Research On Synthesis Algorithm Of Directional Modulation Signal Using Sparse Arrays

In the information age,the communication industry has been rapidly developed as the cornerstone of the information age.Wireless communication technology has been widely used in production and life,however,due to the broadcast characteristics of wireless channels,wireless communication has the possibility of being eavesdropped,the security of wireless communication has received more and more attention.In traditional wireless communication,communication security is to encrypt the transmitted information with an encryption algorithm.This mechanism ensures the secure transmission of communication information through complex encryption algorithms,but with the rapid development of modern computing technology,the security of traditional secret key systems faces many challenges.The development of physical layer security communication technology has provided a new idea for the secure transmission of communication information.Different from the traditional encryption algorithm based solution,the physical layer security communication technology uses the characteristics of the wireless channel to realize the encryption of the information.This technology provides a new complement to security of the communication system.The direction modulation technology adopts different antenna structures,and the coupling effect between the antenna elements is used to realize the modulation of the communication information.The directional modulation signal synthesis algorithm based on sparse array can be understood as an optimization problem,in which the objective function and multiple constraints can be understood as different performance requirements of the direction modulation signal,and the synthesis of the direction modulation signal can be completed by solving different optimization problems.In this paper,two kinds of directional modulation signal synthesis algorithms based on sparse arrays are proposed by combining mixed integer programming and forward backward matrix beam method and convex optimization.The simulation results show that the direction modulated signal obtained by the algorithm can meet the performance requirements of different application scenarios,and compared with the existing directional modulation signal synthesis algorithm,there is a significant improvement in power utilization,safety performance and complexity of the radio frequency network.