For a full-duplex time-switching simultaneous wireless information and power transfer(SWIPT)relay system,a scheme for collaborative jamming by the receiver is proposed to improve the performance of physical layer security in the case that the relay is a potential eavesdropper.Besides,an algorithm for joint optimization of the time switching and energy allocation of the source and desti-nation node in the energy transmission and information transmission stages is also given.Firstly,the re-lay node is a full-duplex SWIPT node,which harvests energy from the signals received in the energy transmission stage for signal forwarding in the information transmission stage.Secondly,to prevent the untrusted relay from obtaining confidential information,the full-duplex destination node sends jam-ming signals while receiving signals.Finally,to maximize the achievable secrecy rate,the time switch-ing factor and the energy allocation factors for both transmission stages at the source node and the des-tination node are jointly optimized.Simulation results show that the achievable secrecy rate of the opti-mized system is significantly higher than that of the system that optimizes only two or one of the factors,or no optimization.
simultaneous wireless information and energy transfertime switchingcollaborative jam-mingenergy allocation
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