Research On Physical Layer Directional Modulation Security Based On MIMO

Currently,the high demand for data transmission rate and the scarce wireless spectrum resources are the main driving forces for the development of wireless systems.The recent development of wireless technologies mainly focuses on using MIMO to enhance system performance.However,with the popularization of wireless systems in modern society,it is the main research direction to ensure the secure transmission of transmitted data in MIMO.In recent years,a physical layer security algorithm called direction modulation has become a research hotspot,which can prevent eavesdroppers from demodulating useful information in unexpected directions by adjusting the weight of the antenna array.In this paper,aiming at the problem that there is less direction of simultaneous secure transmission in the traditional direction modulation,the multi-beam direction modulation technology is implemented in the MIMO environment so that the base station can communicate securely with multiple users at the same time.Based on this,advanced physical layer security technology,that is,a multi-beam directional modulation model based on dual base stations,remedies the flaws in information leakage in the desired direction In this model,the dual base stations cooperatively communicate through CoMP technology in one cell,and both base stations use a multi-beam directional modulation technology to synchronously transmit data streams to the same user,and the data streams are processed by a dual base station collaborative encryption scheme.Compared with the traditional directional modulation scheme,this scheme not only realizes the secure communication between base station and multiple users,but also ensures that the data stream can be correctly demodulated only in the specific location where the legal user is located,not in all the areas in a specified direction.In addition,this paper proves the multi-directional security transfer performance of multi-beam directional modulation through simulation.In order to verify the confidentiality of the dual base station model,a simulation model is proposed to show the bit error rate(BER)of the received signal in the coverage area of two base stations.From the simulation results,the program in this paper can obviously reduce the range of low BER region to a specific region,which means that only the users in this region can demodulate correctly.