Secure MISO-NOMA Transmission With Artificial Noise

Abstract

This paper studies a new secrecy beamforming (SBF) scheme for multiple-input single-output non-orthogonal multiple access (MISO-NOMA) systems. In particular, the proposed SBF scheme efficiently exploits artificial noise to protect the confidential information of two NOMA assisted legitimate users, such that only the eavesdropper's channel is degraded. Considering a practical assumption of the imperfect worst-case successive interference cancellation which is a unique character in employing NOMA transmission, we derive a closed-form expression for the secrecy outage probability to characterize the secrecy performance. After that, we carry out an analysis of secrecy diversity order to provide further insights about secure MISO-NOMA transmission. Numerical results are provided to demonstrate the accuracy of the developed analytical results and the effectiveness of the proposed SBF scheme. Index Terms-Non-orthogonal multiple access, multiple-input single-output, physical layer security, artificial noise.

Secure Transmit Antenna Selection Protocol for MIMO NOMA Networks Over Nakagami-m Channels

“…This is because the eavesdropper has the ability of powerfully detecting multi-user data without the interference in this case. Comparing with the previous works [19]- [21], we obtain the following different results:…”

“…Remark 1. The definition of SOP N,i , given in (27), is different from the previous works considering the scenario that N and E are always successfully decoding the message of F , i.e., Pr γ x F N Si ≥ γ th = 1 [17]- [20] and Pr γ x F ESi ≥ γ th = 1 [17]- [21].…”

“…Nowadays, PLS of NOMA systems is becoming an interesting topic [17]- [21]. In [17], the secrecy sum rate of a single-input single-output (SISO) NOMA system has been studied and the closed-form optimal solution for the power allocation has been derived, based on the users' quality of service (QoS) requirements.…”

“…Nevertheless, previous works on PLS in NOMA systems [17]- [21] have not covered the following issues. First, they have considered the scenario of SISO or MISO systems with Rayleigh fading channels.…”

“…Also, we provided the asymptotic expressions for the SOP and investigate the secrecy diversity. Moreover, we compare the secrecy performance in various scenarios adopting the two solutions, such as SISO versus MIMO, and compared our solutions with the previous works [19]- [21] to evaluate the benefits of our proposed protocol. Accordingly, to validate the analytical results, Monte Carlo simulation was employed.…”