Cognitive Radio와 Incumbent Radio의 공존을 위한 Cognitive Beamforming 기법

In this paper, we propose a cognitive beamforming scheme for coexistence of CR (Cognitive Radio) and IR (Incumbent Radio). The proposed cognitive beamforming does not cause any interference to the IRU (IR User), while the CRU (Cognitive Radio User) is served without additional radio resource consumption. Simulation results show that when using the proposed scheme the CRU does not interfere with the mu and there is IRU bit error rate performance degradation of the CRU as compared to that of the ideal beamforming system which does not consider the IR priority.