Securing Two-Way Cooperative Systems With an Untrusted Relay: A Constellation-Rotation Aided Approach

@article{Xu2015SecuringTC,
  title={Securing Two-Way Cooperative Systems With an Untrusted Relay: A Constellation-Rotation Aided Approach},
  author={Hongbin Xu and Li Sun and Pinyi Ren and Qinghe Du},
  journal={IEEE Communications Letters},
  year={2015},
  volume={19},
  pages={2270-2273}
}
This letter studies the secure transmission protocol design for two-way cooperative systems, where two terminal users communicate via an untrusted relay. The relay acts as both a helper and a potential eavesdropper, from which the users' messages need to be kept secret. A constellation-rotation aided approach is proposed to prevent the relay from decoding these messages. By rotating the signal constellation with a proper angle, the complex-valued symbol can be fully represented by its real… CONTINUE READING
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