This paper presents new results on linear transceiver designs in a multiple-input-multiple-output (MIMO) link. By considering the minimal total mean-square error (MSE) criterion, we prove that the robust optimal linear transceiver design has a channel-diagonalizing structure, which verifies the conjecture in the previous work \cite{JW_2011}. Based on this property, the original design problem can be transformed into a scalar problem, whose global optimal solution is first obtained in this work. Simulation results show the performance advantages of our solution over the existing schemes.
@article{arxiv.2003.01585,
title = {Achieving Optimality in Robust Joint Optimization of Linear Transceiver Design},
author = {Hongying Tang and Wen Chen and Jun Li},
journal= {arXiv preprint arXiv:2003.01585},
year = {2020}
}