面向物理层安全的可移动天线位置优化:一种盲优化方法OA

Movable antenna technology,by flexibly adjusting antenna positions,offers new degrees of freedom to actively shape wireless channels and enhance communication performance.Focusing on physical layer security,this paper investigates a single-input single-output communication scenario with multiple eavesdropping users.Unlike existing works that rely on precise channel state information,a blind optimization method is proposed,which does not depend on explicit channel expressions.Instead,it utilizes the received signal-to-noise ratio on the user side to jointly optimize the transmission power and movable antenna position,aiming to maximize the system secrecy rate.Specifically,the joint optimization problem of antenna position and power is formulated as a black-box optimization problem,and zero-order gradient approximation is employed to estimate the gradient of the objective function,enabling effective solution of the problem.Simulation results show that the proposed blind optimization method significantly outperforms fixed antenna and imperfect channel state information schemes,approaching the theoretical limit based on perfect channel information.