Hybrid intelligent reflective surfaces and relay assisted secure transmission scheme with power allocation
To improve the security and reliability of communication transmissions, this study proposes a novel hybrid secure scheme that combines a decode-and-forward (DF) relay and an intelligent reflecting surface (IRS) for down-linking multiple-input single-output systems. The proposal maximizes the minimum...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Electronics and Telecommunications Research Institute (ETRI)
2025-02-01
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| Series: | ETRI Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.4218/etrij.2023-0401 |
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| Summary: | To improve the security and reliability of communication transmissions, this study proposes a novel hybrid secure scheme that combines a decode-and-forward (DF) relay and an intelligent reflecting surface (IRS) for down-linking multiple-input single-output systems. The proposal maximizes the minimum achievable secrecy rate by utilizing alternating optimization algo-rithms to derive the closed-form solution of the beamforming vector, obtain the optimal power allocation factor with the successive convex approximation method, and obtain the optimal phase-shift matrix with the semi-definite relaxation method. The simulation results demonstrate that our approach out-performs state-of-the-art solutions using only the IRS or DF relay. Moreover, performance improves at a high signal-to-noise when increasing the number of IRSs. Notably, a proper power allocation is important to achieve optimal performance.
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| ISSN: | 1225-6463 2233-7326 |