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The explosive growth of mobile devices and the rapid increase of widebandwireless services call for advanced communication techniques that can achievehigh spectral efficiency and meet the massive connectivity requirement.Cognitive radio (CR) and non-orthogonal multiple access (NOMA) are envisionedto be important solutions for the fifth generation wireless networks.Integrating NOMA techniques into CR networks (CRNs) has the tremendouspotential to improve spectral efficiency and increase the system capacity.However, there are many technical challenges due to the severe interferencecaused by using NOMA. Many efforts have been made to facilitate the applicationof NOMA into CRNs and to investigate the performance of CRNs with NOMA. Thisarticle aims to survey the latest research results along this direction. Ataxonomy is devised to categorize the literature based on operation paradigms,enabling techniques, design objectives and optimization characteristics.Moreover, the key challenges are outlined to provide guidelines for the domainresearchers and designers to realize CRNs with NOMA. Finally, the open issuesare discussed.

State of the Art, Taxonomy, and Open Issues on Cognitive Radio Networks with NOMA