... SUsreport the presence of the PU signal. When K = 1 and K = N , the K-out-of-N rule becomes the OR-rule and the AND- rule, respectively.When the OR-rule or the AND- rule is used, the threshold of detector ... respectively. u denotes the decision of the SBS. The most common fusion rules are OR-rule, AND- rule, and majority rule. Under the OR-rule,u = 1 if there exists ui= 1. The AND- rule refers to the SBS determines ... combination, the SUs feed back their own binary decision resultsto the SBS. Let uidenotes the local decision of SUi, where ui= 1 and 0 indicate the presence(H1) and the absence (H0) of the...