Secrecy Performance Analysis of Cooperative MISO NOMA Networks Over Nakagami-m Fading

Abstract

In this paper, we consider the physical layer security of a downlink cooperative multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) network over Nakagami-m fading. The network consists of a multi-antenna source, multiple decode-and-forward (DF) relays, and two users with different priority, in the presence of a passive eavesdropper. Specifically, we investigate the secure transmission from the source to the users via the help of the relays, in which the signals of the users might or might not be successfully decoded at the relays. Thus, we aim to design secure communication protocols for the considered system, where transmit antenna selection (TAS), maximal ratio transmission (MRT), and relay selection are employed based on the source-to-relays channel conditions. To characterize the secrecy performance, analytical and asymptotic expressions for the secrecy outage probability (SOP) of the overall system are derived. Our analytical results validated by Monte-Carlo simulations show that the secrecy performance of cooperative NOMA networks can be improved by increasing the number of antennas at the source and the number of relays. Comparing TAS and MRT, we conclude that TAS has lower complexity but can achieve the secrecy performane comparable with MRT. Finally, the results also indicate that our proposed protocol bring more general and practical insights with similar secrecy performance compared with the conventional solution.

KEYWORDS:

• MISO
• NOMA
• Physical layer security
• Secrecy capacity
• Secrecy outage probability
• SIC

Notes

1 In this paper, the antenna and relay selection solutions are performed based on the channel conditions of the links from the source to the relays for the purpose of improving the source-to-relay channel quality and the system performance [19,20].

Additional information

Notes on contributors

Tam Nguyen Kieu

Tam Nguyen Kieu was born in Phu Yen Province, Vietnam. He received his MSc from University of Transport and Communications, Vietnam in 2012. Now, he is a doctorial student at VSB-Technical University of Ostrava, Czech Republic. His research interests include the wireless communication, WiMax and energy harvesting. Email: [email protected]

Duc-Dung Tran

Duc-Dung Tran received the BE degree in electronics and telecommunications from University of Sciences, Hue, Vietnam, in 2013 and the MSc degree in computer sciences from Duy Tan University, Danang, Vietnam, in 2016. He currently works for Duy Tan University as a researcher. His research interests include 5G wireless communication networks, physical layer security, wireless energy harvesting networks, MIMO systems. Corresponding author. Email: [email protected]

Dac-Binh Ha

Dac-Binh Ha received the BS degree in radio technique, the MSc and PhD degrees in communication and information system from the Huazhong University of Science and Technology (HUST), China, in 1997, 2006, and 2009, respectively. He is currently the dean of Faculty of Electrical and Electronics Engineering, Duy Tan University, Danang, Vietnam. His research interests include secrecy physical layer communications, MIMO systems, combining techniques, cooperative communications, cognitive radio, wireless energy harvesting networks and image processing. Email: [email protected]

Miroslav Voznak

Miroslav Voznak is a professor at VSB-Technical University of Ostrava, Czech Republic. His research interests include wireless communications, next generation networks, IP telephony, security and speech quality, 5G wireless communication networks. Email: [email protected]