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Secrecy Performance Analysis of RIS Assisted Ambient Backscatter Communication Networks

Yingjie Pei, Xinwei Yue, Chongwen Huang, Zhiping Lu

TL;DR

The secrecy outage behavior of RIS-AmBC networks exceeds that of conventional AmBC networks and the secrecy throughput and energy efficiency are strongly influenced by the reflecting coefficient and eavesdropper’s wiretapping ability.

Abstract

Reconfigurable intelligent surface (RIS) and ambient backscatter communication (AmBC) have been envisioned as two promising technologies due to their high transmission reliability as well as energy-efficiency. This paper investigates the secrecy performance of RIS assisted AmBC networks. New closed-form and asymptotic expressions of secrecy outage probability for RIS-AmBC networks are derived by taking into account both imperfect successive interference cancellation (ipSIC) and perfect SIC (pSIC) cases. On top of these, the secrecy diversity order of legitimate user is obtained in high signal-to-noise ratio region, which equals \emph{zero} and is proportional to the number of RIS elements for ipSIC and pSIC, respectively. The secrecy throughput and energy efficiency are further surveyed to evaluate the secure effectiveness of RIS-AmBC networks. Numerical results are provided to verify the accuracy of theoretical analyses and manifest that: i) The secrecy outage behavior of RIS-AmBC networks exceeds that of conventional AmBC networks; ii) Due to the mutual interference between direct and backscattering links, the number of RIS elements has an optimal value to minimise the secrecy system outage probability; and iii) Secrecy throughput and energy efficiency are strongly influenced by the reflecting coefficient and eavesdropper's wiretapping ability.

Secrecy Performance Analysis of RIS Assisted Ambient Backscatter Communication Networks

TL;DR

The secrecy outage behavior of RIS-AmBC networks exceeds that of conventional AmBC networks and the secrecy throughput and energy efficiency are strongly influenced by the reflecting coefficient and eavesdropper’s wiretapping ability.

Abstract

Reconfigurable intelligent surface (RIS) and ambient backscatter communication (AmBC) have been envisioned as two promising technologies due to their high transmission reliability as well as energy-efficiency. This paper investigates the secrecy performance of RIS assisted AmBC networks. New closed-form and asymptotic expressions of secrecy outage probability for RIS-AmBC networks are derived by taking into account both imperfect successive interference cancellation (ipSIC) and perfect SIC (pSIC) cases. On top of these, the secrecy diversity order of legitimate user is obtained in high signal-to-noise ratio region, which equals \emph{zero} and is proportional to the number of RIS elements for ipSIC and pSIC, respectively. The secrecy throughput and energy efficiency are further surveyed to evaluate the secure effectiveness of RIS-AmBC networks. Numerical results are provided to verify the accuracy of theoretical analyses and manifest that: i) The secrecy outage behavior of RIS-AmBC networks exceeds that of conventional AmBC networks; ii) Due to the mutual interference between direct and backscattering links, the number of RIS elements has an optimal value to minimise the secrecy system outage probability; and iii) Secrecy throughput and energy efficiency are strongly influenced by the reflecting coefficient and eavesdropper's wiretapping ability.
Paper Structure (13 sections, 8 theorems, 46 equations, 8 figures, 1 table)

This paper contains 13 sections, 8 theorems, 46 equations, 8 figures, 1 table.

Table of Contents

  1. Introduction
  2. Organization and Notations
  3. Network Model
  4. Signal Model
  5. RIS-AmBC Networks with On-off Control Scheme
  6. Secrecy Performance Evaluation
  7. Statistical Properties for Eavesdropping Channels
  8. Secrecy Outage Probability Analysis
  9. Secrecy Diversity Order
  10. Secrecy Throughput Analysis
  11. Secrecy Energy Efficiency Analysis
  12. Numerical Results
  13. Conclusion

Key Result

Lemma 1

By utilizing the coherent phase shift, the cumulative distribution function (CDF) of SINR for LU to decode the data signal in RIS-AmBC networks is given by where $\rho = {{{P_s}} \mathord{\left/ {\newline} \right. \nulldelimiterspace} {\sigma _u^2}}$ refers to the transmitting signal-to-noise ratio (SNR). $\alpha = \left[ {{\pi ^2}M/\left( {16 - {\pi ^2}} \right)} \right] - 1$ and $\beta = \le

Figures (8)

  • Figure 1: An illustration of RIS assisted secure AmBC networks.
  • Figure 2: The SOP versus transmitting power in RIS-AmBC networks.
  • Figure 3: The SOP versus the number of RIS elements in RIS-AmBC networks.
  • Figure 4: The SOP versus the horizontal distance of RIS in RIS-AmBC networks.
  • Figure 5: The secrecy throughput versus transmitting power in RIS-AmBC networks.
  • ...and 3 more figures

Theorems & Definitions (17)

  • Lemma 1
  • proof
  • Lemma 2
  • proof
  • Lemma 3
  • proof
  • Lemma 4
  • Theorem 1
  • proof
  • Theorem 2
  • ...and 7 more