Optimal Position and Target Rate for Covert Communication in UAV-Assisted Uplink RSMA Systems
Abstract
:1. Introduction
- We investigate a novel application of RSMA systems, where a UAV splits its rate to avoid deteriorating the covert transmission of a ground user while increasing the ESR. To the best of the authors’ knowledge, this is the first work that studied the covet communication in UAV-assisted uplink RSMA system.
- We derive the closed-form expressions of the ESR and obtain the optimal target rate of UAV which maximizes the ESR of the system. Subjected to minimum detection error probability (DEP) and expected covert rate (ECR) constraints, a joint position and target rate optimization problem is formulated for maximizing the ESR of uplink RSMA systems.
- The numerical results show that the proposed scheme outperforms NOMA systems in terms of ESR with the same DEP and ECR and illustrate the effect of constraints on the ESR.
2. System Model
2.1. Communication Scenario
2.2. Proposed Transmission Scheme
2.3. Detection Metrics at Willie
3. Performance Analysis
3.1. Covertness Analysis
3.2. Sum Rate Analysis
- (1)
- UnderThe achievable rate under of is given byThus, the outage probability of under is expressed as
- (2)
- UnderSimilarly, the achievable rate under of is given byAnd the outage probability of under is expressed asSince fixed power is allocated to to satisfy , . The ESR under is given byFinally, the ESR of the system is expressed as
4. Optimization Problem
5. Numerical Results
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
PLS | Physical layer security |
AWGN | Additive white Gaussian noise |
UAV | Unmanned aerial vehicle |
RSMA | Rate-splitting multiple access |
NOMA | Non-orthogonal multiple access |
RS | Rate-splitting |
BS | Base station |
ESR | Expected sum rate |
DEP | Detection error probability |
3D | Three-dimensional |
CSI | Channel state information |
LOS | Line-of-sight |
SINR | Signal-to-interference-plus-noise ratio |
LRT | Likelihood ratio test |
FAP | False alarm probability |
MDP | Miss detection probability |
KKT | Karush–Kuhn–Tucker |
Appendix A. Proof of Lemma 1
Appendix B. Proof of Lemma 2
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Duan, Z.; Yang, X.; Zhang, T.; Wang, L. Optimal Position and Target Rate for Covert Communication in UAV-Assisted Uplink RSMA Systems. Drones 2023, 7, 237. https://doi.org/10.3390/drones7040237
Duan Z, Yang X, Zhang T, Wang L. Optimal Position and Target Rate for Covert Communication in UAV-Assisted Uplink RSMA Systems. Drones. 2023; 7(4):237. https://doi.org/10.3390/drones7040237
Chicago/Turabian StyleDuan, Zhengxiang, Xin Yang, Tao Zhang, and Ling Wang. 2023. "Optimal Position and Target Rate for Covert Communication in UAV-Assisted Uplink RSMA Systems" Drones 7, no. 4: 237. https://doi.org/10.3390/drones7040237
APA StyleDuan, Z., Yang, X., Zhang, T., & Wang, L. (2023). Optimal Position and Target Rate for Covert Communication in UAV-Assisted Uplink RSMA Systems. Drones, 7(4), 237. https://doi.org/10.3390/drones7040237