Decision Making Approaches in Cognitive Radio-Status, Challenges and Future Trends

In the past few years, we have seen a lot of research in the field of cognitive radio technology, because this technology represents a promising behavior for the problem of scarcity of spectrum, and the increase in the demand for spectrum frequencies by individuals, companies, and the so-called Internet of things. The cognitive radio cycle consists of several steps, and one of the most important steps is the step of analysis and decision-making. There are many algorithms and approaches to investigate at this step. This article will survey the most important current trends in this field, as well as the problems and challenges that are still open in this field, and it will review future trends algorithms, and techniques for analysis and decision-making.