关键词: 无线充能网络, 传感器网络, 物理层安全, 安全能量效率

Abstract: This paper investigates the secure communication in the Radio Frequency（RF） powered Wireless Sensor Networks（WSNs）. Employing the Physical Layer Security（PLS） technique, the secure two-phase communication protocol is proposed. By jointly designing the transmit power, RF signal covariance, information signal beamforming and assisting jamming covariance, the Secure Energy Efficiency（SEE） is maximized in the paper. The SEE maximization is fractional and non-convex, hence an iterative algorithm is proposed by combining the Dinkelbach method and the Sequential Parametric Convex Approximation（SPCA） method. The simulation results show that the proposed transmit scheme can significantly increase the SEE under the security constraint, compared with the baseline schemes.

Key words: wireless powered communication networks, wireless sensor networks, physical layer security, Secure Energy Efficiency（SEE）