Stamatios Arkoulis

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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)
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)
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)
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 Bluetooth prevails for short-range connectivity. The vision of the Internet of Things, where myriads of heterogeneous devices will interconnect over wireless(More)
The vacant or under-utilized TV bands are resourcefully operated by Cognitive Radio permitted IEEE 802. 22 Wireless Regional Area Networks (WRAN). Conversely due to the nature of cognitive radio networks and absence of active security protocols, the IEEE 802. 22 networks are exposed to several Denial of Service (DoS) threats. In this work the target band(More)