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In this paper, we consider decode-and-forward (DF) relay beamforming withimperfect channel state information (CSI), cooperative artificial noise (AN)injection, and finite-alphabet input in the presence of an user and $J$non-colluding eavesdroppers. The communication between the source and the useris aided by a multiple-input-multiple-output (MIMO) DF relay. We use the factthat a wiretap code consists of two parts: i) common message (non-secret), andii) secret message. The source transmits two independent messages: i) commonmessage (non-secret), and ii) secret message. The common message is transmittedat a fixed rate $R_{0}$, and it is intended for the user. The secret message isalso intended for the user but it should be kept secret from the $J$eavesdroppers. The source and the MIMO DF relay operate under individual powerconstraints. In order to improve the secrecy rate, the MIMO relay also injectsartificial noise. The CSI on all the links are assumed to be imperfect and CSIerrors are assumed to be norm bounded. In order to maximize the worst casesecrecy rate, we maximize the worst case link information rate to the usersubject to: i) the individual power constraints on the source and the MIMOrelay, and ii) the best case link information rates to $J$ eavesdroppers beless than or equal to $R_{0}$ in order to support a fixed common message rate$R_{0}$. Numerical results showing the effect of perfect/imperfect CSI,presence/absence of AN with finite-alphabet input on the secrecy rate arepresented.

MIMO DF Relay Beamforming for Secrecy with Artificial Noise, Imperfect CSI, and Finite-Alphabet