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This paper proposes a novel precoding scheme for multiuser multiple-input–multiple-output (MIMO) relay systems in the presence of imperfect channel state information (CSI). The base station (BS) and the MIMO relay station (RS) are both equipped with the same codebook of unitary matrices. According to each element of the codebook, we create a <bold>latent</bold> precoding matrix pair, namely,...
The performance of adaptive beamforming degrades in presence of signal model mismatches. In particular, when the desired signal is present in training snapshots, the adaptive beamforming is quite sensitive to desired signal steering vector mismatch. Therefore, a robust adaptive beamforming for actual system is proposed based on the reconstruction of interference covariance matrix and mismatched steering...
Adaptive beamformers will degrade severely when the array weights cannot adapt as fast as the environmental changes, especially when unexpected interferences exist. Low sidelobe levels can increase the ability to suppress the white noise and unexpected interferences. The adaptive beamforming with low sidelobe levels is transformed into a weighted pattern synthesis problem. This weighting function...
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