In the last years indoor localization and applications that use positioning information have attracted a lot of attention from the...

Visible Light Communication(VLC) has emerged in the last years as a new way to communicate. Using the existing lighting infrastructure,...

By leveraging on novel concepts of virtualization and programmability, future 5G Net- works are expected to be reliable, high-performing and...

As the Internet is becoming a fundamental aspect of the society serving as a de facto platform for social and...

While the IEEE 802.11 protocol has fostered ubiquitous connectivity for wireless users, it was not originally designed to efficiently handle voice or video traffic, which nowadays accounts for most of the Internet traffic.

In this thesis, signal propagation variations that are experience over the frequency resources of IEEE 802.11 Wireless Local Area Networks (WLANs) are studied.

The rapid growth of wireless mobile devices has led to saturation and congestion of wireless channels – a well-known fact. In the recent years, this issue is further exacerbated by the ever- increasing demand for traffic intensed multimedia content applications, which include but are not limited to social media, news and video streaming applications.

This thesis tackles the optimization of energy efficiency in data centers in terms of network and server utilization.

Cellular service providers have been struggling with users’ demand since the emergence of mobile Internet. As a result, each generation of cellular network prevailed over its predecessors mainly in terms of connection speed.

Mobile cellular networks are complex system whose behavior is characterized by the superposition of several random phenomena, most of which, related to human activities, such as mobility, communications and network usage. However, when observed in their totality, the many individual components merge into more deterministic patterns and trends start to be identifiable and predictable.