Optimal Position and Target Rate for Covert Communication in UAV-Assisted Uplink RSMA Systems

Abstract

With the explosive increase in demand for wireless communication, the issue of wireless communication security has also become a growing concern. In this paper, we investigate a novel covert communication for unmanned aerial vehicle (UAV)-assisted uplink rate-splitting multiple access (RSMA) systems, where a UAV adopts the rate-splitting (RS) strategy to increase the total transmission rate while avoiding deteriorating the covert transmission of a ground user. In the proposed system, a ground user and a UAV adopt the RSMA scheme to simultaneously communicate with a base station surveilled by an evil monitor. The UAV acts as both the transmitter and the friendly jammer to cover the ground user’s transmission with random power. To maximize the expected sum rate (ESR), we first study the RS strategy and obtain the optimal power allocation factor. Then, the closed-form of minimum detection error probability (DEP), ESR, and optimal target rate of the UAV are derived. Constrained by the minimum DEP and expected covert rate (ECR), we maximize the ESR by optimizing the position and target rate of the UAV. Numerical results show that the proposed scheme outperforms the traditional NOMA systems in terms of ESR with the same DEP and ECR.

Security Performance Analysis of Full-Duplex UAV Assisted Relay System Based on SWIPT Technology

“…It is also possible to combine multiple uses of UAVs in the design of communication systems. For example, in the literature [11], the UAV acts as both a jammer and a transmitter, sending signals to the base station while sending jamming to the eavesdropper, maximizing the Expected Sum Rate (ESR) by optimizing the position and target rate of the UAV. This paper proposes a secure transmission model for a UAV full-duplex relay communication system based on an aerial eavesdropping scenario, which is shown in Figure 1, where all the nodes are fixed points and the source node is set as A, the destination node is set as B, the UAV trustworthy relay node is set as U, and the UAV eavesdropping node is set as E. Passive eavesdropping is adopted.…”