Design of a Reconfigurable Intelligent Surface Algorithm Based on Multiple-Input Multiple-Output

Reconfigurable Intelligent Surface (RIS) can improve the security of physical layer wireless communication by adjusting phase reflective unit. After analyzing common theoretical models and potential problems, this study proposes an alternative iterative model based on multiple input output (MIMO), designs transmitter, channel receiver. In addition, passive beamforming precoding matrix RIS was jointly optimized, Lagrangian dual relaxation (LDR) adopted to decouple nonconvex problem. that, active matrices were subjected calculation, optimized through cyclic programming at base station (BS). high convergence proposed algorithm proved MATLAB simulation. The results simulation demonstrate that joint framework maximize weighted sum rate (WSR), which in turn demonstrates feasibility our method. Finally, authors analyzed strong applicability technology complex networks with different volatility, revealing possibility future development.