Cooperative detection algorithm for cognitive radio based on relay transmission

Aiming at the degrading performance of cooperative detection for cognitive radio brought by the inaccurate detection of the cognitive users with low Signal-to-Noise Ratio (SNR), a cooperative detection algorithm with "OR Rule" that the users with low SNR combine the detection information from the relays was proposed. In the proposed algorithm, the user with high SNR transmitted its detection information to all the users whose SNR was lower than it, and every user combined all the received detection information including the local detection information to attain the local decision, which can obtain the greater detection probability through choosing the optimal weighing genes. Then the coordinator combined all the users' decisions to obtain the final decision about primary user. Simulation showed that the detection probability of the proposed algorithm outperformed that of the tradition algorithm, and when the average SNR increased, the detection probability of the proposed algorithm could increase greatly.