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A Cognitive Beamforming Scheme for Coexistence of Cognitive Radio and Incumbent Radio Systems  

Kim, Jae-Woon (School of Electronic Engineering, Soongsil University)
Kim, Hyun-Wook (School of Electronic Engineering, Soongsil University)
Hong, Min-Ki (School of Electronic Engineering, Soongsil University)
Shin, Yo-An (School of Electronic Engineering, Soongsil University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.3, 2008 , pp. 27-33 More about this Journal
Abstract
In this paper, we propose a cognitive beamforming scheme for coexistence of CR (Cognitive Radio) and IR (Incumbent Radio) systems. In order to maintain the priority of the IR in spectrum utilization the proposed cognitive beamforming scheme needs to have the CR not cause any interference to the IR systems occupying the same frequency band at the same time. In addition the proposed scheme has to provide maximum channel gain to the CRU (CR User) in a boundary of satisfying the former criterion. For this purpose, the proposed scheme does not cause any interference to the IRU (IR User), while the CRU is served without additional radio resource consumption. From simulation, we confirmed that when using the proposed scheme the CRU does not interfere with the IRU and there is little bit error rate performance degradation of the CRU as compared to that of the ideal beamforming system, which does not consider the IR priority.
Keywords
Cognitive Radio; Cognitive Beamforming; Interference Cancellation; Multiple Antenna; OFDM;
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