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To solve the transmission problemof physical layer security(PLS) in relay cognitive radio network (CRN), this paper investigates the PLS transmission scheme of multiple relays CRN, which contains two pairs of secondary nodes without direct link each other. Compared with the model that consists ofa pair of secondary node users and a single relay in terms of theoretical analysis and optimization, the proposed scheme is more complicated. To maximizethe joint secret rate of the secondary users,power allocation of the twosecondarysource transmission node withbeamforming andartificial noise assist (PBNAS) is obtained. Furthermore, exploiting the semidefinite programming theory (SDR) and the successive convex approximation (SCA) method, the original complex nonconvex problem is transformed into a convex optimization problem, and the iterative procedure is summarized.Finally, the security transmission rate versus different number relays andrelays total power is simulated. The simulation results show that the security performance of the PBNAS scheme is the best. Introduction Cognitive radio technology aims at improving spectrum efficiency and alleviating spectrum resource scarcity. This technology allows non-authorized users (secondary users) to share legal frequency band with authorized users (primary users) as long as the former doesn’t affect the later, thus it improving spectrum efficiency substantially. Nevertheless, the openness of the CRN structure makes it more likely to suffer the threat of security comparing to the traditional wireless network.[1,2] Under such circumstances, more attentions are paid to PLS technology for the sake of dealing with the security problems in the CRN. [3,4,5] Relay CRN faces more security threats than ever. Bibliographies [4,5] summarized the process of researches in this field. Nowadays, the researches of CRNPLS transmission scheme mainly focus on relay selection [10,11,12,13,14] and relay beamforming [15,16]. There is also some research work reported in Chinese journals [6,7,8,9]. Given that relay beamforming is an important method of PLS, this paper mainly researches the CRNPLS transmission problems based on relay beamforming. There is a pair of nodes and some relay nodes in the bibliographies [10,11,12,13,14], but they just select the best one of the relays to transmit signal. Although bibliographies [15,16] mainly concern about CRNPLS transmission schemes with multi-relay collaboration, they concern only the condition of a pair of secondary users. The optimal aims of them are to receive the required signal to noise ratio (SNR), while sacrifice the secure transmission performance of the system. In the CRN, because of the openness of the wireless network, the data is likely to 254 Advances in Computer Science Research (ACRS), volume 54 International Conference on Computer Networks and Communication Technology (CNCT2016)

Joint Beamforming and the Artificial Noise Security Scheme Based on Successive Convex Approximation in Multi-relay Cognitive Network