Research On Physical Layer Security Technology Of Wireless Network Based On Inteference Collaboration

With the development of communication system,the means of intercepting information has also been improved,and the information security problem has been paid more and more attention.Because of the open characteristic of wireless communication,it is possible to eavesdrop the signal in the reachable range.The traditional algorithm of protecting information security is based on the principle of cryptography,that is,encryption algorithm is used to encrypt the sent information,To unlock a message without the related key,the eavesdroppers have to face a very completate problem.However,due to the continuous development of computer technology,especially the significantly development of computer computing power,the security transmission mechanism based on traditional cryptography will face greater challenge.Physical layer security is based on the definition of Shannon's absolute information security.Based on the principle of physical layer security,this paper analyzes the security performance of wireless network,puts forward an effective protection strategy for the most basic one-hop transmission node pair,and proposes a new optimization model for multi-hop cooperative interference scenarios to improve the security performance.The main contents and work of this paper include:(1)The first part introduces the basic concept of physical layer security,related basic knowledge and technical implementation,and investigates the research status of physical layer security technology.(2)A model of cooperative protection of one-hop receiving and transmitting nodes is proposed,and an optimized algorithm of transmitting power allocation is proposed.Aiming at the most likely unsafe transmission area,a strategy of setting cooperative interference node behind the sending node is proposed,and how to optimize the interference transmission power is analyzed.At the same time,how to further improve the security performance by sending self-interference through the receiving node is studied.(3)A power optimization model of multi-hop relay transmission cooperative interference based on cooperative interference and self-interference is proposed.An adaptive particle swarm optimization algorithm and exhaustive search method are designed to realize the optimization strategy of physical layer security.In addition,a capacity optimization model based on the threshold constraint of secure connection probability is proposed,and the adaptive algorithm is used for optimization analysis.Finally,the existing secure transmission path selection algorithm and cooperative interference power optimization algorithm are combined to further improve the security.