Secrecy Performance of NOMA-Based Two-Way Communication System at Physical Layer

Secrecy Performance of NOMA-Based Two-Way Communication System at Physical Layer | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Secrecy Performance of NOMA-Based Two-Way Communication System at Physical Layer Shashibhushan Sharma, Kounteya Sarkar, Sudip Misra This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8541192/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 7 You are reading this latest preprint version Abstract This paper examines physical layer security in a NOMA-based two-way wireless communication system with several decode-and-forward relays and a malicious eavesdropper. We implement a partial relay selection system to maximize the secrecy capacity of a specific user's information signal. Two hops are involved in the communication process because of the half-duplex relay cooperation. A selected relay receives information from two users. The relay strengthens the signals and broadcasts them during the second hop. Additionally, a jammer transmits a jamming signal that is known to all legitimate nodes but appears as noise with the received signals at the eavesdropper. Since legitimate user nodes are already aware of the jamming signal, channel status information, and self-information, they can decode the original information in downlink mode by self-interference and successive interference cancellation. Secrecy outage probability, intercept probability, and secrecy throughput have been investigated as metrics to analyze the security, where the secrecy performance of a particular user is found to increase by $94.66, %$ with an increment in transmit SNR of jamming from $60, dB$ to $70, dB$ and increases by $90.78, %$ with an increment in the number of relays from 2 to 5. Physical layer security Two-way communication Selection combining Secrecy throughput Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Reviews received at journal 27 Apr, 2026 Reviewers agreed at journal 06 Apr, 2026 Reviewers agreed at journal 04 Apr, 2026 Reviewers invited by journal 30 Mar, 2026 Editor assigned by journal 25 Feb, 2026 Submission checks completed at journal 26 Jan, 2026 First submitted to journal 07 Jan, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8541192","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":615171310,"identity":"5d1504ca-2d1c-4a52-a8e2-e692c70cc8ba","order_by":0,"name":"Shashibhushan Sharma","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA7klEQVRIiWNgGAWjYDACCQaGAx8qbIA08wEQV4YYLYwHZ5xJA9JsCSAuDzFamA/zth0G0jwGID5hLfKz2x8c5jmTlifZf+bzqxs1FjwM7IePbsCnxeDOGYODcypsiqUlcrdZ5xwDOownLe0GXi0SOQwH3pxJS5wnwbvNOIcNqEWCxwyvFvkZ6Q8OAP2SOI//zDPjnH9EaGG4kWBwEKRlNkMO8+PcNiK0gP0CDORiyRlpZsy5fRI8bIT8Agyxxx+AUZkncf7w48853+rk+NkPH8PvMChIAGI2CRCLjRjlMC3MH4hVPQpGwSgYBSMLAAAZOU+i9i0KWwAAAABJRU5ErkJggg==","orcid":"","institution":"University of Allahabad","correspondingAuthor":true,"prefix":"","firstName":"Shashibhushan","middleName":"","lastName":"Sharma","suffix":""},{"id":615171311,"identity":"8b402142-faa0-4406-a2f8-e32894ed9c60","order_by":1,"name":"Kounteya Sarkar","email":"","orcid":"","institution":"IIT Kharagpur","correspondingAuthor":false,"prefix":"","firstName":"Kounteya","middleName":"","lastName":"Sarkar","suffix":""},{"id":615171312,"identity":"cea8cca8-f512-48e7-a4e3-2b1e6e1ef464","order_by":2,"name":"Sudip Misra","email":"","orcid":"","institution":"IIT Kharagpur","correspondingAuthor":false,"prefix":"","firstName":"Sudip","middleName":"","lastName":"Misra","suffix":""}],"badges":[],"createdAt":"2026-01-07 12:08:32","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-8541192/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8541192/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":105904955,"identity":"9ec0be80-8b8f-45ce-b575-fa4eb31c21ce","added_by":"auto","created_at":"2026-04-01 10:11:11","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":521283,"visible":true,"origin":"","legend":"","description":"","filename":"WPCNPDF.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8541192/v1_covered_d4127901-ad4a-4e6c-a52c-12fed7480ed9.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Secrecy Performance of NOMA-Based Two-Way Communication System at Physical Layer","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"wireless-personal-communications","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"wire","sideBox":"Learn more about [Wireless Personal Communications](https://www.springer.com/journal/11277)","snPcode":"11277","submissionUrl":"https://submission.nature.com/new-submission/11277/3","title":"Wireless Personal Communications","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Physical layer security, Two-way communication, Selection combining, Secrecy throughput","lastPublishedDoi":"10.21203/rs.3.rs-8541192/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8541192/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"This paper examines physical layer security in a NOMA-based two-way wireless communication system with several decode-and-forward relays and a malicious eavesdropper. We implement a partial relay selection system to maximize the secrecy capacity of a specific user's information signal. Two hops are involved in the communication process because of the half-duplex relay cooperation. A selected relay receives information from two users. The relay strengthens the signals and broadcasts them during the second hop. Additionally, a jammer transmits a jamming signal that is known to all legitimate nodes but appears as noise with the received signals at the eavesdropper. Since legitimate user nodes are already aware of the jamming signal, channel status information, and self-information, they can decode the original information in downlink mode by self-interference and successive interference cancellation. 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