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On the Average Secrecy Performance of Satellite Networks in Short Packet Communication Systems

Ramin Hashemi, Graciela Corral Briones, Risto Wichman

TL;DR

This work addresses the average secrecy performance of satellite networks using short packets in the finite-blocklength (FBL) regime under shadowed Rician fading. It derives a tractable lower bound $\tilde{R}$ on the average secrecy rate $\mathbb{E}[R_s]$ by bounding $\mathbb{E}[C_B]$ and $\mathbb{E}[C_E]$ via Jensen’s inequality and a Taylor-based approach, with parameters $\overline{\text{SNR}}_B$, $\overline{\text{SNR}}_E$, and channel moments $\phi_i(\cdot)$ appearing. They validate the results with Monte Carlo simulations and show that secrecy improves with larger blocklength $n$ and higher legitimate SNR, while Eve’s SNR degrades secrecy; directional antenna patterns at the transmitter can significantly reduce information leakage. The findings offer practical guidance for secure IoT- and space-based networks operating in short-packet regimes, including how beam orientation and geometry influence leakage.

Abstract

This paper investigates the secrecy performance of satellite networks in short packet communication systems under shadowed Rician fading (SRF). We derive a lower bound on the average achievable secrecy rate in the finite blocklength regime (FBL) and provide analytical insights into the impact of key secrecy-related performance indicators (KPIs). Monte Carlo simulations validate the theoretical framework, and demonstrate that increasing the blocklength and improving the legitimate receiver's signal-to-noise ratio (SNR) enhance secrecy, while a stronger eavesdropper degrades it. Additionally, we show that directional antenna patterns can effectively reduce information leakage and provide secure satellite communications in the short packet regime. These findings offer valuable guidance for designing secure and efficient satellite-based communication systems, particularly in IoT and space-based networks.

On the Average Secrecy Performance of Satellite Networks in Short Packet Communication Systems

TL;DR

This work addresses the average secrecy performance of satellite networks using short packets in the finite-blocklength (FBL) regime under shadowed Rician fading. It derives a tractable lower bound on the average secrecy rate by bounding and via Jensen’s inequality and a Taylor-based approach, with parameters , , and channel moments appearing. They validate the results with Monte Carlo simulations and show that secrecy improves with larger blocklength and higher legitimate SNR, while Eve’s SNR degrades secrecy; directional antenna patterns at the transmitter can significantly reduce information leakage. The findings offer practical guidance for secure IoT- and space-based networks operating in short-packet regimes, including how beam orientation and geometry influence leakage.

Abstract

This paper investigates the secrecy performance of satellite networks in short packet communication systems under shadowed Rician fading (SRF). We derive a lower bound on the average achievable secrecy rate in the finite blocklength regime (FBL) and provide analytical insights into the impact of key secrecy-related performance indicators (KPIs). Monte Carlo simulations validate the theoretical framework, and demonstrate that increasing the blocklength and improving the legitimate receiver's signal-to-noise ratio (SNR) enhance secrecy, while a stronger eavesdropper degrades it. Additionally, we show that directional antenna patterns can effectively reduce information leakage and provide secure satellite communications in the short packet regime. These findings offer valuable guidance for designing secure and efficient satellite-based communication systems, particularly in IoT and space-based networks.
Paper Structure (5 sections, 1 theorem, 23 equations, 5 figures, 1 table)

This paper contains 5 sections, 1 theorem, 23 equations, 5 figures, 1 table.

Table of Contents

  1. Introduction
  2. System Model
  3. Average Achievable Secrecy Rate
  4. Numerical Results
  5. Conclusion

Key Result

Theorem 1

A tractable lower bound for the average achievable secrecy rate in E_FBL is given by where $\tilde{R}$ is expressed as with and $\phi'_{\text{B}}(0)$ is given in phip_B.

Figures (5)

  • Figure 1: Illustration of the considered system model and the communication links between Alice, Bob, and Eve.
  • Figure 2: Average secrecy rate vs. channel blocklength.
  • Figure 3: Average secrecy rate vs. Bob's SNR.
  • Figure 4: Average secrecy rate vs. Eve’s SNR.
  • Figure 5: Impact of antenna orientation angle $\varphi$, and $d_{eb}$ on information leakage. A higher $\varphi$ results in reduced leakage.

Theorems & Definitions (2)

  • Theorem 1
  • proof