## 3 Secure Rate Maximization Scheme
### K-Means Cluster Pair Algorithm
In Proceedings of the 2020 IEEE 92 nd Vehicular Technology Conference (VTC2020-Fall), Victoria, BC, Canada, 18 November-16 December 2020; pp. 1-5. [CrossRef]
* (8) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Cooperative Hybrid Nonorthogonal Multiple Access-Based Mobile-Edge Computing in Cognitive Radio Networks. _IEEE Trans. Cogn. Commun. Netw._**2022**, \(8\), 1104-1117. * (9) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] NOMA-based UAV-aided networks for emergency communications. _China Commun._**2020**, _11_, 54-66. [CrossRef]
* (10) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Multiple unmanned-aerial-vehicles deployment and user pairing for nonorthogonal multiple access schemes. _IEEE Internet Things J._**2021**, \(6\), 1883-1895. * (11) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] An uplink throughput optimization scheme for UAV-enabled urban emergency communications. _IEEE Internet Things J._**2022**, \(9\), 4291-4302. [CrossRef]
* (12) [PERSON]; [PERSON]; [PERSON]; [PERSON] Energy-efficient joint user-RB association and power allocation for uplink hybrid NOMA-OMA. _IEEE Internet Things J._**2019**, \(6\), 5119-5131. [CrossRef]
* (13) [PERSON]; [PERSON]; [PERSON] Performance analysis of uplink NOMA-relevant strategy under statistical delay QoS constraints. _IEEE Wirel. Commun. Lett._**2020**, \(9\), 1323-1326. [CrossRef]
* (14) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] A NOMA-Enabled Framework for Relay Deployment and Network Optimization in Double-Layer Airborne Access VANETs. _IEEE Trans. Intell. Transp. Syst._**2022**. [CrossRef]
* (15) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Airborne communication networks: A survey. _J. Sel. Areas Commun._**2018**, _36_, 1907-1926. [CrossRef]
* (16) [PERSON]; [PERSON]; [PERSON]; [PERSON] HAPS-based relaying for integrated space-air-ground networks with hybrid FSO/RF communication: A performance analysis. _Trans. Aerosp. Electron. Syst._**2021**, _57_, 1581-1599. [CrossRef]
* (17) [PERSON]; [PERSON]; [PERSON] Heterogeneous statistical QoS provisioning over airborne mobile wireless networks. _IEEE J. Sel. Areas Commun._**2018**, _36_, 2139-2152. * (18) [PERSON]; [PERSON]; [PERSON]; [PERSON] Content caching in HAP-assisted multi-UAV networks using hierarchical federated learning. _J. Phys. Conf. Ser._**2021**, 1160-1162. [CrossRef]
* (19) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Time Domain Multiplexed LoRa Modulation Waveform Design for IoT Communication. _IEEE Commun. Lett._**2022**, _26_, 838-842. * (20) [PERSON]; [PERSON]; [PERSON]; [PERSON] Fundamentals of Physical Layer Anonymous Communications: Sender Detection and Anonymous Precoding. _IEEE Trans. Wirel. Commun._**2022**, _21_, 64-79. [CrossRef]
* (21) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Path loss measurement and modeling for low-altitude UAV access channels. In Proceedings of the 2017 IEEE 86 th Vehicular Technology Conference (VTC-Fall), Toronto, ON, Canada, 24-27 September 2017; pp. 1-5. [CrossRef]
* (22)_TR 38.901 V14.0.0;_ 3 GPP Technical Specification Group Radio Access Networks; Study on Channel Model for Frequencies from 0.5 to 100 GHz (Release14); Technical Report. ETSI: Sophia Antipolis, France, 2017. Available online: [[https://www.etsi.org/deliver/etsi_tr/138900_138999/138901/14.00.00_60/tr_138901v140000p.pdf](https://www.etsi.org/deliver/etsi_tr/138900_138999/138901/14.00.00_60/tr_138901v140000p.pdf)]([https://www.etsi.org/deliver/etsi_tr/138900_138999/138901/14.00.00_60/tr_138901v140000p.pdf](https://www.etsi.org/deliver/etsi_tr/138900_138999/138901/14.00.00_60/tr_138901v140000p.pdf)) (accessed on 5 May 2017). * (23) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Outage-Driven Link Selection for Secure Buffer-Aided Networks. _Sci. China Inf. Sci._**2022**, _65_, 1-16. * (24) [PERSON]; [PERSON] A General 3D Space-Time-Frequency Non-Stationary Model for 6G Channels. _IEEE Trans. Wirel. Commun._**2021**, _20_, 535-548.