Decoding Orders for Securing Untrusted NOMA

Thapar, Sapna; Mishra, Deepak; Saini, Ravikant

doi:10.1109/lnet.2021.3051757

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…In [4], [10], a novel secure decoding order is suggested to provide positive secrecy rate for both strong and weak users. In [11], feasible secure decoding orders are investigated to ensure a positive secrecy rate for all users in an N -user system.…”

Section: A Related Workmentioning

confidence: 99%

“…In contrast, the linear model can more effectively represent the relationship between RI and power of the received signal. In [11], though the linear SIC model has been considered, no SOP analysis has been done. Hence, to analyze the realistic impact of imperfect SIC, we investigate the secrecy performance analysis for a two-user untrusted NOMA system with linear SIC model, which to the best of our knowledge, has not been explored yet.…”

Section: B Research Gap and Motivationmentioning

confidence: 99%

“…In D 2 , both near and far users first decode signals of other user, perform SIC, and then decode their own signal [4]. Thereby, using linear SIC model [11]- [13], the achievable signal-to-interferenceplus-noise-ratio (SINR) Γ nm at U m , when U n is decoded by U m , where m, n ∈ N , is given as…”

Section: Pa Bounds From Secrecy Perspectivementioning

confidence: 99%

“…Similar to above approximations, closed-form SOP expressions for other decoding orders can also be obtained. For conventional decoding order D 1 , the asymptotic SOP expressions, s 1[C] and s 2[C] , are given in (11) and (12), respectively.…”

Section: B Asymptotic Approximationsmentioning

confidence: 99%

See 3 more Smart Citations

Secrecy Outage Probability Analysis for Downlink NOMA with Imperfect SIC at Untrusted Users

Thapar

Amin

Mishra

et al. 2021

2021 29th European Signal Processing Conference (EUSIPCO)

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Non-orthogonal multiple access (NOMA) has come to the fore as a spectrally efficient technique for fifth-generation networks and beyond. At the same time, NOMA faces severe security issues in the presence of untrusted users due to successive interference cancellation (SIC)-based decoding at receivers. In this paper, to make the system model more realistic, we consider the impact of imperfect SIC during the decoding process. Assuming the downlink mode, we focus on designing a secure NOMA communication protocol for the considered system model with two untrusted users. In this regard, we obtain the power allocation bounds to achieve a positive secrecy rate for both near and far users. Analytical expressions of secrecy outage probability (SOP) for both users are derived to analyze secrecy performance. Closed-form approximations of SOPs are also provided to gain analytical insights. Lastly, numerical results have been presented, which validate the exactness of the analysis and reveal the effect of various key parameters on achieved secrecy performance.

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Section: A Related Workmentioning

confidence: 99%

Section: B Research Gap and Motivationmentioning

confidence: 99%