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On the Secure Performance of Intelligent Reflecting Surface-Assisted HARQ Systems.

Yue Wu1, Kuanlin Mu1, Kaiyu Duan1

  • 1Department of Electronic and Information Engineering, Anhui University of Finance and Economics, Bengbu 233030, China.

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Summary
This summary is machine-generated.

This study enhances physical layer security (PLS) in hybrid automatic repeat request (HARQ) systems using intelligent reflecting surfaces (IRS). Increasing meta-surfaces boosts security, except in high SNR HARQ-IR systems where transmission numbers are key.

Keywords:
chase combining (CC)hybrid automatic repeat request (HARQ)incremental redundancy (IR)intelligent reflecting surface (IRS)physical layer security (PLS)

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Area of Science:

  • Wireless Communication
  • Information Security
  • Metamaterials

Background:

  • Physical layer security (PLS) is crucial for secure wireless communications.
  • Hybrid Automatic Repeat Request (HARQ) systems improve reliability.
  • Intelligent Reflecting Surfaces (IRS) offer a novel approach to enhance wireless environments.

Purpose of the Study:

  • To analyze the physical layer security performance of HARQ systems assisted by IRS.
  • To identify key factors influencing PLS enhancement in these systems.
  • To provide guidance for joint configuration of IRS and HARQ for secure communication.

Main Methods:

  • Derivation of closed-form expressions for connection outage probability (COP) and secrecy outage probability (SOP) using generalized-K (KG) and mixture gamma (MG) distributions.
  • Application of Mellin transform for HARQ with incremental redundancy (HARQ-IR).
  • Asymptotic analysis to investigate diversity and coding gain.

Main Results:

  • Acquired closed-form expressions for COP and SOP in HARQ-CC and HARQ-IR systems.
  • Demonstrated that increasing IRS meta-surfaces generally enhances main and wiretap channel gains.
  • Identified a specific high SNR region in HARQ-IR where increasing maximum transmission number is more beneficial than increasing meta-surfaces.

Conclusions:

  • The number of meta-surfaces is a primary factor for enhancing PLS in IRS-assisted HARQ systems.
  • The optimal configuration depends on the HARQ type and signal-to-noise ratio (SNR) regime.
  • Findings offer significant guidance for optimizing secure communication through joint IRS and HARQ design.