Research On Secure Routing Technology Of Wireless Multi-hop Ad-hoc Networks

Wireless communication technology has developed rapidly in recent years,and various new networks are constantly emerging and becoming matured.Wireless ad hoc network is widely used in medical,transportation,military and other fields with these main features of no center,ad hoc,and not depending on basic communication facilities in these networks.On the one hand,the ad hoc feature of wireless ad hoc networks may make eavesdropping nodes widely distributed.On the other hand,due to the open feature of the transmission channel in the wireless scenario,the information could be easily eavesdropped or interfered during the communication process.In addition,due to the power limitation of the nodes in wireless ad hoc networks,the transmission of information between two parties of the legal communication usually requires multi-hop transmission of the relay nodes.The nature of multi-hop transmission may provide eavesdroppers with more eavesdropping opportunities,thereby causing great security risks.Therefore,this paper mainly studies the security transmission problem of wireless multi-hop ad hoc networks from the perspective of physical layer security,and focuses on how to ensure the security of information transmission on a multi-hop path of legal communication parties in the absence of a priori knowledge of the eavesdroppers.And how to further optimize the reliability of information transmission on a multi-hop path of legal communication parties on the basis of satisfying security.The specific work of this paper includes the following two aspectsFirstly,this paper studies the secure routing problem of wireless multi-hop ad hoc networks.In this study,this paper analyzes the impact on routing and system performance for both sending artificial noise and not sending artificial noise.First of all,when the relay nodes work in half-duplex mode,they only send confidential information.In this case,the expression of the system Secrecy Outage Probability(SOP)is derived under the assumption that the distribution of the eavesdroppers follows the Poisson point process(PPP).Then,in view of minimizing SOP,the optimal route from the source to the destination is obtained.Next,when the relay nodes work in full-duplex mode,they send both confidential information and artificial noise to interfere eavesdroppers.In this case,the expression of SOP and the optimal route are also obtained.Simulations results shown that the security performance of the proposed two routing algorithms outperform the shortest path algorithm,and the security performance is close to that of exhaustive searchingSecondly,under the premise of satisfying the system security,this paper studies the secure routing problem of wireless multi-hop ad hoc networks that further optimize the reliability of information transmission.The first research considered that the security of system transmission only needs to be guaranteed in many scenarios.For this reason,this paper studies how to further optimize the transmission reliability on the basis of satisfying security.A joint secure routing and power optimization algorithm for wireless multi-hop ad hoc networks is proposed.First of all,the expressions of Connection Outage Probability(COP)and SOP are derived under the assumption that the distribution of the eavesdroppers follows the Poisson Cluster Process(PCP)Then,in view of minimizing COP with the constraint of SOP,the optimal transmission power of each hop is derived for any given path.Based on that,the optimal route from the source to the destination is obtained.Simulations results shown that the security performance of the proposed algorithm outperforms the existing algorithms,and the security performance is close to that of exhaustive searchingIn summary,this paper studies the secure routing problem of wireless multi-hop ad hoc networks.The secure routing selection algorithm is studied to improve the security of information transmission on the multi-hop path between legal communication parties.Next,under the premise of satisfying the system security,the reliability of transmission is further improved through the joint secure routing and power optimization algorithm.