Relay Precoder Designs for Amplify-and-Forward MIMO Relay Networks With Imperfect Channel State Information
This paper addresses relay pre-coder designs for amplify-and-forward MIMO relay networks with imperfect Channel State Information (CSI). The authors first derive the capacity of a MIMO relay network with imperfect CSI. Two relay precoding schemes are then proposed - Scheme I maximizes the upper bound of the capacity obtained by applying Jensen's equality, whilst scheme II simply ignores the error of CSI of the channel from the relay to the destination. Numerical results show that, the capacity increases with the correlation coefficients between the CSI known to the estimating nodes and the CSI known to other nodes. Furthermore, the correlation coefficient of the channel from the source to the relay has more impact on the capacity than the channel from the relay to the destination.