Study and Optimization of Cooperative Spectrum Sensing in OFDM Cognitive Radio Networks
In this paper, a cooperative sensing algorithm for OFDM is proposed in this paper based on the performance analysis of ONPD algorithm, then the system weight vector is optimized and the closed form expression of optimal weight vector is obtained using the maximum improved deflection coefficient. Theoretical analysis and simulation results demonstrate the remarkable improvement of proposed algorithm on detection performance compared with the classical cooperation detection algorithm. Orthogonal Frequency Division Multiplexing (OFDM) has become the core modulation technique solution for next generation wireless communication. It has been used by Primary Users (PU) due to the character of multi-carrier and high spectrum efficiency. Recently the study of detection of OFDM signal in Cognitive Radio (CR) system has drawn considerable attention.