Analysis Of Relay Selection Scheme And Outage Probability In Wireless Network

In wireless networks with eavesdroppers,as compared to traditional cryptographic methods to protect information from eavesdropping,the physical layer security relies on the inherent properties,such as channel fading and noise,of the physical layer to achieve confidential communication with higher security and reliability.For wireless networks with legitimate relay nodes,the selection schemes of relay and the analysis of outage probability are important theoretical bases of physical layer security.This article considers two types of relay nodes,one is the traditional relay to assist in forwarding messages to improve the reliability of information transmission,and the other is a jammer that causes friendly interference to eavesdroppers,which is used to improve the security of information transmission.Based on the goal of improving the reliability and confidentiality of information transmission,for wireless networks with eavesdroppers,the paper studies the selection of system relay schemes and the probability of interruption.The main work and innovations are as follows:1.In the wireless network with eavesdroppers,based on the direct transmission situation,first of all,two kinds of options related to cooperative relay are summarized,which are Pure Relay(PR)selection and Pure Jammer(PJ).Selection scheme,on the basis of the above scheme,a new Optimal Relay and Jammer(ORJ)selection scheme is proposed;secondly,the interception probability is introduced to analyze the security of wireless communication,and the interception probability under the above three schemes is analyzed separately;finally,verification through simulation Compared with the PR and PJ schemes,the ORJ scheme has a lower probability of interception,and its network security performance is optimal.2.The paper further studies the impact of jammers on physical layer security,and first proposed a Single Jammer(SJ)selection scheme.On the basis of the SJ scheme,the number of jammers is expanded,and many more are proposed.The Multiple Jammer(MJ)selection scheme,on the basis of the MJ scheme,increases the type of cooperative relay,and proposes a multi-jammer single relay(MJSR)selection scheme;based on the above scheme,further use of the probability density function(PDF)And cumulative distribution function(CDF)to analyze the outage probability.Finally,the simulation verifies the difference in the outage probability and network performance of the three schemes,which also shows that the proposed MJSR scheme has the best network performance.3.Under the fixed-distance transmission network model,the relay selection scheme is further applied,focusing on the Connection Outage Probability(COP)and Secrecy Outage Probability(SOP)of the eavesdropper network.First,in the No relay and No Jammer(NRNJ)selection scheme On the basis of,two kinds of relay-related selection strategies are proposed: the Optimal Jammer and No Relay(OJNR)selection scheme and the Joint Optimal Jammer and Relay(JOJR)selection scheme.Second,the use of random geometry The tool analyzes the COP and SOP of the network under the three schemes.Finally,the efficiency of the above three schemes under the fixed-distance transmission model is verified and compared through simulation.The simulation results show that the COP and SOP produced by our proposed OJNR scheme and JOJR scheme Compared with the NJNR scheme,the network security performance of the JOJR scheme is the best.