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Vehicular Communications

Maximizing secrecy performance for UAV-based two-way relay systems utilizing friendly jamming

Thanh Trung Nguyen, Tran Manh Hoang, Le The Dung, Phuong T. Tran

Published Mar 21, 2026• 0 citations
Publisher
DOI
10.1016/j.vehcom.2026.101020

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In this paper, we examine the secrecy performance of two-way relaying between a multiple antenna base station (BS) and a single antenna mobile user (MU) in the presence of a multiple antenna friendly jammer (FJ). We consider the untrusted relaying scenario where an amplify-and-forward relay is both a necessary helper and a potential eavesdropper. To maximize the instantaneous secrecy sum rate, we derive new closed-form solutions for the optimal power allocation (OPA) between the BS and MU under the scenario of relaying with friendly jamming (WFJ). Based on the OPA solution, new closed-form expressions are derived for the ergodic secrecy sum rate (ESSR) with Rayleigh fading channel. Furthermore, we explicitly determine the high signal-to-noise ratio slope and power offset of the ESSR to highlight the benefits of friendly jamming. Numerical examples are provided to demonstrate the impact of the FJ's location and number of antennas on the secrecy performance.
In order to solve the security problem in the downlink untrusted UAV multi-relay system, a joint power allocation and relay selection scheme with hardware impairment is proposed. In this scheme, cooperative jamming technology is applied to the untrusted UAV relay system. Firstly, the power allocation coefficient of artificial noise used for cooperative jamming at the source node is optimized, and then the UAV relay selection is carried out under this condition to maximize the system security capacity. According to the model analysis, the secrecy performance of the system is analyzed from the perspective of the ergodic secrecy rate and secrecy outage probability, and the Monte Carlo simulations are carried out to verify the effectiveness of the proposed scheme by comparing with the traditional power allocation and relay selection schemes.