Research On High Energy-Spectral Efficiency Cooperative Jamming Technology For Physical Layer Security

With the rapid development of wireless communication technology in recent years,communication security issues have been highly valued in various fields.Especially for certain special application scenarios,such as military and commercial secrets,communication security technology plays a vital role.When the cryptography encryption technology is adopted,the upper structure level of the node is often required to be high.In some distributed networks,there are a large number of single function nodes.The upper structure of such nodes is extremely simplified,and it is difficult to implement encryption and decryption functions.Physical layer security technology can be used as a supplement to the password encryption system to improve its deficiencies.As a supplement to the password encryption system,the physical layer security technology is gradually becoming a research focus in the field of communication security.The basic idea is to get the secret capacity by utilizing the gap between the channel capacity of the legal channel and the eavesdropping channel.In this area,cooperative jamming technology is one of the most mainstream means to ensure the security performance of the physical layer.However,when using cooperative jamming technology,the system will face the following problems.When using cooperative jamming technology,certain nodes are required to interfere with the eavesdropper,which means a large amount of infrastructure investment and post-maintenance costs.At the same time,the jamming node implements interference by generating and transmitting noise.That causes a large amount of energy and spectrum waste,the energy-spectral efficiency of the system is relatively low.In the case where the available resources of the wireless communication network are limited,the effective use strategy of resource energy is an important problem faced by the cooperative jamming technology.In this dissertation,for the problem that resources in resource-constrained cooperative interference networks cannot be effectively utilized,this paper proposes a cooperation mode that introduces secondary users to participate in cooperation and replaces traditional jamming nodes to implements interference.User selection and system resource optimization using strategies based on single and multiple cooperative users are also studied.At the same time,based on the situation of single-user collaboration,this paper proposes a win-win cooperation scheme based on the balance of benefits between primary and secondary users.In the multiple-users collaboration scenario,the issue of fairness among cooperative users was studied.This paper proposes a mathematical model based on user selection and resource allocation under a single cooperative user,and uses an efficient solution algorithm to give an optimal solution.Based on the multi-user cooperation mode,the user selection and energy efficiency strategy optimization model is established.Aiming at the complex intractability of the model,a two-stage solution scheme is proposed,and the specific application form of the scheme is given.The simulation results show that the energy and spectrum efficiency of the cooperative interference mode that introduces the participation of secondary users is greatly improved compared with the traditional jamming node.Moreover,the accuracy and solution efficiency of the proposed resource optimization scheme and user selection algorithm have reached a high level.In summary,this paper presents an effective scheme for introducing secondary users to implement cooperative jamming and an effective strategy for improving energy-spectral efficiency in a complex environment.