Intelligent-Reflecting-Surface-Assisted Single-Input Single-Output Secure Transmission: A Joint Multiplicative...

Area of Science:

• Wireless communication security
• Physical-layer security
• Intelligent Reflecting Surfaces (IRS)

Background:

• Wireless channels' open nature makes systems vulnerable to eavesdropping and information leakage.
• This vulnerability is exacerbated in single-input single-output (SISO) systems with direct eavesdropper connections.

Purpose of the Study:

• To propose a novel IRS-assisted physical-layer secure transmission scheme for SISO systems.
• To ensure comprehensive system security irrespective of eavesdropper jamming status.
• To balance performance and complexity using IRS reflection strategies.

Main Methods:

• A joint transmitter perturbation and IRS reflection (JPR) scheme is proposed.
• Element-wise and group-wise reflected perturbation alignment (ERPA/GRPA) strategies are developed for IRS reflection.
• Ergodic secrecy rate (ESR) and secrecy outage probability (SOP) are analyzed to evaluate performance.

Main Results:

• The proposed JPR scheme guarantees system secrecy regardless of IRS jamming.
• ERPA/GRPA strategies offer a trade-off between performance and implementation complexity.
• Simulated and numerical results demonstrate the effectiveness of the proposed scheme over random phase reflection.

Conclusions:

• The novel IRS-assisted JPR scheme significantly enhances physical-layer security in SISO systems.
• ERPA/GRPA strategies provide flexible approaches to optimize security performance.
• The proposed method offers a robust solution for secure wireless communications.