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<p>The concept of physical layer security combined with energy harvesting (EH) in wireless networks has received much attention for its potential in ensuring secure information transmission and extending network lifetime. In this paper, we investigate the physical layer security in an EH wireless network. The total communication progress is divided into two phases. In the first phase, friendly jammers (Js) powered by a power beacon (PB). And in the remaining phase, the U sends messages to BS with the help of the Js. To improve the physical layer security, we propose an optimal friendly jammer selection (OFJS) scheme and a suboptimal friendly jammer selection (SFJS) scheme depending on the availability and unavailability of channel state information (CSI) for wiretap link. For the purpose of comparison, we present the random friendly jammer selection (RFJS) scheme. We derive the closed-form expressions of connection outage probability (COP), secrecy outage probability and effective secrecy throughput (EST) for OFJS, SFJS and RFJS schemes over Nakagami-<i>m</i> fading channels to evaluate the system secrecy performance. Numerical results show that when N=8 and <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11276_2025_3949_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathop {\gamma }\nolimits _P }\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>γ</mi> <mi>P</mi> </msub> </math></EquationSource> </InlineEquation>=20dB, the EST performance improves by 57.21% for the OFJS scheme and by 47.55% for the SFJS scheme compared to the RFJS scheme, demonstrating the advantage of proposed OFJS and SFJS schemes in improving the physical layer security. Additionally, due to the influence of COP, three schemes reach the same EST upper bound in the high signal-to-noise ratio (SNR) region.</p>

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Friendly jammer selection improves physical layer security in energy harvesting communications over Nakagami-m channels

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Xiao Jiang,
  • Hui Geng,
  • Peishun Yan

摘要

The concept of physical layer security combined with energy harvesting (EH) in wireless networks has received much attention for its potential in ensuring secure information transmission and extending network lifetime. In this paper, we investigate the physical layer security in an EH wireless network. The total communication progress is divided into two phases. In the first phase, friendly jammers (Js) powered by a power beacon (PB). And in the remaining phase, the U sends messages to BS with the help of the Js. To improve the physical layer security, we propose an optimal friendly jammer selection (OFJS) scheme and a suboptimal friendly jammer selection (SFJS) scheme depending on the availability and unavailability of channel state information (CSI) for wiretap link. For the purpose of comparison, we present the random friendly jammer selection (RFJS) scheme. We derive the closed-form expressions of connection outage probability (COP), secrecy outage probability and effective secrecy throughput (EST) for OFJS, SFJS and RFJS schemes over Nakagami-m fading channels to evaluate the system secrecy performance. Numerical results show that when N=8 and \({\mathop {\gamma }\nolimits _P }\) γ P =20dB, the EST performance improves by 57.21% for the OFJS scheme and by 47.55% for the SFJS scheme compared to the RFJS scheme, demonstrating the advantage of proposed OFJS and SFJS schemes in improving the physical layer security. Additionally, due to the influence of COP, three schemes reach the same EST upper bound in the high signal-to-noise ratio (SNR) region.