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Rate Adaption for Secure HARQ-CC System with Multiple Eavesdroppers.

Yue Wu1, Shishu Yin1, Jian Zhou1

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

Entropy (Basel, Switzerland)
|December 8, 2020
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Summary
This summary is machine-generated.

This study optimizes secure data transmission in Hybrid Automatic Repeat reQuest with Chase Combining (HARQ-CC) systems facing multiple eavesdroppers. Optimized rates significantly enhance effective secrecy throughput (EST) while maintaining reliability.

Keywords:
chase combining (CC)effective secrecy throughput (EST)hybrid automatic repeat request (HARQ)physical layer security (PLS)secrecy outage probability (SOP)

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Area of Science:

  • Wireless communication security
  • Information theory
  • Network performance analysis

Background:

  • Secure transmission is crucial in wireless networks with multiple eavesdroppers.
  • Hybrid Automatic Repeat reQuest with Chase Combining (HARQ-CC) systems balance reliability and efficiency.
  • Latency constraints add complexity to secure communication design.

Purpose of the Study:

  • To analyze and optimize the effective secrecy throughput (EST) of HARQ-CC systems.
  • To investigate the impact of multiple eavesdroppers and latency on system performance.
  • To develop rate adaptation strategies for enhanced security and throughput.

Main Methods:

  • Analysis of key performance metrics: connection outage probability (COP), secrecy outage probability (SOP), and EST.
  • Formulation and solution of three rate adaptation optimization problems (code rate, secrecy redundancy rate, or both).
  • Consideration of COP and SOP constraints within optimization problems.

Main Results:

  • Approximated SOP shows strong agreement with Monte Carlo simulations under strict reliability constraints.
  • Optimized transmission rates effectively improve EST in the presence of multiple eavesdroppers and retransmissions.
  • Secrecy performance degrades as the number of eavesdroppers increases due to heightened information leakage.

Conclusions:

  • The proposed optimization strategies enhance secure communication efficiency in HARQ-CC systems.
  • The number of eavesdroppers is a critical factor negatively impacting secrecy performance.
  • Accurate modeling and optimization are essential for robust secure wireless transmission.