Robust Optimization Algorithm For Full-duplex SWIPT System Based On Non-linear Energy Harvesting Model

With the continuous development of modern wireless communication technology,problems such as low utilization of spectral resources and wireless terminal energy limited become increasingly prominent,so the integration of full duplex and simultaneous wireless information and power transfer technology has attracted the attention of scholars.For wireless carrying communication system,the non-linear energy harvesting model has become a hot research point in recent years.It is difficult to obtain ideal and perfect channel state information in practice,so the imperfect channel model has received more and more attention.Based on the above technologies,this thesis conducts research on system model and optimization algorithm.In this thesis,a full-duplex multi-user multiple-input single-output wireless communication system based on non-linear energy harvesting model and imperfect channel model is studied,and a robust iterative optimization algorithm is designed for this kind of system.The upper and lower beamforming matrices and correlation vectors are jointly optimized to obtain the maximum average energy harvested by the client.In the optimization problem solving process,we convert the original non-convex problem into a convex problem that is easy to solve.A robust iterative optimization algorithm based on Newton's algorithm and semi-positive definite relaxation algorithm is proposed,which can improve the overall performance and robustness of the system studied in this thesis.In order to further improve the confidentiality of the system and prove the advantages of robust algorithm,this thesis also studies the secure communication system against eavesdropping,adds the artificial redundancy signal and etc.as optimization variables,a genetic algorithm based three-level iterative robust optimization algorithm is proposed.In order to verify the validity of the robust optimization algorithms in the two systems,a simulation platform is constructed,and the non-robust scheme of the proposed robust algorithm is compared.The simulation results show that the system performance under the robust algorithm is superior to the non-robust one,and the robust algorithm improves the confidentiality of information transmission in the anti-eavesdropping system.In addition,the non-linear energy harvesting model is compared with the traditional linear energy harvesting model by simulation.The results show that the non-linear energy harvesting model is more suitable for practical scenarios.