Secure Relaying Communication with Multi-Antenna Full-Duplex Destination

In this paper, the physical layer security of a full-duplex secure cooperative wireless system with multiple inputmultiple-output (MIMO) destination node is examined. We assume that a source node communicates  with  a destination node in the presence of an eavesdropper. In addition, a jamming signal is sent via destination to weaken the relay-eavesdropper thanks due to the full-duplex operation at the destination node. We propose different beamforming schemes and accordingly derive the instantaneous and average secrecy rates. We also study the effect of the number of antennas, the position of the eavesdropper, and the transmit power of the source and destination nodes on the average secrecy rate. Our results reveal that beamforming and friendly jamming increase the secrecy of cooperative communication. Moreover, simulation results demonstrate that the choice of the beamforming scheme plays a critical role in determining the FD cooperative communication gains.