GLRT based cooperative spectrum sensing with location information

In this paper, we address the problem of cooperatively detecting a primary user with unknown transmit power among multiple cognitive radio (CR) users with their location information available at the CR base station. A generalized likelihood ratio test (GLRT) is developed at the CR base station to first estimate the transmit power of the primary user and then detect the primary user signal. The maximum likelihood (ML) estimate of the unknown transmit power is discussed in details in order to provide guidelines for the design of the cooperative detector. Performance verification of the ML estimate of the unknown transmit power is provided. Meanwhile, asymptotic performance analysis for the proposed GLRT is also presented. Simulation results show that the proposed detector exhibits better performance than conventional techniques in terms of detection probability with limited observations.