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<p>In the Internet of Things (IoT) and cyber-physical systems (CPSs), sensitive data encompassing personal privacy and industrial secrets is regularly collected, processed, and exchanged. Wireless communication plays a crucial role in enabling this, but its openness poses a threat, allowing unauthorized entities (eavesdroppers) to intercept transmissions. Physical layer security (PLS) emerges as a promising solution to counteract such attacks. In this paper, we investigate the issue of physical layer security within a two-hop MIMO wireless cooperative network used for data collection in IoT/CPS, where communication is facilitated by multiple relays. This investigation takes place over Nakagami-<i>m</i> fading channels in the presence of multiple non-colluding eavesdroppers. To improve the system’s security, we have considered the incorporation of cooperative jamming and opportunistic relaying techniques. In this paper, we have evaluated the secrecy performance of the system through metrics such as secrecy capacity, strictly positive secrecy capacity, outage probability, and average secrecy capacity. Analytical and simulation results reveal that stronger eavesdropper signals degrade secrecy, while increasing the Nakagami-<i>m</i> fading parameter, main signal strength and diversity order at the legitimate receiver enhance it. Monte Carlo simulations, along with comparisons to existing literature, validate the accuracy of our derived analytical expressions.</p>

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Physical Layer Security of Two-hop Massive MIMO-based IoT/CPS System Over Nakagami-m Fading Channels

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Parmila Devi,
  • Manoranjan Rai Bharti

摘要

In the Internet of Things (IoT) and cyber-physical systems (CPSs), sensitive data encompassing personal privacy and industrial secrets is regularly collected, processed, and exchanged. Wireless communication plays a crucial role in enabling this, but its openness poses a threat, allowing unauthorized entities (eavesdroppers) to intercept transmissions. Physical layer security (PLS) emerges as a promising solution to counteract such attacks. In this paper, we investigate the issue of physical layer security within a two-hop MIMO wireless cooperative network used for data collection in IoT/CPS, where communication is facilitated by multiple relays. This investigation takes place over Nakagami-m fading channels in the presence of multiple non-colluding eavesdroppers. To improve the system’s security, we have considered the incorporation of cooperative jamming and opportunistic relaying techniques. In this paper, we have evaluated the secrecy performance of the system through metrics such as secrecy capacity, strictly positive secrecy capacity, outage probability, and average secrecy capacity. Analytical and simulation results reveal that stronger eavesdropper signals degrade secrecy, while increasing the Nakagami-m fading parameter, main signal strength and diversity order at the legitimate receiver enhance it. Monte Carlo simulations, along with comparisons to existing literature, validate the accuracy of our derived analytical expressions.