STAR-RIS Aided Secure MIMO Communication Systems
<|reference_start|>STAR-RIS Aided Secure MIMO Communication Systems: This paper investigates simultaneous transmission and reflection reconfigurable intelligent surface (STAR-RIS) aided physical layer security (PLS) in multiple-input multiple-output (MIMO) systems, where the base station (BS) transmits secrecy information with the aid of STAR-RIS against multiple eavesdroppers equipped with multiple antennas. We aim to maximize the secrecy rate by jointly optimizing the active beamforming at the BS and passive beamforming at the STAR-RIS, subject to the hardware constraint for STAR-RIS. To handle the coupling variables, a minimum mean-square error (MMSE) based alternating optimization (AO) algorithm is applied. In particular, the amplitudes and phases of STAR-RIS are divided into two blocks to simplify the algorithm design. Besides, by applying the Majorization-Minimization (MM) method, we derive a closed-form expression of the STAR-RIS's phase shifts. Numerical results show that the proposed scheme significantly outperforms various benchmark schemes, especially as the number of STAR-RIS elements increases.<|reference_end|>
@article{dong2024star-ris,
    title={STAR-RIS Aided Secure MIMO Communication Systems},
    author={Xiequn Dong, Zesong Fei, Xinyi Wang, Meng Hua, Qingqing Wu},
    journal={arXiv preprint arXiv:2404.01059},
    year={2024},
    archivePrefix={arXiv},
    eprint={2404.01059},
    primaryClass={cs.IT eess.SP math.IT}
}