Full-Duplex Wireless Communication in Cognitive Radio Networks: A Survey

Since past few years, as the technology growing in the field of wireless communication with their ubiquitous application, the demand for spectrum resources is also increased. To exploit the demand for spectrum, Cognitive Radio Networks (CRNs) became the most promising solution. Many works have been done in half-duplex CRNs, where at a given time secondary user can only sense the spectrum or transmit the data. Half-duplex CRN is unable to transmit the data during sensing period. This is the major limitation of half-duplex CRN. On the other hand, full-duplex CRNs can simultaneously sense and transmit the data at a given time, which improves the throughput of system as compared to half-duplex CRNs. This property of full-duplex communication motivates for more research in field of energy efficiency, energy harvesting, and throughput maximization in CRNs. In this paper, we have presented the energy efficiency, energy harvesting, and throughput calculations with open issues and challenges of full-duplex communication in cognitive radio networks.