Security-Reliability Tradeoffs for Satellite–Terrestrial Relay Networks With a Friendly Jammer and Imperfect CSI

• Published in: IEEE transactions on aerospace and electronic systems Vol. 59; no. 5; p. 7004
• Main Authors: Nguyen, Tan Nhat, Trinh Van Chien, Tran, Dinh-Hieu, Van-Duc, Phan, Voznak, Miroslav, Chatzinotas, Symeon, Ding, Zhiguo, Poor, H Vincent
• Format: Journal Article
• Language: English
• Published: New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.10.2023
• Subjects: Fading; Jammers; Monte Carlo simulation; Parameters; Relay networks; Relay systems; Relaying; Reliability analysis; Security; Tradeoffs
• ISSN: 0018-9251; 1557-9603
• DOI: 10.1109/TAES.2023.3282934

This article proposes and analyzes the reliability and security tradeoff for a satellite–terrestrial (SatTer) relay system. Herein, a satellite sends confidential information to multiple ground users with the help of a relay base station (BS) in the presence of multiple eavesdroppers trying to wiretap the information. In particular, a friendly jammer is deployed near the relay BS to improve secure transmissions. Moreover, the nonidentical Rayleigh fading channels and imperfect channel state information are adopted for a general system model. Then, we consider both amplify-and-forward (AF) and decode-and-forward (DF) relaying strategies to give a full picture of the benefits of each method. In this context, we derive the closed-form expressions of the outage probability and intercept probability corresponding to AF- and DF-based relaying schemes, which is a high challenge and has not been investigated before. Then, Monte-Carlo simulations are conducted to evaluate the correctness of the mathematical analysis and the effectiveness of the proposed methods. Furthermore, the security and reliability trade-off of the SatTer system and the influences of various system parameters (e.g., satellite's transmit power, channel estimation errors, relay's transmit power, fading severity parameter, the average power of light-of-sight, and satellite's multipath components) on the system performance are shown.