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Channel estimation in the presence of pilot contamination-induced inter-cell interference (ICI) is a major challenge in large-scale multiple-input multiple-output (LS-MIMO) systems. In this paper, a subspace-based semi-blind channel estimator (SBCE) relying on an optimum pilot design (in the sense of minimizing the channel estimation error covariance) is proposed for LS-MIMO systems. The proposed...
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