Energy-saving cooperative spectrum sensing based on dynamic threshold and credibility

The cooperative spectrum sensing (CSS) needs to transmit more information compared to the single-user spectrum sensing. So registers are adopted in the scheme to reduce the redundant information .Due to the nonuniform feature of geography distribution of cognitive radio (CR) users in the cognitive network, the environment of each CR user is different, which results in different levels of detection credibility of each user. A method based on the combination of dynamic threshold, dynamic credibility and the utilization of false information will be adopted to improve the whole detection probability of CSS. The algorithm is easy to understand and costs less. Under the condition of signal-to-noise ratio (SNR) unevenly distributed, the simulation results by MATLAB show that proposed scheme can obtain higher detection performance and less communication overhead compared to the traditional method and approaches in other papers.