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Secure Communication of Active RIS Assisted NOMA Networks

Xuehua Li, Yingjie Pei, Xinwei Yue, Yuanwei Liu, Zhiguo Ding

TL;DR

This paper investigates the physical layer security of the ARIS assisted non-orthogonal multiple access (NOMA) networks with the attendance of external and internal eavesdroppers and indicates that the secrecy throughput performance of ARIS-NOMA networks outperforms that of PRIS-NOMA and ARIS/PRIS-OMA networks.

Abstract

As a revolutionary technology, reconfigurable intelligent surface (RIS) has been deemed as an indispensable part of the 6th generation communications due to its inherent ability to regulate the wireless channels. However, passive RIS (PRIS) still suffers from some pressing issues, one of which is that the fading of the entire reflection link is proportional to the product of the distances from the base station to the PRIS and from the PRIS to the users, i.e., the productive attenuation. To tackle this problem, active RIS (ARIS) has been proposed to reconfigure the wireless propagation condition and alleviate the productive attenuation. In this paper, we investigate the physical layer security of the ARIS assisted non-orthogonal multiple access (NOMA) networks with the attendance of external and internal eavesdroppers. To be specific, the closed-form expressions of secrecy outage probability (SOP) and secrecy system throughput are derived by invoking both imperfect successive interference cancellation (ipSIC) and perfect SIC. The secrecy diversity orders of legitimate users are obtained at high signal-to-noise ratios. Numerical results are presented to verify the accuracy of the theoretical expressions and indicate that: i) The SOP of ARIS assisted NOMA networks exceeds that of PRIS-NOMA, ARIS/PRIS-assisted orthogonal multiple access (OMA); ii) Due to the balance between the thermal noise and residual interference, introducing excess reconfigurable elements at ARIS is not helpful to reduce the SOP; and iii) The secrecy throughput performance of ARIS-NOMA networks outperforms that of PRIS-NOMA and ARIS/PRIS-OMA networks.

Secure Communication of Active RIS Assisted NOMA Networks

TL;DR

This paper investigates the physical layer security of the ARIS assisted non-orthogonal multiple access (NOMA) networks with the attendance of external and internal eavesdroppers and indicates that the secrecy throughput performance of ARIS-NOMA networks outperforms that of PRIS-NOMA and ARIS/PRIS-OMA networks.

Abstract

As a revolutionary technology, reconfigurable intelligent surface (RIS) has been deemed as an indispensable part of the 6th generation communications due to its inherent ability to regulate the wireless channels. However, passive RIS (PRIS) still suffers from some pressing issues, one of which is that the fading of the entire reflection link is proportional to the product of the distances from the base station to the PRIS and from the PRIS to the users, i.e., the productive attenuation. To tackle this problem, active RIS (ARIS) has been proposed to reconfigure the wireless propagation condition and alleviate the productive attenuation. In this paper, we investigate the physical layer security of the ARIS assisted non-orthogonal multiple access (NOMA) networks with the attendance of external and internal eavesdroppers. To be specific, the closed-form expressions of secrecy outage probability (SOP) and secrecy system throughput are derived by invoking both imperfect successive interference cancellation (ipSIC) and perfect SIC. The secrecy diversity orders of legitimate users are obtained at high signal-to-noise ratios. Numerical results are presented to verify the accuracy of the theoretical expressions and indicate that: i) The SOP of ARIS assisted NOMA networks exceeds that of PRIS-NOMA, ARIS/PRIS-assisted orthogonal multiple access (OMA); ii) Due to the balance between the thermal noise and residual interference, introducing excess reconfigurable elements at ARIS is not helpful to reduce the SOP; and iii) The secrecy throughput performance of ARIS-NOMA networks outperforms that of PRIS-NOMA and ARIS/PRIS-OMA networks.
Paper Structure (22 sections, 10 theorems, 58 equations, 10 figures, 1 table)

This paper contains 22 sections, 10 theorems, 58 equations, 10 figures, 1 table.

Table of Contents

  1. Introduction
  2. Motivations and Contributions
  3. Organization and Notations
  4. Network Model
  5. Network Descriptions
  6. Signal Model
  7. External Wiretapping Scenario
  8. Internal Wiretapping Scenario
  9. ARIS-NOMA Networks with On-off Control Scheme
  10. Secrecy Performance Evaluation
  11. Statistical Properties for Eavesdropping Channels
  12. External Wiretapping Scenario
  13. Internal Wiretapping Scenario
  14. Secrecy Outage Probability Analysis
  15. External Wiretapping Scenario
  16. ...and 7 more sections

Key Result

Lemma 1

By utilizing on-off control scheme, the CDF of SINR for user n to decode its own signal with ipSIC can be given by where ${c_n} = {a_n}P_{BS}^{act}{\kappa ^2}$, ${\Xi _n} = \frac{{{v_n} + {\varpi}P_{BS}^{act}{\Omega _{ipu}}{\zeta _d}}}{{{c_n}{\Omega _{br}}{\Omega _{rn}}}}$, ${v_n} = {\kappa ^2}\sigma _t^2Q{\Omega _{rn}} + {\sigma ^2}$, ${G_d} = \frac{{{{\left( {D!} \right)}^2}}}{{{{\zeta _d}}{{\l

Figures (10)

  • Figure 1: An illustration of ARIS assisted NOMA secure communication networks, where the ARIS consisting of a novel reflecting-type amplifier can simultaneously reflects and amplifies signals to user n and user f located in the same NOMA cluster.
  • Figure 2: The SOP versus system power budget under ARIS-NOMA and PRIS-NOMA networks in external eavesdropping scenarios, with M = 40, P = 2 and Q = 20.
  • Figure 3: The SOP versus system power budget under ARIS-NOMA, ARIS/PRIS-OMA and conventional relaying schemes in external eavesdropping scenarios, with M = 40, P = 2, Q = 20 and $R_{OMA}$ = 0.1 BPCU.
  • Figure 4: The system SOP versus different number of reconfigurable elements under external eavesdropping scenario, with ${P_{tot}} =$ -40 dBm, $\sigma _t^2 =$ -40 dBm and ${\left| {{h_{ipu}}} \right|^2} = {\left| {{h_{ipe}}} \right|^2} =$ -80 dB.
  • Figure 5: The SOP versus system power budget under external eavesdropping scenario, with M = 40, P = 2, Q = 20 and ${\left| {{h_{ipu}}} \right|^2} = {\left| {{h_{ipe}}} \right|^2} =$ -80 dB.
  • ...and 5 more figures

Theorems & Definitions (17)

  • Lemma 1
  • proof
  • Lemma 2
  • Lemma 3
  • proof
  • Lemma 4
  • Lemma 5
  • Theorem 1
  • proof
  • Theorem 2
  • ...and 7 more