Abstract
This paper studies the cell-edge user’s performance of a secure multiple-input single-output non-orthogonal multiple-access (MISO-NOMA) system under the Rayleigh fading channel in the presence of an eavesdropper. We suppose a worst-case scenario that an eavesdropper has ideal user detection ability. In particular, we suggest an optimization-based beamforming scheme with MISO-NOMA to improve the security and outage probability of a cell-edge user while maintaining the quality of service of the near-user and degrading the performance of the eavesdropper. To this end, power allocation coefficients are adjusted with the help of target data rates of both the users by utilizing a simultaneous wireless information and power transfer with time switching/power splitting protocol, where the near-user is used to forward the information to cell-edge user. The analytical results demonstrate that our beamformer analysis can achieve reduced outage probability of cell-edge user in the presence of the eavesdropper. Moreover, the provided simulation results validate our theoretical analysis and show that our approach improves the overall performance of a two-user cooperative MISO-NOMA system.
Highlights
Non-orthogonal multiple-access (NOMA) has been suggested as the emerging candidate technology to improve spectral efficiency by mapping multiple users on resource domains in order to enable 5G and future generation data networks, known as future communication networks [1]
ΛiA and λiB are the eigenvalues of using the SWIPT protocol where Alice (user-A) and user-B obtained through their respective correlation matrices, while l AE is the distance from user-A to Eve
The reason behind this assumption is to discuss the effect of position of user-A on the performance of the two-hop cooperative NOMA systems, where user-A moves along BS to user-B link
Summary
Non-orthogonal multiple-access (NOMA) has been suggested as the emerging candidate technology to improve spectral efficiency by mapping multiple users on resource domains (e.g., frequency and time) in order to enable 5G and future generation data networks, known as future communication networks [1]. Information of the far-user is detected by considering all other messages as noise, given that both the users will utilize complete resource block [7] As both the near- and far-users coexist in any communication network, the authors of [8] suggested and evaluated a novel cooperative NOMA algorithm to increase the faruser’s reliability. Despite the fact that cooperative NOMA systems with SWIPT have been considered in the literature, no research is conducted to investigate the outage probability minimization problem in such a way to design an energy-efficient beamforming strategy in a nonlinear. EH model to minimize the outage probability of far-user and degrade the performance of Eve for a secure multiple-input single-output non-orthogonal multiple-access (MISONOMA) communication.
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