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In this paper, joint transceiver design for dual-hop amplify-and-forward (AF)MIMO relay systems with Gaussian distributed channel estimation errors in bothtwo hops is investigated. Due to the fact that various linear transceiverdesigns can be transformed to a weighted linear minimum mean-square-error(LMMSE) transceiver design with specific weighting matrices, weighted meansquare error (MSE) is chosen as the performance metric. Precoder matrix atsource, forwarding matrix at relay and equalizer matrix at destination arejointly designed with channel estimation errors taken care of by Bayesianphilosophy. Several existing algorithms are found to be special cases of theproposed solution. The performance advantage of the proposed robust design isdemonstrated by the simulation results.

Joint Robust Weighted LMMSE Transceiver Design for Dual-Hop AF Multiple-Antenna Relay Systems