Spectrum Handoff in Cognitive Radio Networks: A Survey

Analytical modeling for spectrum handoff decision in cognitive radio networks

Article history: Received 20 May 2013 Received in revised form 27 July 2013 Accepted 30 July 2013 Available online 26 August 2013

Challenges of Spectrum Handoff in Cognitive Radio Networks

Cognitive Radio (CR) with Dynamic Spectrum Access (DSA) could alleviate the shortage of radio resources. Secondary Users (SUs) (unlicensed users) could access the spectrum when Primary Users (PUs) (licensed users) are inactive. The service interruption loss arises as secondary users try to handoff the channel to the legitimate users of the channels, the primary user. This new type of loss is di...

Spectrum Leasing in Cognitive Radio Networks: A Survey

Spectrum scarcity and underutilization in wireless networks, arising due to traditional static spectrum allocation, have been of great concern since the past decade. The suboptimal use of spectrum motivates new wireless concepts where unlicensed users opportunistically access licensed spectrum using cognitive radio technology. A cognitive radio can change its operating parameter intelligently i...

A Survey on Spectrum Management in Cognitive Radio Networks

A Survey on Cooperative Spectrum Sensing in Cognitive Radio Networks

In cognitive radio networks, spectrum sensing is a crucial component in the discovery of spectrum opportunities for secondary systems (or unlicensed systems). The performance of spectrum sensing is characterized by both accuracy and efficiency. Currently, significant research effort has been made on improving the sensing accuracy. Several exemplary techniques include energy detectors, feature d...