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Physical-Layer Security Improvement with Reconfigurable Intelligent Surfaces for 6G Wireless Communication Systems.

Janghyuk Youn1, Woong Son1, Bang Chul Jung1

  • 1Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea.

Sensors (Basel, Switzerland)
|March 6, 2021
PubMed
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This study introduces a new reconfigurable intelligent surface (RIS)-based channel randomization (RCR) technique to enhance physical-layer security (PLS) in 6G wireless networks. The RCR method significantly improves achievable secrecy rates compared to existing methods.

Area of Science:

  • Wireless communication systems
  • Information theory
  • Signal processing

Background:

  • Reconfigurable intelligent surfaces (RISs) offer flexible and cost-effective signal manipulation for wireless networks.
  • RIS-aided techniques are crucial for enhancing data rate and energy efficiency in 6G systems.
  • Physical-layer security (PLS) is a critical concern in wireless networks, especially with increasing eavesdropping threats.

Purpose of the Study:

  • To propose and evaluate a novel RIS-based channel randomization (RCR) technique.
  • To improve the physical-layer security (PLS) of a time-division duplex (TDD) downlink cellular wire-tap network.
  • To enhance achievable secrecy rates in 6G wireless communication systems.

Main Methods:

  • A novel RIS-based channel randomization (RCR) technique is proposed for a TDD downlink cellular wire-tap network.
Keywords:
6G wireless communication systemintelligent reflecting surfacepassive eavesdropperphysical-layer securityreconfigurable intelligent surfacesecure communicationtera-hertz spectrum

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  • Multiple RISs pseudo-randomly generate reflection matrices for pilot signal duration (PSD) and data transmission duration (DTD).
  • The base station (BS) estimates channels using RIS reflection matrices and selects the user equipment (UE) with the best secrecy rate.

    • Main Results:

    • The proposed RCR technique demonstrates superior performance in terms of achievable secrecy rates.
    • Channel randomization via RIS effectively enhances physical-layer security against eavesdroppers.
    • The technique is particularly relevant for 6G systems utilizing tera-hertz (THz) spectrum bands with line-of-sight (LOS) channels.

    Conclusions:

    • The RCR technique offers a significant advancement in securing wireless communications.
    • RIS technology holds great potential for bolstering physical-layer security in future wireless networks.
    • This approach provides a viable solution for enhancing secrecy rates in 6G TDD systems.