Trends and Challenges for the Spectrum Sensing in the Next Generation of Communication Systems

In order to obtained efficient ways to use the spectrum frequency the cognitive radio (CR) uses spectrum sensing techniques to allocate secondary users (SU) dynamically. Exist two classes of spectrum sensing techniques, narrowband and wideband sensing. But, with the increase of demand of spectrum and new technologies like 5G, techniques based on narrowband sensing begin to became inefficient. For achieve high data rates, needed for the next generation of communication systems, the wideband sensing techniques became promising. In this article, we present the most promising techniques of the wideband sensing.