Physical layer security for cognitive radio networks
In this chapter, we have presented physical layer (PHY)-security of cognitive radio network (CRN). Specifically, we have described fundamental PHY-security in CRN and pointed out some recent enhanced protocols available in the literature. Typical applications of artificial noise for the primary system, secondary system, and cooperative CRN have been investigated. We have also presented a powerful technique such as beamforming design on resource allocation problems for such schemes. For the primary system, based on the derived capacity formula, the impact of the secondary system on the secrecy capacity is analysed. In particular, we point out that when the eavesdropper is very far from the primary system, the use of artificial noise is not effective to protect the primary system from eavesdropping. For the secondary system, the proposed approach offers a better performance and is quite robust when compared to the existing approaches. In addition, a cooperative CRN is also presented to improve PHY-security of the primary system. Simulation results are shown to verify the theoretical developments.
Physical layer security for cognitive radio networks, Page 1 of 2
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