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Joint Transmit-Receive Spectrum Sharing in Cognitive MIMO Wireless Networks

This paper proposes a joint transmit-receive spectrum sharing method based on space division multiplexing (SDM) in cognitive radio networks (CRN). By exploiting spatial correlation features between cognitive transmission and interference from cognitive base station (CBS) to primary user (PU) as well as interference from primary base station (PBS) to cognitive user (CU), appropriate primary system and its channel are selected. Consequently spectrum sharing is carried out employing the proposed SDM based strategy. The method is a good complement for conventional cognitive radio (CR) which adopts opportunistic spectrum access. Analysis and simulation results show that compared with the method implemented only at CBS and exhaustive searching, the proposed scheme could achieve near-optimal throughput performance with reduced complexity.