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Since there exists no direct link between source and user because of the shadowing effect, a positive system secrecy rate cannot be obtained. Addressing this issue, a cooperative user\u2010aided jamming technique to improve the secrecy performance is employed. With the aim of maximising the system secrecy rate, a joint resource allocation problem of power allocation, relay assignment and subcarrier pairing is formulated. By using the signal\u2010to\u2010noise ratio based approach and the Lagrange dual method, this nonconvex problem is solved efficiently. To reduce the calculation complexity, a suboptimal algorithm, which decouples the power allocation with the relay assignment and subcarrier pairing is further proposed. Numerical results are presented to demonstrate the advantage of the two proposed algorithms and the impact of relays' location and number of subcarriers on the secrecy performance. Moreover, it is shown that the secrecy performance of the proposed scheme is decreased with respect to the number of untrusted\u00a0relays.<\/jats:p>","DOI":"10.1049\/cmu2.12391","type":"journal-article","created":{"date-parts":[[2022,4,19]],"date-time":"2022-04-19T07:40:21Z","timestamp":1650354021000},"page":"929-941","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Subcarrier\u2010pair based joint resource allocation for secure cooperative OFDM system with multiple untrusted AF relays"],"prefix":"10.1049","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2343-7139","authenticated-orcid":false,"given":"Yifeng","family":"Jin","sequence":"first","affiliation":[{"name":"School of Electronics Peking University Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xunan","family":"Li","sequence":"additional","affiliation":[{"name":"National Computer Network Emergency Response Technical Team Coordination Center of China Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guocheng","family":"Lv","sequence":"additional","affiliation":[{"name":"School of Electronics Peking University Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meihui","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Electronics Peking University Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ye","family":"Jin","sequence":"additional","affiliation":[{"name":"School of Electronics Peking University Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"265","published-online":{"date-parts":[[2022,4,19]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2020.2973618"},{"issue":"02","key":"e_1_2_9_3_1","first-page":"104","article-title":"Physical layer security for massive access in cellular internet of things","volume":"3","author":"Qiao Q.","year":"2020","journal-title":"Sci. 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