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This paper presents a robust linear processing scheme for the downlink of MIMO-relay systems with imperfect channel state information (CSI) aiming to minimize the mean squared error (MSE). The imperfect CSI consists of the channel estimate and the estimation error covariance matrix. The robust linear processing is based on the associated Karush-Kuhn-Tucker conditions. After obtaining the solution...
This paper addresses the filter-design issues for multi-user non-regenerative MIMO-relay systems. Based on the perfect channel state information (CSI), optimal joint linear filter schemes at the base station and the relay are derived, aiming to minimize the mean squared error (MSE). We first propose the joint optimal filter scheme in the downlink scenario along with a more practical suboptimal scheme,...
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