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The concept of cognitive radio (CR) is proposed to deal with the problem that the spectrum resource is almost used up but some licensed bands are under very low utilization at the same time. In CR networks, secondary users (SUs) are allowed to utilize the licensed spectrum bands by paying to the primary users (PUs) with the spectrum licenses. Besides, with the rapid development of wireless communications...
In the recent past several approaches about energy efficient user equipments (UE) using intelligent analog and digital frontends (AFE/DFE) have been discussed. Those, which will be referred to in this paper, face the fact, that although efficient energy budget management is an important issue in mobile communication systems, typically quite an amount of energy is wasted in todays UEs. The reason for...
We propose a novel distributed cross-layer optimization approach for cognitive radio wireless networks. A cognitive radio is a wireless device that is capable of sensing the prevailing environmental conditions and automatically adapting its operating parameters in order to enhance the performance of both the system and potentially the whole network. Given the lack of a centralized intelligence to...
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