Improving the Secrecy Rate via Combining the Artificial Noise with the Masked Beamforming Scheme

This paper considers the secure communication via combining the artificial noise with the masked beamforming scheme. In this scenario, the transmitter is equipped with multi-antenna while each of the eavesdroppers is equipped with only one antenna, and the legitimate receiver has a receiving antenna and a transmitting antenna, respectively. The transmitter simultaneously transmits a beamformed secret information-bearing signal to a legitimate receiver and artificial noise (AN) to the eavesdroppers. The legitimate receiver sends the AN to confuse the eavesdropper while receiving the desired signal from the transmitter. We compare the proposed scheme that combining the AN with masked beamforming with no beamforming vector scheme, and derive that the combined strategy obviously improved the secrecy rate.