Research On The Security Technology And Energy Efficiency Of The Physical Layer In Heterogeneous Network

With the popularization of heterogeneous network technology and the wide application of MIMO technology,the overall performance of the wireless communication system has been greatly improved.However,due to the openness of the wireless channel,there is a high risk of Information leakage.Thus,the security of the communication system is becoming more and more important.Different from the traditional high-level encryption method,the physical layer security technology can make full use of the randomness of the channel on the physical layer to achieve the purpose of secure communication.It is in the sense of information theory to ensure that the eavesdropper can’t obtain the confidential information,which has broad application prospects in the field of information security.Aiming at promoting the physical layer security of cell edge users in heterogeneous networks,this paper analyzes the performance of the users in twolayer heterogeneous network.By optimizing and analyzing the safety rate of the poor security performance that cell edge users present,we propose a security cooperative transmission scheme based on multi base station cooperation.Using the beamforming strategy to improve the received signal strength of the legal receiver and weaken the strength of the received signal at eavesdropper,we realize the information security of cell edge users.Finally,the accuracy of the algorithm is verified by the simulation.To solve the balance problem of legitimate users’ physical layer security and efficiency in the two-layer heterogeneous networks,this paper propose a cooperative beamforming scheme.What’s more,the co-channel interference is introduced to degrade the channel of the eavesdropper.The legal user’s security rate and energy efficiency of the system is derived and balanced by using the convex optimization theory and the power allocation scheme.Finally,through the simulation,from the aspect of secrecy rate and SINR,it is proved that the proposed algorithm has advantages in improving the system security and reducing the energy consumption.