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<p>Sixth-generation (6G) mobile communication systems provide substantial challenges for legal communication security and covertness because of the intricacy of communication equipment and the vulnerability of wireless signals to information leakage. Power beacons (PBs) have also emerged as a practical remedy for problems related to energy efficiency. They allow wireless energy transmission to relay devices in Internet of Things (IoT) networks, supporting remote devices while guaranteeing low latency and spectrum efficiency. An innovative method that incorporates reconfigurable intelligent surfaces (RISs) into a secure downlink non-orthogonal multiple access (NOMA) network is presented in this research to address these issues. Furthermore, in the presence of a malevolent eavesdropper, our work integrates the usage of fountain codes (FCs) to further improve system security. Additionally, we emphasize the advantages of using PBs to facilitate the RIS-NOMA system downlink with a wirelessly powered base station. To evaluate the reliability and physical layer security (PLS) of the proposed system, we derive closed-form expressions for outage probability (OP), intercept probability (IP), and effective secrecy throughput (EST). The simulation’s results provide several crucial insights: i) The primary goal is to validate the derived analytical expressions; ii) The OP and IP of the secure downlink RIS-NOMA network trend upward and downward, respectively, as transmit signal-to-noise ratio (SNR) increases; iii) This study offers a solid foundation for future research on real-world implementations and substantially expands our understanding of security RIS-NOMA systems that employ FCs and PB-assisted energy harvesting; iv) The results demonstrate that security RIS-NOMA outperforms conventional security RIS-orthogonal multiple access (RIS-OMA) schemes.</p>

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Enabling Power Beacon for Downlink NOMA Security Systems Employing RIS with Fountain Codes

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Quy-Anh Bui,
  • Minh-Sang Van Nguyen,
  • Tran Trung Duy,
  • Phu Tran Tin

摘要

Sixth-generation (6G) mobile communication systems provide substantial challenges for legal communication security and covertness because of the intricacy of communication equipment and the vulnerability of wireless signals to information leakage. Power beacons (PBs) have also emerged as a practical remedy for problems related to energy efficiency. They allow wireless energy transmission to relay devices in Internet of Things (IoT) networks, supporting remote devices while guaranteeing low latency and spectrum efficiency. An innovative method that incorporates reconfigurable intelligent surfaces (RISs) into a secure downlink non-orthogonal multiple access (NOMA) network is presented in this research to address these issues. Furthermore, in the presence of a malevolent eavesdropper, our work integrates the usage of fountain codes (FCs) to further improve system security. Additionally, we emphasize the advantages of using PBs to facilitate the RIS-NOMA system downlink with a wirelessly powered base station. To evaluate the reliability and physical layer security (PLS) of the proposed system, we derive closed-form expressions for outage probability (OP), intercept probability (IP), and effective secrecy throughput (EST). The simulation’s results provide several crucial insights: i) The primary goal is to validate the derived analytical expressions; ii) The OP and IP of the secure downlink RIS-NOMA network trend upward and downward, respectively, as transmit signal-to-noise ratio (SNR) increases; iii) This study offers a solid foundation for future research on real-world implementations and substantially expands our understanding of security RIS-NOMA systems that employ FCs and PB-assisted energy harvesting; iv) The results demonstrate that security RIS-NOMA outperforms conventional security RIS-orthogonal multiple access (RIS-OMA) schemes.