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.
Highlights
The rapid development of High-speed railway (HSR) has brought great convenience to people’s travel
High quality and data rate wireless communication are required for passenger services. e high-speed movement of HSR has brought about problems such as the wireless Doppler effect and signal shielding in train compartments, which will cause a series of phenomena, such as the difficulty of a mobile phone call and poor voice signal quality. us, railway transportation communication becomes an interesting topic
In the HSR scenario, the secure communication mode of the downlink nonorthogonal multiple access (NOMA) system is shown in Figure 1. e base station (BS) is located at the track side, and the height of the BS transmitting antenna relative to the horizontal plane is hz. e legitimate user is the passenger on the HSR
Summary
The rapid development of HSR has brought great convenience to people’s travel. High quality and data rate wireless communication are required for passenger services. To satisfy the fifth generation (5G) on HSR, the authors in [3] focus on the study of channel modeling combined with the 5G technology such as multiple-input multiple-output (MIMO) and millimeterwave (mm wave). Us, the authors in [6] analyzed and compared the performance of different NOMA schemes applied in HSR scenarios and proved that choosing the right NOMA scheme has a great effect on improving the data rate in HSR. In recent years, based on Wyner’s eavesdropping channel model, the main indicators to measure the secrecy of wireless communication systems are secrecy outage probability (SOP) and average secrecy capacity (ASC). To measure the secrecy performance of the system, the paper provides a closed-form expression for the SOP, and the simulation results show the positive effect of applying the NOMA for improving the system secrecy performance for HSR
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