Cognitive radio networks are being studied intensively. The major motivation for this is the heavily underutilized frequency spectrum. The development is being pushed forward by the rapid advances in software defined radio technology which enable a spectrum agile and highly configurable radio transmitter/receiver. We conduct a literature survey on recent major research advances in cognitive rad...

Cognitive Radio (CR) is an important future wireless radio access technology having the potential to solve the spectrum scarcity and under-utilization problems. Using CR however, poses new challenges for network nodes and architectures due to the inherent complexity of cognitive radio technology. In this paper, we propose a unique database-driven “Channel Profiler Framework” for cognitive radio...

Performance evaluation and analysis are of key importance to obtain deep understanding of cognitive radio networks. Some effects have been made to model and analyze the performance of cognitive radio networks. In the literature, there are two methodologies: queuing theory/Markov chain-based analysis and stochastic network calculus-based analysis. These two methodologies rely on different mathem...

In this paper the detection performance of relay based cognitive radio networks is studied. Relays are assigned in cognitive radio networks to transmit the primary user’s signal to cognitive coordinator or CPU thus achieving cooperative spectrum sensing. The soft fusion rule is used at the relays which acts as amplify and forward relays. For the detection purpose the energy detector is employed...

Energy efficiency in cognitive radio networks has received lots of research attention lately due to the impact low energy efficiency has on the design, implementation and performance of the network. In this research, cognitive radio network as regards to energy efficiency has been analyzed. The importance of energy efficiency in cognitive radio networks and sources of unnecessary energy consump...