Cooperative frequency spectrum perception method

The invention provides a cooperative frequency spectrum perception method applied in a cognitive radio system. The method comprises the following steps: configuring the cognitive radio system comprising N secondary users and at least one information fusion center in a network of an existing primary user; based on an energy detection method, acquiring a detection error probability of a single link, wherein the detection error probability of the single link is related with a detection probability, a false alarm probability and a false dismissal probability; when the detection error probability of the single link is a minimum, based on that, acquiring a relation of a threshold value and a signal to noise ratio, therefore, determining an optimal threshold value under the different signal to noise ratios; based on the detection probability of the single link, the false alarm probability and the false dismissal probability, acquiring the detection probability, the false alarm probability, the false dismissal probab