Secrecy Performance Analysis of the NOMA System on High-Speed Railway

Abstract

High-speed railway (HSR) wireless communications are required to ensure strict security. In this work, we study the secrecy performance of a nonorthogonal multiple access- (NOMA-) aided HSR wireless communication system in the case of an eavesdropping user. Specifically, applying NOMA technology to the HSR communication system can effectively improve the data rates. Therefore, we study the secrecy performance of the downlink NOMA system under the HSR wireless communication. In particular, the exact analytical results for the secrecy outage probability (SOP) based on no small-scale channel state information (CSI) are derived. We also provide all of the parameterizations for the proposed channel model. Finally, the correctness of theoretical derivation is verified via simulations. Results show the positive effect of utilizing the NOMA for enhancing wireless systems secrecy performance.

Mixed RF-VLC Relaying Systems for High-Speed Rail Communication

“…PLS has been extensively analyzed in literature for various relay-based dual-hop communication systems such as mixed RF-FSO, FSO-RF, RF-VLC, and VLC-RF, as evidenced by numerous studies [30][31][32][33][34][35][36][37][38][39]. Specifically, [30] and [31] proposed simultaneous wireless information and power transfer (SWIPT) based dual-hop mixed RF-FSO and mixed FSO-RF systems, respectively, utilizing power splitting methods and investigating the impact of SWIPT parameters on secrecy performance.…”

“…Lastly, reference [37] investigated the secrecy performance of a cooperative hybrid VLC-RF system, taking into account the random positions of the relay, legitimate receiver, and eavesdropper in different regions. Moreover, [38] and [39] proposed PLS approaches to secure the transmission link between the BS and HST by applying artificial noise and nonorthogonal multiple access (NOMA) techniques, respectively. However, none of the aforementioned studies address secrecy issues in HST communication that involve mixed RF and VLC links between the BS and UEs.…”

“…ab parameters are used to define the modulation schemes. For example, For the proposed system, the average BER can be expressed considering decoding errors at relay from[39, Eq. …”