{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T06:05:33Z","timestamp":1769839533610,"version":"3.49.0"},"reference-count":29,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2022,9,9]],"date-time":"2022-09-09T00:00:00Z","timestamp":1662681600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["62271399"],"award-info":[{"award-number":["62271399"]}]},{"name":"National Natural Science Foundation of China","award":["61901379"],"award-info":[{"award-number":["61901379"]}]},{"name":"National Natural Science Foundation of China","award":["2022KW-07"],"award-info":[{"award-number":["2022KW-07"]}]},{"name":"National Natural Science Foundation of China","award":["2020YFB1807003"],"award-info":[{"award-number":["2020YFB1807003"]}]},{"name":"National Natural Science Foundation of China","award":["JCYJ20190806160218174"],"award-info":[{"award-number":["JCYJ20190806160218174"]}]},{"name":"Key Research and Development Program of Shaanxi Province","award":["62271399"],"award-info":[{"award-number":["62271399"]}]},{"name":"Key Research and Development Program of Shaanxi Province","award":["61901379"],"award-info":[{"award-number":["61901379"]}]},{"name":"Key Research and Development Program of Shaanxi Province","award":["2022KW-07"],"award-info":[{"award-number":["2022KW-07"]}]},{"name":"Key Research and Development Program of Shaanxi Province","award":["2020YFB1807003"],"award-info":[{"award-number":["2020YFB1807003"]}]},{"name":"Key Research and Development Program of Shaanxi Province","award":["JCYJ20190806160218174"],"award-info":[{"award-number":["JCYJ20190806160218174"]}]},{"name":"National Key Research and Development Program of China","award":["62271399"],"award-info":[{"award-number":["62271399"]}]},{"name":"National Key Research and Development Program of China","award":["61901379"],"award-info":[{"award-number":["61901379"]}]},{"name":"National Key Research and Development Program of China","award":["2022KW-07"],"award-info":[{"award-number":["2022KW-07"]}]},{"name":"National Key Research and Development Program of China","award":["2020YFB1807003"],"award-info":[{"award-number":["2020YFB1807003"]}]},{"name":"National Key Research and Development Program of China","award":["JCYJ20190806160218174"],"award-info":[{"award-number":["JCYJ20190806160218174"]}]},{"name":"Foundation of the Science, Technology, and Innovation Commission of Shenzhen Municipality","award":["62271399"],"award-info":[{"award-number":["62271399"]}]},{"name":"Foundation of the Science, Technology, and Innovation Commission of Shenzhen Municipality","award":["61901379"],"award-info":[{"award-number":["61901379"]}]},{"name":"Foundation of the Science, Technology, and Innovation Commission of Shenzhen Municipality","award":["2022KW-07"],"award-info":[{"award-number":["2022KW-07"]}]},{"name":"Foundation of the Science, Technology, and Innovation Commission of Shenzhen Municipality","award":["2020YFB1807003"],"award-info":[{"award-number":["2020YFB1807003"]}]},{"name":"Foundation of the Science, Technology, and Innovation Commission of Shenzhen Municipality","award":["JCYJ20190806160218174"],"award-info":[{"award-number":["JCYJ20190806160218174"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In this paper, we propose a high-altitude platform (HAP) and unmanned aerial vehicles (UAVs) collaboration framework in non-orthogonal multiple access (NOMA)-enabled Internet of Things (IoT) networks with the presence of an eavesdropping UAV. For the considered framework, we investigate the uplink secure transmission by optimizing channel allocation from UAVs to HAP, users\u2019 power, and UAVs\u2019 three-dimensional (3D) position. To solve this non-convex problem, we adopt the K-means cluster pair algorithm to divide paired users into different groups and each cluster can be served by a corresponding UAV. Then, the formulated optimization problem is decoupled into three subproblems and tackled iteratively based on the block coordinate descent (BCD) algorithm. Finally, simulation results verify that the proposed network architecture can achieve a higher secure rate, faster convergence evolution, and lower complexity in comparison with the current works.<\/jats:p>","DOI":"10.3390\/rs14184501","type":"journal-article","created":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T04:05:41Z","timestamp":1663041941000},"page":"4501","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["An HAP and UAVs Collaboration Framework for Uplink Secure Rate Maximization in NOMA-Enabled IoT Networks"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9981-3623","authenticated-orcid":false,"given":"Dawei","family":"Wang","sequence":"first","affiliation":[{"name":"Research & Development Institute, Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China"},{"name":"School of Electronics and Information, Northwestern Polytechnical University, Xi\u2019an 710072, China"},{"name":"Dongguan Sanhang Innovation Institute, Dongguan 523808, China"}]},{"given":"Menghan","family":"Wu","sequence":"additional","affiliation":[{"name":"Research & Development Institute, Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China"},{"name":"School of Electronics and Information, Northwestern Polytechnical University, Xi\u2019an 710072, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8758-3776","authenticated-orcid":false,"given":"Yixin","family":"He","sequence":"additional","affiliation":[{"name":"Research & Development Institute, Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China"},{"name":"School of Electronics and Information, Northwestern Polytechnical University, Xi\u2019an 710072, China"}]},{"given":"Linna","family":"Pang","sequence":"additional","affiliation":[{"name":"Beijing Research Institute of Telemetry, Beijing 100094, China"}]},{"given":"Qian","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Electronics and Information, Northwestern Polytechnical University, Xi\u2019an 710072, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0030-6758","authenticated-orcid":false,"given":"Ruonan","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Electronics and Information, Northwestern Polytechnical University, Xi\u2019an 710072, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Korala, H., Georgakopoulos, D., Jayaraman, P.P., and Yavari, A. 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