Cognitive radio cooperative spectrum sensing method based on OFDM

The invention provides a cognitive radio cooperative spectrum sensing method based on OFDM. According to the method, a multi-user diversity sensing strategy is adopted, a multi-user cooperative sensing model based on OFDM is established, and a soft combining mode is used to obtain a final sensing result, wherein characteristic sensing aiming at OFDM signals is adopted by single point sensing, and a sensing result combining algorithm considers the condition that a report channel has noises; a maximized offset coefficient method is employed to carry out modeling optimization on weight, and an optimal weight vector is obtained; and a linear combining algorithm is employed to process collected data, and whether the OFDM signals exist is determined finally. According to the invention, the cognitive radio cooperative spectrum sensing method aiming at the OFDM signals is established, the OFDM signal characteristic correlation detection method is introduced into the multi-user cooperative detection, the performance of single point detection and cooperative sensing is analyzed, and system performance parameters are obtained. In addition, the maximized offset coefficient method is utilized for modeling, the weighting coefficient is optimized, and the closed expression of the optimal weight is obtained.