STAR-RIS Aided Secure MIMO Communication Systems

doi:10.1109/TVT.2024.3400277

STAR-RIS Aided Secure MIMO Communication Systems

2024-10-01

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DOI：10.1109/TVT.2024.3400277

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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.

Keywords:

Array signal processing

MIMO communication

Optimization

Wireless communication

Security

Eavesdropping

Transforms

Simultaneous transmission and reflection reconfigurable intelligent surface

secure communication

multiple-input multiple-output

majorization-minimization

STAR-RIS Aided Secure MIMO Communication Systems

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