Secure Multiuser Beamforming With Movable Antenna Arrays
For wireless communication systems requiring physical-layer security, this work introduces a novel MA-based approach that improves secrecy rates over fixed-antenna designs, though the gains are incremental.
This paper develops a movable antenna (MA)-enabled secure multiuser transmission framework to enhance physical-layer security, deriving expressions for achievable sum secrecy rate and proposing a joint optimization algorithm for digital beamforming and MA placement. Numerical results show that the MA-enabled design achieves higher secrecy rates than conventional fixed-position antenna arrays.
A movable antenna (MA)-enabled secure multiuser transmission framework is developed to enhance physical-layer security. Novel expressions are derived to characterize the achievable sum secrecy rate based on the secure channel coding theorem. On this basis, a joint optimization algorithm for digital beamforming and MA placement is proposed to maximize the sum secrecy rate via fractional programming and block coordinate descent. In each iteration, every variable admits either a closed-form update or a low-complexity one-dimensional or bisection search, which yields an efficient implementation. Numerical results demonstrate the effectiveness of the proposed method and show that the MA-enabled design achieves higher secrecy rates than conventional fixed-position antenna arrays.