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In this paper, we study interference-free uplink transmission for two-cell multiple-antenna cognitive radio (CR) networks. We consider a scenario that the primary user (PU) transmission is based on orthogonal frequency-division multiplexing (OFDM) and the nullspace generated by the cyclic-prefix (CP) can be used for CR transmission using Vandermonde-subspace frequency division multiplexing (VFDM)...
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