{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T14:22:26Z","timestamp":1753885346990,"version":"3.41.2"},"reference-count":23,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2021,4,7]],"date-time":"2021-04-07T00:00:00Z","timestamp":1617753600000},"content-version":"vor","delay-in-days":96,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"publisher","award":["ZYGX2016KYQD143"],"award-info":[{"award-number":["ZYGX2016KYQD143"]}],"id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["62001094"],"award-info":[{"award-number":["62001094"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Wireless Communications and Mobile Computing"],"published-print":{"date-parts":[[2021,1]]},"abstract":"<jats:p>In this paper, we consider a novel <jats:italic>Internet of Things<\/jats:italic> (IoT) system in smart city called <jats:italic>unmanned aerial vehicle<\/jats:italic>\u2010 (UAV\u2010) assisted cognitive backscatter network, where a UAV is employed as both a relay and a radio frequency source to help the data transmission between ground IoT <jats:italic>backscatter devices<\/jats:italic> (BDs) and a remote <jats:italic>data center<\/jats:italic> (DC). However, since the IoT applications are usually not assigned dedicated spectrum resource in smart cities, these data transmissions from BDs to the DC should share the licensed spectrum of <jats:italic>cellular users<\/jats:italic> (CUs). Therefore, we aim to maximize the minimum uplink throughput among all BDs while avoiding severe interference to CUs via joint spectrum management and UAV trajectory design. To solve the problem, we propose an iterative method utilizing block coordinated decent to partition the variables into two blocks. For the spectrum management problem, we first prove its convexity with the transmit power and time scheduling and then propose a two\u2010step method to solve the two variables sequentially. For the UAV trajectory design problem, we resort to the fractional programming method to handle it. Simulation results demonstrate that the proposed algorithm can significantly increase the average max\u2010min rate of the BDs while guaranteeing the acceptable interference to CUs with a fast convergence speed.<\/jats:p>","DOI":"10.1155\/2021\/5536726","type":"journal-article","created":{"date-parts":[[2021,4,7]],"date-time":"2021-04-07T23:31:44Z","timestamp":1617838304000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Intelligent Spectrum Management and Trajectory Design for UAV\u2010Assisted Cognitive Ambient Backscatter Networks"],"prefix":"10.1155","volume":"2021","author":[{"given":"Jiazhou","family":"Liu","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9044-274X","authenticated-orcid":false,"given":"Sa","family":"Xiao","sequence":"additional","affiliation":[]},{"given":"Huayan","family":"Guo","sequence":"additional","affiliation":[]},{"given":"Xiangwei","family":"Zhou","sequence":"additional","affiliation":[]},{"given":"Shixin","family":"He","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2021,4,7]]},"reference":[{"key":"e_1_2_10_1_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.future.2013.01.010"},{"key":"e_1_2_10_2_2","doi-asserted-by":"publisher","DOI":"10.1109\/TII.2019.2947435"},{"key":"e_1_2_10_3_2","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2017.1600404"},{"key":"e_1_2_10_4_2","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2018.1800259"},{"key":"e_1_2_10_5_2","doi-asserted-by":"publisher","DOI":"10.1109\/TII.2019.2951728"},{"key":"e_1_2_10_6_2","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2018.2863267"},{"key":"e_1_2_10_7_2","doi-asserted-by":"crossref","unstructured":"KelloggB. 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Wi-Fi backscatter: Internet connectivity for RF-powered devices 44 Proceedings of the 2014 ACM Conference on SIGCOMM 2014 no. 4 607\u2013618.","DOI":"10.1145\/2740070.2626319"},{"key":"e_1_2_10_8_2","doi-asserted-by":"publisher","DOI":"10.1145\/2740070.2626312"},{"key":"e_1_2_10_9_2","doi-asserted-by":"publisher","DOI":"10.1145\/2534169.2486015"},{"key":"e_1_2_10_10_2","doi-asserted-by":"publisher","DOI":"10.1109\/COMST.2018.2841964"},{"key":"e_1_2_10_11_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2019.2912203"},{"key":"e_1_2_10_12_2","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2018.2856633"},{"key":"e_1_2_10_13_2","doi-asserted-by":"publisher","DOI":"10.1109\/TII.2020.3043734"},{"key":"e_1_2_10_14_2","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.2016.7470933"},{"key":"e_1_2_10_15_2","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2018.1800221"},{"key":"e_1_2_10_16_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2017.2688328"},{"key":"e_1_2_10_17_2","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2017.2763135"},{"key":"e_1_2_10_18_2","doi-asserted-by":"crossref","unstructured":"MaY. 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Drone relays for battery-free networks Proceedings of the Conference of the ACM Special Interest Group on Data Communication 2017 335\u2013347.","DOI":"10.1145\/3098822.3098847"},{"key":"e_1_2_10_19_2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1017501703105"},{"key":"e_1_2_10_20_2","doi-asserted-by":"publisher","DOI":"10.1109\/TSP.2018.2812733"},{"key":"e_1_2_10_21_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2017.2789293"},{"volume-title":"Introduction to Linear Optimization","year":"1997","author":"Bertsimas D.","key":"e_1_2_10_22_2"},{"key":"e_1_2_10_23_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2013.111313.130645"}],"container-title":["Wireless Communications and Mobile Computing"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/downloads.hindawi.com\/journals\/wcmc\/2021\/5536726.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/wcmc\/2021\/5536726.xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1155\/2021\/5536726","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,8,7]],"date-time":"2024-08-07T14:07:42Z","timestamp":1723039662000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1155\/2021\/5536726"}},"subtitle":[],"editor":[{"given":"Xin","family":"Liu","sequence":"additional","affiliation":[]}],"short-title":[],"issued":{"date-parts":[[2021,1]]},"references-count":23,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2021,1]]}},"alternative-id":["10.1155\/2021\/5536726"],"URL":"https:\/\/doi.org\/10.1155\/2021\/5536726","archive":["Portico"],"relation":{},"ISSN":["1530-8669","1530-8677"],"issn-type":[{"type":"print","value":"1530-8669"},{"type":"electronic","value":"1530-8677"}],"subject":[],"published":{"date-parts":[[2021,1]]},"assertion":[{"value":"2021-02-22","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2021-03-11","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2021-04-07","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"5536726"}}