Research On The Technology Of Physical-Layer Security In Full-Duplex Networks

Due to the broadcast characteristics of wireless communication,the information transmitted through wireless media may be intercepted and eavesdropped by illegal users.Traditional information security methods are generally based on network layer technology which rely on strong computer processing capacity.With the progress of computer technology,the possibility of being cracked greatly improved.The physical layer security technology ensures the security of the communication information through the physical characteristics of the wireless channel,so that the transmission data in the wireless communication system is processed at the bottom layer,which can enhance the data confidentiality in the transmission process.With the rapid development of full-duplex radio communication technology,the latest research results shows the full-duplex signal transmit in the same time slot and frequency,the self-interference can be suppressed to the white noise level.Research physical layer security technology under the full-duplex relay scene,both can play the characteristics of collaborative relay,but also through full-duplex technology to make the system transmission rate and security performance almost doubled,so the study of physical layer security technology in full-duplex collaboration scene is of great significance.In this paper,through the design of artificial noise and beamforming vector,the secure transmission method under full duplex relay scene is realized.The main research work is as follows:1.In this paper,relay transmission scheme with integrated artificial noise is designed under the multi-node cooperative full-duplex relay model,and an optimization algorithm based on safety rate maximization and power minimization criterion is proposed.Through the KKT condition derivation,as well as the strong duality between the safety rate maximization problem and the power minimization problem,which proves the optimality of the algorithm.The simulation results show that the proposed secure transmission scheme has a significant improvement in system performance compared with the original beamforming technology.2.In this paper,robust transmission scheme in full-duplex relay scenario is designed because of the uncertainty of channel state information.In the bounded error model and the statistical error model,the SINR constraint of the eavesdropping method is transformed into a linear inequality constraint by S-procedure and so on.The optimization problem of maximizing the legal client SINR is transformed into a convex optimization problem,and the system is maximized The beamforming vector of the secret capacity and the artificial noise matrix,so that the communication security in the non-perfect channel scene is guaranteed.3.This paper proposes a secure transmission scheme with the cooperation of the source and the relay.When the relay transmission power is high,it is difficult to make the security capacity of the system increase continuously because of the influence of the factors such as self-interference noise.Based on the design of relay forwarding scheme,this paper proposes an algorithm of source and relay combined power allocation,which improves the security performance of the system.