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We consider sensing for cognitive network users, in particular focusing on a scenario where a primary user (PU) and a secondary user (SU) operate on the same frequency band. The SU is interested in identifying transmission opportunities when the PU is silent. We investigate how this sensing performed by the SU can be improved through modeling the PU transmission pattern with increasing accuracy. In...
We investigate the optimization of video transmissions over cellular networks by using the H.264 Scalable Video Coding (SVC) at the application layer and an Adaptive Modulation and Coding (AMC) scheme at the physical layer. We analyze how the cross-layer optimization (XLO) of these two techniques together performs compared to a sequential and independent selection of video packets and Modulation and...
Harvesting-Based Wireless Sensor Devices are increasingly being deployed in today's sensor networks, due to their demonstrated advantages in terms of prolonged lifetime and autonomous operation. However, irreversible degradation mechanisms jeopardize battery lifetime, calling for intelligent management policies, which minimize the impact of these phenomena while guaranteeing a minimum Quality of Service...
Many papers analyze selective repeat automatic repeat request schemes by means of a Markov chain representation for the channel and, by extension, the whole transmission system. This Markov approach precisely characterizes the queueing behavior and the statistics of several delay terms. In the vast majority of the investigations, the round-trip time of the channel, which determines the instant of...
In this paper, we focus on next-generation cellular networks and discuss physical resources sharing among the operators. This implies cooperative usage of the available radio frequencies and also infrastructure sharing. In particular, we analyze the spectrum sharing gain achievable at different time scales and the main factors impacting on it. Then, we move towards a wider idea of resource sharing...
Wireless network access and the exchange of multimedia flows over the Internet are becoming more and more pervasive in the everyday life. However, simple technological advances in terms of improved network capacity cannot satisfy the increasing demand of such services, since a paradigm shift from the current Internet architecture is required. The EU FP7 MEDIEVAL project tackles this issue by addressing...
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