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In this paper, we investigate the secure relay beamforming problems for the amplify-and-forward (AF) relay network, where the transmitter sends the information to the receiver with the help of a multiple-antenna relay in the presence of an eavesdropper. We first study the secrecy rate maximization (SRM) problem in the case of complete channel state information (CSI). The rank-1 relay beamformer, which...
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