An Interference Cancellation Scheme for Cognitive Radio Network

This paper investigates the interference cancellation for a cognitive radio based CDMA system, and the object is to reduce the interference both to the primary and the cognitive users. We propose a beamforming scheme in which the cognitive users operate in the licensed band without causing any interference to the primary user, while employing the interference cancellation technology at the receive side of the cognitive users to eliminate the passive effect from the primary user to the greatest extent. Simulation results show that the proposed scheme has a significant effect on removing the interference in a cognitive radio based CDMA system.