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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Cooperative Decode-and-Forward Relaying for Secure Multicasting

  • Lee, Jong-Ho (Department of Electronic Engineering, Gachon University) ;
  • Sohn, Illsoo (Department of Electronic Engineering, Gachon University) ;
  • Song, Sungju (Department of Electronic Engineering, Myongji University) ;
  • Kim, Yong-Hwa (Department of Electronic Engineering, Myongji University)
  • Received : 2015.12.01
  • Accepted : 2016.05.16
  • Published : 2016.10.01
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Abstract

In this paper, secure multicasting with the help of cooperative decode-and-forward relays is considered for the case in which a source securely sends a common message to multiple destinations in the presence of a single eavesdropper. We show that the secrecy rate maximization problem in the secure multicasting scenario under an overall power constraint can be solved using semidefinite programing with semidefinite relaxation and a bisection technique. Further, a suboptimal approach using zero-forcing beamforming and linear programming based power allocation is also proposed. Numerical results illustrate the secrecy rates achieved by the proposed schemes under secure multicasting scenarios.

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