Joint Optimization of the Transmit Covariance and Relay Precoder in General Gaussian Amplify-and-Forward Relay Channels. Gohary, R. H. & Yanikomeroglu, H. IEEE Trans. Inf. Theory, 59(9):5331-5351, 2013.
Joint Optimization of the Transmit Covariance and Relay Precoder in General Gaussian Amplify-and-Forward Relay Channels. [link]Link  Joint Optimization of the Transmit Covariance and Relay Precoder in General Gaussian Amplify-and-Forward Relay Channels. [link]Paper  bibtex   

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