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The growth of self-installed femtocells in residential and office environments triggers harmful femto-to-femto interference levels. In order to overcome this problem, we suggested that operators mutually share their licensed spectrum allowing femtocells to exploit also the frequency resources of other operators. By assuming mutual arrangements among operators, we proposed algorithms enabling femtocells...
In wireless ad hoc networks, effective spatial channel reuse can maximize the achievable throughput. To this aim, power-controlled multiple access MAC protocols seems to be a viable solution to allow a greater number of simultaneous transmissions on the same channel. In this paper, we propose an opportunistic distributed algorithm to increase throughput in ad-hoc networks by exploiting the spatial...
Opportunistic Spectrum Access (OSA) is a promising solution to increase spectral efficiency in the Cognitive Radio (CR) framework. In OSA networks, unlicensed Secondary Users (SUs) need a Common Control Channel (CCC) to identify the spectrum opportunities, i.e., common spectrum holes unused by licensed Primary Users (PUs). To fulfill this requirement, the sharing of the spectrum sensing data via Ultra-wideband...
In recent years, Wireless Sensor Networks (WSNs) have been largely deployed for various applications. Among them, monitoring in unlicensed frequency bands of the environment and historical sites assumes particular relevance. However, these bands are becoming more and more overcrowded due to the fast growth of wireless services relying on them. A possible solution to overcome this problem is offered...
The increasing demand of indoor broadband access encourages the diffusion of the "home base stations", known as femtocells. Their self installation nature envisages interference problems due to a possible overload of local femtocell installations in the same area. To reduce the interference among femtocells we propose and analyze the performance of a dynamic frequency selection strategy,...
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