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In this paper, we consider the achievable sum secrecy rate in MISO(multiple-input-single-output) {\em full-duplex} wiretap channel in thepresence of a passive eavesdropper and imperfect channel state information(CSI). We assume that the users participating in full-duplex communication havemultiple transmit antennas, and that the users and the eavesdropper have singlereceive antenna each. The users have individual transmit power constraints.They also transmit jamming signals to improve the secrecy rates. We obtain theachievable perfect secrecy rate region by maximizing the worst case sum secrecyrate. We also obtain the corresponding transmit covariance matrices associatedwith the message signals and the jamming signals. Numerical results that showthe impact of imperfect CSI on the achievable secrecy rate region arepresented.

Sum Secrecy Rate in MISO Full-Duplex Wiretap Channel with Imperfect CSI