Secure Beamforming for MIMO Two-Way Communications With an Untrusted Relay

  title={Secure Beamforming for MIMO Two-Way Communications With an Untrusted Relay},
  author={Jianhua Mo and Meixia Tao and Yuan Liu and Rui Wang},
  journal={IEEE Transactions on Signal Processing},
This paper studies the secure beamforming design in a multiple-antenna three-node system where two source nodes exchange messages with the help of an untrusted relay node. The relay acts as both an essential signal forwarder and a potential eavesdropper. Both two-phase and three-phase two-way relay strategies are considered. Our goal is to jointly optimize the source and relay beamformers for maximizing the secrecy sum rate of the two-way communications. We first derive the optimal relay… CONTINUE READING
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