Stamatios Arkoulis

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The current trend for opportunistic use of the licensed or licensed-exempt wireless spectrum with limited rules, or even without rules, introduces significant scientific and technical challenges for the Networks of the Future. Until now, for the realization of the cognitive radio paradigm, several spectrum sharing schemes have been proposed, such as(More)
The increasing availability of small-size sensor devices during the last few years and the large amount of data that they generate has led to the necessity for more efficient methods regarding data management. In this chapter, we review the techniques that are being used for data gathering and information management in sensor networks and the advantages(More)
Recent advances in the fields of Cognitive Radio and the proliferation of open spectrum access promise that spectrum-agile wireless communication will be widespread in the near future, and will bring significant flexibility and potential utility improvements for end users. With spectrum efficiency being a key objective, most relevant research focuses on(More)
Wireless community networks (WCNs) are wide-area wireless networks whose nodes are owned and managed by volunteers. These networks are rarely supported by any infrastructure for measuring network performance indicators. In this paper, we present the design, the implementation and the experimental evaluation of KIXEM, an open agent-based architecture, whose(More)
Cognitive Radio (CR) promises to provide better spectrum utilization and increase the availability of (on demand) broadband access to the Network of the Future. CR relies on devices that can sense their (radio) environment, understand it, and model it, so that they can exploit the spectrum through appropriate transmission parameters (in the space, time, and(More)
In the last few years, we have witnessed a tremendous growth in the number of wireless devices operating in unlicensed spectrum. Wi-Fi equipment has become standard in laptops and handhelds, while Blue-tooth prevails for short-range connectivity. The vision of the Internet of Things, where myriads of heterogeneous devices will interconnect over wireless(More)