Intelligent Reflecting Surface Aided Secure Communications for NOMA Networks

Gong, Caihong; Yue, Xinwei; Wang, Xiyuan; Dai, Xiaoming; Zou, Runmin; Essaaidi, Mohamed; Cui, Jianuo

doi:10.1109/tvt.2021.3129075

Cited by 37 publications

(12 citation statements)

References 34 publications

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“…Figure 4 shows average BEP of NU in the proposed MR‐NOMA, RIS‐NOMA, 13 and RIS‐selection‐based transmission over multiple RISs (RSBT) 20 . The NU's performance is significantly improved in MR‐NOMA, as compared to RIS‐NOMA and RSBT.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Single RIS/intelligent reflecting surfaces (IRSs)-assisted NOMA system has been extensively explored in literature. 1,[12][13][14] Further, recently, multiple RIS/IRS was first introduced in Han et al 15 Double IRS-assisted wireless communication with a single antenna at the BS and the user is considered in Han et al 15 Results show that deploying two cooperative IRSs are significantly better than deploying a single IRS. Mei and Zhang 16 have proposed multiple IRS-assisted communication system with multihop reflection and have derived end-to-end channel power by using optimal beamforming.…”

Section: Introductionmentioning

confidence: 99%

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Multiple reconfigurable intelligent surfaces assisted downlink NOMA system

Kumar

Sharma

Deka

et al. 2022

Int J Communication

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Summary Paper has considered multiple reconfigurable intelligent surfaces (RISs) assisted downlink non‐orthogonal multiple accesses (NOMA) system, referred to as MR‐NOMA. Multiple RISs create a line‐of‐sight (LOS) channel between BS and users to improve network coverage, especially in high frequencies and severe path attenuation scenarios. In MR‐NOMA, all RISs are in series and activated simultaneously; therefore, multiplicative beamforming gain from the inter‐RIS channels is achieved. Bit error probability (BEP) under the Rician fading channel is derived and compared with simulation results. It is observed that BEP performance depends on the number of passive reflecting elements, Rician factor, and positions of RISs panels in the MR‐NOMA.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiple reconfigurable intelligent surfaces assisted downlink NOMA system

Kumar

Sharma

Deka

et al. 2022

Int J Communication

View full text Add to dashboard Cite

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“…The utilization of IRS can simultaneously create enhanced beams to the intended legitimate receivers while the eavesdropping signal-to-noise ratio can be effectively suppressed, and thus achieving a higher secrecy rate. Motivated by this, robust and secure beamforming with IRS has been investigated to benefit the PLS of NOMA networks [12]- [15]. The secrecy performance of IRS-NOMA networks was studied by Gong et al in [12] under circumstance of onebit coding scheme, which demonstrated potential security advantages of utilizing IRS in NOMA.…”

Section: Physical Layer Security In Irs-noma Networkmentioning

confidence: 99%

“…Motivated by this, robust and secure beamforming with IRS has been investigated to benefit the PLS of NOMA networks [12]- [15]. The secrecy performance of IRS-NOMA networks was studied by Gong et al in [12] under circumstance of onebit coding scheme, which demonstrated potential security advantages of utilizing IRS in NOMA. In [13], with perfect channel state information (CSI), Feng et al investigated the max-min fairness problem of uplink IRS-NOMA system with an eavesdropper, where artificial noise is transmitted together with confidential messages and the minimal secrecy rate is maximized by jointly optimizing the active beamforming at users and passive beamforming at IRS.…”

Section: Physical Layer Security In Irs-noma Networkmentioning

confidence: 99%

Secure Beamforming for IRS-Enhanced NOMA Networks

Wang

Cao

Sheng

et al. 2023

IEEE Wireless Commun.

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Owing to the increasing demand of higher spectrum efficiency and large-scale connectivity, non-orthogonal multiple access (NOMA) has become a highly competitive candidate for the upcoming sixth-generation (6G) systems. Nevertheless, the instable wireless propagation environment and potential wireless security risk become bottlenecks in applications of NOMA. Fortunately, intelligent reflecting surface (IRS) that can construct the three-dimensional beamforming and reconfigure the channels emerges as a highly efficient technology to break through the limitations of NOMA. Thus, in this article, we first present an overview of NOMA, and particularly illustrate its main shortcomings and security risks. Then, we introduce the IRS technology and provide further enhancement by applying IRS to NOMA networks. In addition, typical security threats in IRS-NOMA networks are shown, followed by two countermeasures based on the joint transmit beamforming and IRS reflecting beamforming towards external and internal eavesdropping, respectively. Simulation results are carried out to demonstrate the feasibility and effectiveness of these two schemes. Several challenges and future directions are also discussed.

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“…The detailed comparison between IRS-NOMA with IRS-OMA is presented in [14]. Moreover, the interplay between IRS and NOMA is widely investigated for various technologies like unmanned aerial vehicle (UAV) [15], simultaneous wireless information and power transfer (SWIPT) [16], wireless powered communication networks (WPCNs) [17], mobile edge computing (MEC) [18], Backscatter Communications (BC) [19], and physical layer security (PLS) [20].…”

Section: Introduction and Motivationsmentioning

confidence: 99%

Energy-Efficient IRS-Aided NOMA Beamforming for 6G Wireless Communications

Ihsan¹,

Chen²,

Asif³

et al. 2022

Preprint

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This manuscript presents an energy-efficient alternating optimization framework based on intelligent reflective surfaces (IRS) aided non-orthogonal multiple access beamforming (NOMA-BF) system for 6G wireless communications. Specifically, this work proposes a centralized IRS-enabled design for the NOMA-BF system to optimize the active beamforming and power allocation coefficient (PAC) of users at the transmitter in the first stage and passive beamforming at IRS in the 2nd stage to maximize the energy efficiency (EE) of the network. However, an increment in the number of supportable users with the NOMA-BF system will lead to NOMA user interference and intercluster interference (ICI). To mitigate the effect of ICI, first zero-forcing beamforming along with efficient user clustering algorithm is exploited and then NOMA user interference is tackled efficiently through a proposed iterative algorithm that computes PAC of NOMA user through simplified closed-form expression under the required system constraints. In the 2nd stage, the problem of passive beamforming is solved through a technique based on difference-of-convex (DC) programming and successive convex approximation (SCA). Simulation results demonstrate that the proposed alternating framework for energyefficient IRS-assisted NOMA-BF system can achieve convergence within a few iterations and provide efficient performance in terms of EE of the system with low complexity.

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Intelligent Reflecting Surface Aided Secure Communications for NOMA Networks

Cited by 37 publications

References 34 publications

Multiple reconfigurable intelligent surfaces assisted downlink NOMA system

Multiple reconfigurable intelligent surfaces assisted downlink NOMA system

Secure Beamforming for IRS-Enhanced NOMA Networks

Energy-Efficient IRS-Aided NOMA Beamforming for 6G Wireless Communications

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