Systems Engineering and Electronics ›› 2023, Vol. 45 ›› Issue (3): 876-885.doi: 10.12305/j.issn.1001-506X.2023.03.30

• Communications and Networks • Previous Articles     Next Articles

Security transmission scheme for multi-relay system with a friendly jammer-assisted based on energy harvesting

Guangda ZHANG1,*, Qinghua REN1,2, Zhikai FAN1   

  1. 1. Information and Navigation College, Air Force Engineering University, Xi'an 710077, China
    2. Key Laboratory of Aerospace Information Applications, China Electronics Technology Group CorporationShijiazhuang 050081, China
  • Received:2021-09-24 Online:2023-02-25 Published:2023-03-09
  • Contact: Guangda ZHANG

Abstract:

The physical-layer security (PLS) transmission scheme joint with relay selection and friendly jammer-assisted based on energy harvesting (EH) is proposed to solve the energy-constrained system nodes and confidential signal security commission issues upon the multi-relay transmission system with multiple co-channel interferences. Firstly, a multi-relay system model based on decode-and-forward (DF) relay mode is established. Then, when the transmitter obtains only part of the channel state information. In the first time slot, the optimal relay selection scheme is proposed to maximize the secrecy capacity of the system. Simultaneously, friendly jammer harvests energy from the legitimate signals and co-channel interferences based on power splitting (PS) protocol in this phase. In the second time slot, the harvested energy by friendly jammer is used to send artificial noise(AN) to eavesdropper for cooperative jamming, to realize the transmission of confidential information in two time slots. Additionally, the closed-form expression of the system secrecy outage probability is derived. Finally, the Monte Carlo simulations method is used to analyze the influence of emission signal-to-noise ratio, the number of co-channel interferences, and the interference-to-noise ratio of co-channel interferences on the secrecy performance of the system. The correctness of the theoretical derivation is verified, and the simulation results show that the proposed scheme has a better secrecy performance.

Key words: physical-layer security, co-channel interference, relay selection, cooperative jamming, energy harvesting, secrecy outage probability

CLC Number: 

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