With the rapid proliferation of new technologies and services in the wireless domain,
spectrum scarcity has become a major concern. The allocation of the Industrial, Medical and …

Currently, the radio spectrum is statically allocated and divided between licensed and
unlicensed frequencies. Due to this inflexible policy, some frequency bands are growing in …

Although more than a decade has passed from the proposal of the Cognitive Radio
paradigm, in these years the research has mainly focused on physical and medium access …

Cognitive Radio (CR) and its dynamic spectrum access capabilities can be exploited by
many wireless network architectures including sensor networks. Thus, cognitive radio …

Implementing energy-efficient CPUs and peripherals as well as reducing resource
consumption have become emerging trends in computing. A landmark for researchers in …

For a cognitive radio (CR) system, we investigate the estimation problem in which a
secondary user (SU) estimates the channel parameters such as the sojourn times on the …

With the rapid development of wireless communications technologies, radio spectrum has
become a type of extremely scarce resources in meeting the increasing demands for …

Implementation of any cognitive radio network requires an effective control channel that can
operate under various modes of activity from the primary users. This paper reports the …

In this paper, we consider the channel assignment problem for cognitive radio networks with
hardware-constrained secondary users (SUs). In particular, we assume that SUs exploit …

Abstract The uncertain availability of the spectral resource imposes unique challenges in
cognitive radio networks. One of the critical issues is to counteract the performance …