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Open AccessFeature PaperArticle

A Cooperative Jamming Technique to Protect a Two-User Broadcast Channel with Confidential Messages and an External Eavesdropper

1
Department of Electronics Telecommunications and Informatics, Universidade de Aveiro, 3810-193 Aveiro, Portugal
2
Instituto de Telecomunicações, 3810-193 Aveiro, Portugal
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(3), 496; https://doi.org/10.3390/electronics9030496
Received: 28 February 2020 / Revised: 15 March 2020 / Accepted: 16 March 2020 / Published: 18 March 2020
(This article belongs to the Special Issue Cooperative Communications for Future Wireless Systems)
This work addresses the security of a two-user broadcast channel. The challenge of protecting a broadcast channel is associated with the necessity of securing the system, not only against eavesdropping attacks originating from external nodes, but also to ensure that the inside users do not eavesdrop on each other’s information. To address this issue, the present work proposes a cooperative jamming scheme that provides protection against eavesdropping attacks carried out simultaneously by inside users and external eavesdroppers. To achieve this goal, the developed scheme combines real interference alignment with a blind cooperative jamming technique defined in the literature. An information theoretical analysis shows that positive secure degrees of freedom are achievable using the proposed solution. View Full-Text
Keywords: broadcast channel; physical layer security; cooperative jamming; real interference alignment; blind cooperative jamming broadcast channel; physical layer security; cooperative jamming; real interference alignment; blind cooperative jamming
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MDPI and ACS Style

Anjos, G.; Castanheira, D.; Silva, A.; Gameiro, A. A Cooperative Jamming Technique to Protect a Two-User Broadcast Channel with Confidential Messages and an External Eavesdropper. Electronics 2020, 9, 496.

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