Research on Cooperative Spectrum Sensing based on Trust Scheme in Cognitive Radio Networks

In cognitive wireless network, some selfish or malicious users will report incorrect spectrum sensing results during the spectrum sensing process, which will cause the fusion center to make wrong judgments. To solve this problem, we introduced a dynamic trust mechanism to reduce the influence of malicious users. A trust model based on Beta distribution is established to calculate the user trust level through the observational statistics in the perception phase. The Fusion Center assigns different weighting coefficients according to the trust of each user, and conducts a comprehensive evaluation of the historical trust status of cooperative users, thereby reducing the impact of sudden errors and improving the accuracy of cooperative spectrum sensing.