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In designing cognitive radio systems, one of the most critical issues is handling the channel handover process (CHP). The CHP consists of spectrum sensing, spectrum decision, negotiation on the common control channel, and adjustment of frequency and modulation settings, and such, it can be a time‐consuming process. Consequently, initiating the CHP after each detected user activity (UA) can decrease...
Spectrum efficiency and energy efficiency are the two formal rivals in telecommunication networks. Decreasing cell size in a cellular network is the only way to improve both and femtocell is the most recent technology to this end. Plug-and-play and non-coordinated distribution of femtocells yield some technical challenges. Providing fairness between femtocell base stations (FBSs) is one of the most...
Cognitive radio (CR) is the most promising solution to spectrum scarcity and spectrum underutilization problems. Most of the research in CR design ignores the cost of channel handover process (CHP) in cognition cycle. However, CHP can be a time consuming process that consists of spectrum sensing, spectrum decision, negotiation through control channel, and adjustment of frequency and modulation settings...
Cognitive Radios (CRs) are the most promising solution to underutilization of spectrum and spectrum scarcity problems. However, designing suitable and reliable CRs have many crucial challenges. CRs are required to utilize the spectrum holes, share the spectrum resources with other users and bound harm on primary (licensed) transmission. To overcome these problems an accurate mathematical model for...
Spectrum scarcity and underutilized frequency bands are the most challenging wireless networking problems in the last decade. Cognitive radio (CR) is the promising solution for these two problems. We propose a protection and fairness oriented cognitive radio MAC protocol (PROFCR) for ad hoc networks. PROFCR allows secondary users (SU) to utilize the unused and underutilized frequency bands while bounding...
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