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In this paper, the authors investigate the interference mitigation from a cross-layer perspective for a Cognitive Radio (CR) Multiple-Input Multiple-Output (MIMO) network coexisting with a primary Time-Division-Duplexing (TDD) system. The channel allocation in the Media Access Control (MAC) layer and a subspace-based precoding scheme in the physical layer of the CR network are jointly considered to minimise the interference to the primary user and maximise the CR throughput. Two distributed cross-layer algorithms, namely, Joint Iterative Channel Allocation and Precoding (JICAP) and Non-Iterative Channel Allocation and Precoding (NICAP), are proposed for the cases with and without channel information among CR nodes, respectively.
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