Reliable distributed spectrum sensing strategy in cognitive radio networks

The uncertainty of the radio environment has a significant impact on the accuracy and reliability of spectrum sensing in the cognitive radio networks.To solve the problem,a reliable distributed spectrum sensing strategy is proposed,which is based on a dynamic reputation model.Firstly the collaborative group of spectrum detection is established,and then we design a distributed reputation database for nodes on a basis of subjective logic theory.The channel search sequence is updated through the result of dynamic renewal of the reputation.And also the malicious nodes can be effectively isolated by the strategy.The simulation results show that the algorithm according to the strategy not only can improve the accuracy of spectrum sensing,but also ensure the reliability,and thus increase the channel utilization.