Likelihood-ratio-based cooperative spectrum sensing for autocorrelation-assisted detection of OFDM signals in cognitive radio

In this correspondence a likelihood ratio test for performing cooperative autocorrelation-based spectrum sensing of orthogonal frequency-division multiplexing (OFDM)-based primary networks is proposed. The OFDM signal sensing strategy is based on the method introduced in the recent paper [1]. In order to be able to test hypotheses at the fusion center, the distribution of the proposed test statistic is derived. Simulation results show a significant improvement in detection performance compared to the conventional methods.