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Spectrum sensing Anomaly detection, spectrum decision, spectrum sharing and spectrum mobility are four major functions of cognitive radio systems. Spectrum sensing is utilized to observe the spectrum occupancy status and recognize the channel availability, while CR users dynamically access the available channels through the regulation processes of spectrum decision, spectrum sharing, and spectrum mobility. To ease the preparing defers associated with these four capacities and to improve the productivity of range use, range expectation for intellectual radio systems has been widely contemplated in the writing. This article introducing of ANN strategy to enhancement of range forecast in intellectual radio systems. We abridge the significant range forecast systems, delineate their applications, and present the important open research difficulties.