It is now widely recognized that wireless communications systems don't exploit the whole
available frequency band. The idea has naturally emerged to develop tools to better use the …

In the first chapter of this report, we provide an overview on mobile and wireless networks,
with special focus on the IEEE 802.22 norm, which is a norm dedicated to cognitive radio …

To improve the utilization of spectrum resource, a primary network can share its unused
bandwidth with a closely located secondary network. As a compensation, the latter should …

Introducing orthogonal frequency division multiplexing (OFDM) into cognitive radio (CR) can
potentially increase the spectrum efficiency, but it also leads to further challenges for the …

This paper presents a transmission power control model for wireless networks. The objective
is to guarantee energy efficiency in packet delivery and reduce mutual interference, finally …

Cognitive Radio Networks appear as a probable solution for spectrum scarcity. However,
establishing a balance between transmit power and interference in cognitive radio network …

The unprecedented proliferation of wireless infrastructures and their ongoing convergence
with diverse industrial Internet of Things (IoT) applications introduce new demands for …

Power allocation is an important issue for Cognitive Radio Networks (CRNs), since it needs
to consider the Quality of Service (QoS) for Secondary Users (SUs) while maintaining the …

Large-scale multi-AP WLANs with a high density of users and access points (APs) have
emerged widely in various hotspots, where intra-cell interference is detrimental to the …

Most orthogonal frequency division multiplexing (OFDM) cooperative schemes in wireless
communication system are poor in secure transmission. Based on the Nash bargaining …