A Review of Miscellaneous Spectrum Sensing Algorithms in 5G Ultra-dense Networks
Keywords:5G, densification, cognitive radio, miscellaneous spectrum sensing, network coexistence, spectrum sharing, ultra-dense networks
The continual development of advanced networks within the Fifth Generation (5G) of wireless systems, and beyond, has seen the rise of multiple important research directions. These include cognitive radio (CR) and ultra-dense networks (UDNs), which are the focus of this article. The CR systems rely on an accurate assessment of the radio environment, which is provided by the spectrum sensing functionality. A review of such algorithms that are characterized by the detection of miscellaneous features of the received signal, together with their performance comparison, is presented. In addition, the application of a simple and adequate solution is assessed through its probability of detection, for a relevant UDN system model under the critical density limitation for the access point (AP) deployment
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