Physical layer security methods against eavesdropping on the far user by the near user in NOMA networks-A comparison

The close relationship between multiple access technologies and efficient spectrum utilization makes power-domain non-orthogonal multiple access (NOMA) an attractive solution that enables the support of high data rates, user fairness and low-latency communications in 5G and next generation networks. However, user pairing and successive interference cancelation applied in NOMA facilitates eavesdropping on the far user’s signal by the near user establishing security as a main issue in NOMA systems. Due to their numerous advantages, the means of physical layer security (PLS) are extremely suitable to combat internal NOMA eavesdropping. Up to the present only a few studies exist which examine different PLS approaches against eavesdropping on the far user by the near user. Among them are a joint beamforming and power allocation algorithm, an angle conversion method that alters the original signal constellation before transmission, and a directional modulation approach. In this paper, the available PLS methods against eavesdropping on the far user by the near user are investigated and the main advantages and drawbacks of these methods are compared.

• Dimitriya Mihaylova
• Iliyana Kuzmanova
• Viktor Stoynov
• Antoni Ivanov
• Zlatka Valkova-Jarvis
• Georgi Iliev

AIP Conference Proceedings, Volume 2570

https://aip.scitation.org/doi/abs/10.1063/5.0100040