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In these systems, a primary transmitter (PT) will transmit its sensitive medical information to a primary receiver (PR) by a multi-antenna-based secondary transmitter (ST), where we consider that a potential eavesdropper may listen to the PT\u2019s sensitive information. Meanwhile, the ST also transmits its own information concurrently by utilizing spectrum sharing. We aim to propose a novel scheme for jointly designing the optimal parameters, i.e., energy harvesting (EH) time ratio and secure beamforming vectors, for maximizing the primary secrecy transmission rate while guaranteeing secondary transmission requirement. For solving the nonconvex optimization problem, we transfer the problem into convex optimization form by adopting the semidefinite relaxation (SDR) method and Charnes\u2013Cooper transformation technique. Then, the optimal secure beamforming vectors and energy harvesting duration can be obtained easily by utilizing the CVX tools. According to the simulation results of secrecy transmission rate, i.e., secrecy capacity, we can observe that the proposed protocol for the considered system model can effectively promote the primary secrecy transmission rate when compared with traditional zero-forcing (ZF) scheme, while ensuring the transmission rate of the secondary system.<\/jats:p>","DOI":"10.1155\/2020\/7542726","type":"journal-article","created":{"date-parts":[[2020,2,24]],"date-time":"2020-02-24T18:33:59Z","timestamp":1582569239000},"page":"1-10","source":"Crossref","is-referenced-by-count":7,"title":["Secure Information Transmissions in Wireless-Powered Cognitive Radio Networks for Internet of Medical Things"],"prefix":"10.1155","volume":"2020","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6993-5347","authenticated-orcid":true,"given":"Kun","family":"Tang","sequence":"first","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Millimeter-Wave and Terahertz, School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China"},{"name":"School of Electronics and Information Engineering, Hunan University of Science and Engineering, Yongzhou 425000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenjuan","family":"Tang","sequence":"additional","affiliation":[{"name":"College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9881-689X","authenticated-orcid":true,"given":"Entao","family":"Luo","sequence":"additional","affiliation":[{"name":"School of Electronics and Information Engineering, Hunan University of Science and Engineering, Yongzhou 425000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiyuan","family":"Tan","sequence":"additional","affiliation":[{"name":"School of Computing, Edinburgh Napier University, Edinburgh EH11 4BN, 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