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Optimal Channel Training Design for Secure Short-Packet Communications.

Dechuan Chen1,2, Jin Li1, Jianwei Hu3

  • 1College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China.

Sensors (Basel, Switzerland)
|February 11, 2023
PubMed
Summary

Optimizing channel training length is crucial for secure short-packet communications. This study determines the ideal training duration to maximize secrecy throughput, enhancing data confidentiality without extra resources.

Keywords:
average secrecy throughputchannel trainingphysical layer securityshort-packet communications

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Area of Science:

  • Information Theory
  • Wireless Communications
  • Cybersecurity

Background:

  • Physical layer security offers a resource-efficient method for securing short-packet communications.
  • Finite coding blocklength in these communications presents unique challenges for security optimization.
  • Effective channel training is essential for reliable and secure data transmission.

Purpose of the Study:

  • To investigate the optimal allocation of channel uses for training in secure short-packet communications.
  • To derive a closed-form expression for average achievable secrecy throughput considering finite blocklength.
  • To determine the optimal channel training length that maximizes secrecy throughput under reliability constraints.

Main Methods:

  • Utilizing finite blocklength information theory to derive an approximate expression for secrecy throughput.
  • Analyzing asymptotic average secrecy throughput in high signal-to-noise ratio (SNR) and infinite blocklength scenarios.
  • Deriving the optimal channel training length by maximizing the average secrecy throughput.

Main Results:

  • A closed-form expression for average achievable secrecy throughput was derived.
  • Asymptotic analysis provided insights into high SNR and infinite blocklength cases.
  • The optimal channel training length was determined to maximize secrecy throughput.

Conclusions:

  • The derived optimal channel training length significantly enhances secrecy throughput in short-packet communications.
  • Finite blocklength considerations are critical for optimizing physical layer security.
  • The proposed method offers a remarkable performance gain compared to existing schemes.