly as an alternate technology to solve the last mile access gap. However, optical signal transmitted in free space is subjected to deterioration while propagating due to its interactions...
Free space optics (FSO) links in the troposphere are highly dependent on different atmospheric effects, which vary according to different climatic conditions. For terrestrial FSO links, fog is the most critical of all atmospheric effects causing optical signal attenuations up to 480 dB/km in dense maritime fog environments and 130 dB/km in moderate continental fog environments. In this paper a brief...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.