Abstract
In this paper, we investigate cooperative secure transmission in non-orthogonal multiple access (NOMA) networks where a source (Alice) intends to transmit confidential messages to one legitimate user with high-level security requirement (LU1), and serve another normal one (LU2) simultaneously. In order to enhance the transmission security, a cooperative jammer (Charlie) is employed to confuse multiple non-colluding eavesdroppers (Eves). Taking both secrecy outage restriction of LU1 and the desired quality of service (QoS) requirement of LU2 into consideration, we propose an adaptive power allocation strategy for maximizing secrecy rate. Numerical results are provided to validate that our proposed scheme significantly outperforms the conventional NOMA secure transmission scheme.
Highlights
Non-orthogonal multiple access (NOMA), which has shown the potential to significantly improve spectral efficiency, is envisaged as a promising technique for the 5G wireless networks [1,2].In contrast to the conventional orthogonal multiple access (OMA), NOMA exploits the power domain to serve multiple users simultaneously [3]
Inspired by its superior performance in improving spectrum efficiency and realizing larger coverage, intensive efforts have been devoted to investigating cooperative NOMA recently for further transmission reliability improvement [7,8,9,10,11]
We study cooperative secure transmission in two-user MISO-NOMA networks where one user (LU1) desires a high data rate with security requirement, while the other one (LU2)
Summary
Non-orthogonal multiple access (NOMA), which has shown the potential to significantly improve spectral efficiency, is envisaged as a promising technique for the 5G wireless networks [1,2]. The works in [16] analyzed analytical and asymptotical expressions of SOP under both random and max-min relay selection schemes for jammer-aided cooperative NOMA networks. In [16,17,18], the power allocation factor is considered to be fixed in jammer-aided cooperative NOMA networks, while, in this paper, taking both security and performance guarantee into account, an efficient adaptive approach has been developed to obtain the optimal power allocation factor for the secrecy rate maximization. Different from the work of [21] in which only one user was served by Alice, in this paper, we investigate cooperative secure transmission in NOMA networks where a source (Alice) intends to transmit confidential messages to one legitimate user with high-level security requirement (LU1), and serve another normal one (LU2) simultaneously. Exponential distribution with parameter λ and Gamma distribution with shape parameter α and rate parameter β is denoted as Exp(λ) and Γ(α, β), respectively
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