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In this paper, we propose two subspace-projection-based precoding schemes, namely, fullprojection (FP)-and partial-projection (PP)-based precoding, for a cognitive radio multipleinput multiple-output (CR-MIMO) network to mitigate its interference to a primary time-division-duplexing (TDD) system. The proposed precoding schemes are capable of estimating interference channels between CR and primary networks, and incorporating the interference from the primary to the CR system into CR precodingdoi:10.1108/13683040210451660 fatcat:j72nqol4mne73kiprpmmzup2ne