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Secrecy Analysis of Energy-Harvesting Backscatter Communications with Tag Selection in Nakagami-m Fading

Mohammad Nafees, Dharmendra Dixit, Arvind Kumar

TL;DR

This work addresses secrecy in energy-harvesting backscatter communications over Nakagami-$m$ fading by analyzing four tag-selection schemes (SOTS, METS, OTS, RTS). It derives closed-form and asymptotic expressions for secrecy outage probability and intercept probability, leveraging the non-linear EH model and Gamma-distributed fading components. The results reveal how the number of tags, node distances, and secrecy-rate thresholds shape security performance, with Rayleigh fading ($m=1$) recovered as a special case. Numerical results validate the analytical expressions and show that optimal tag selection (OTS) yields the strongest secrecy, while random selection (RTS) performs worst, providing practical guidance for secure BackCom deployments. The high-SNR asymptotics offer insightful scaling laws and verify robustness across parameter variations.

Abstract

Backscatter communication is an energy-efficient technique that enables sustainable wireless connectivity with a minimal environmental impact. In this paper, the secrecy performance of practical non-linear energy-harvesting backscatter communications with various tag selection schemes is analyzed in Nakagami-m fading channels. We consider four tag selection schemes: sub-optimal, minimal eaves-dropping, optimal, and random tag selection. Closed-form expressions for secrecy outage probability (SOP) and intercept probability (IP) are derived for each scheme, along with asymptotic expressions to provide deeper insights. The impact of system and fading parameters on SOP and IP is investigated, and simulation results are presented to validate the accuracy of the analytical expressions.

Secrecy Analysis of Energy-Harvesting Backscatter Communications with Tag Selection in Nakagami-m Fading

TL;DR

This work addresses secrecy in energy-harvesting backscatter communications over Nakagami- fading by analyzing four tag-selection schemes (SOTS, METS, OTS, RTS). It derives closed-form and asymptotic expressions for secrecy outage probability and intercept probability, leveraging the non-linear EH model and Gamma-distributed fading components. The results reveal how the number of tags, node distances, and secrecy-rate thresholds shape security performance, with Rayleigh fading () recovered as a special case. Numerical results validate the analytical expressions and show that optimal tag selection (OTS) yields the strongest secrecy, while random selection (RTS) performs worst, providing practical guidance for secure BackCom deployments. The high-SNR asymptotics offer insightful scaling laws and verify robustness across parameter variations.

Abstract

Backscatter communication is an energy-efficient technique that enables sustainable wireless connectivity with a minimal environmental impact. In this paper, the secrecy performance of practical non-linear energy-harvesting backscatter communications with various tag selection schemes is analyzed in Nakagami-m fading channels. We consider four tag selection schemes: sub-optimal, minimal eaves-dropping, optimal, and random tag selection. Closed-form expressions for secrecy outage probability (SOP) and intercept probability (IP) are derived for each scheme, along with asymptotic expressions to provide deeper insights. The impact of system and fading parameters on SOP and IP is investigated, and simulation results are presented to validate the accuracy of the analytical expressions.

Paper Structure

This paper contains 18 sections, 58 equations, 3 figures, 4 tables.

Table of Contents

  1. Introduction
  2. Related Works
  3. Motivation and Contributions
  4. System and Channel Model
  5. Performance Analysis with Tag Selection
  6. Exact SOP Analysis
  7. SOTS Protocol
  8. METS Protocol
  9. OTS Protocol
  10. RTS Protocol
  11. Exact IP Analysis
  12. Asymptotic Analysis
  13. Asymptotic SOP
  14. Asymptotic IP
  15. NUMERICAL AND SIMULATION RESULTS
  16. ...and 3 more sections

Figures (3)

  • Figure 1: System model illustrating energy-harvesting backscatter communications with multiple tags, a single destination, and an eavesdropper
  • Figure 2: (a): SOP versus $\Gamma_t$ for $N \in \{3,4\}$, (b): SOP versus $d'_d$ for $N \in \{3,4\}$, (c): SOP versus $d'_e$ for $N \in \{3,4\}$.
  • Figure 3: (a): SOP versus $\mathcal{R}$ for $N \in \{3,4\}$, (b): SOP versus $\Gamma_t$ for $m \in \{1, 2, 3, 4\}$, (c): IP versus $\Gamma_t$ for $N \in \{3,4\}$,.