Research On Physical Layer Security Technology In Cooperative Communication Network

In recent years,physical layer security(PLS)technology has attracted much attention and is widely regarded as a powerful tool to solve the security of communication systems.In this paper,PLS technology is used to study the security problems in cooperative cognitive radio network(CRN)and cooperative interference alignment(IA)network based on multiple-input multiple-output.Firstly,the related technologies of the PLS are described.The development and principles about PLS are introduced in detail.Then the CRN and IA network are introduced separately.The basic models,related technologies and implementation principles of these two networks are explained.On this basis,the security and reliability of the secondary network in CRN are analyzed,and their relationships with intercept probability(IP)and outage probability(OP)are also studied.Different from the previous works,considering that the eavesdropper can eavesdrop on the source node and relay node in the secondary network separately,this scenario is more in line with the actual CRN.Besides,the analysis process considers both the probability of false alarm and the probability of missing alarm,and studied their impact on IP and OP in the direct transmission scheme and relay selection transmission scheme.The obtained closed-form expressions of OP and IP show that the probability of false alarm affects the OP and the probability of missing alarm both has influence on the OP and IP.In the considered more general CRN communication scenario,the simulation results show that the relay selection transmission scheme can greatly improve the security and reliability by increasing the number of relays compared with the direct transmission scheme.In the multiple-input multiple-output cooperative IA network with eavesdropping attack,the traditional secure methods with artificial noise(AN)transmitted by the transmitter or receiver will increase the energy consumption and implementation complexity of the transceiver.Therefore,a secure communication algorithm based on multiple-input multiple-output cooperative IA network is proposed.Specifically,the amplify-and-forward relay is used to interfere with the eavesdropper with AN.The amplified AN and the interference signal are aligned in the zero space at the receivers.So there is no impact on the legitimate receivers.Based on this method,the network model is established.The algorithm feasibility conditions,the transmission rate and the secret rate of the legitimate user,and the eavesdropping rate of the eavesdropper are derived.The corresponding distributed iterative IA algorithm based on the minimum interference leakage is given.This method effectively reduces the complexity of the system.The simulation results show that compared with the traditional scheme,the proposed algorithm can ensure the transmission rate of legitimate users while suppressing the eavesdropping rate.So it can effectively improve the security performance of the system.