On the Performance of Cognitive Full-Duplex Relaying Systems under Spectrum Sharing Constraints

In this paper, assuming a spectrum sharing environment, we investigate the performance of a full-duplex dualhop cooperative cognitive network composed by one secondary source, one secondary relay, and one secondary destination, where this latter applies joint decoding with the signals received from the source and relay such that the direct link can be seen as useful information rather than interference. The effects of self-interference at the relay are taken into account in our analysis due to the full-duplex relaying nature. Closed-form expressions for the outage probability and throughput are derived and insightful discussions are provided. Our results show that the proposed joint decoding full-duplex dual-hop secondary network outperforms its dual-hop full-duplex and joint-decoding half-duplex counterparts, even in the presence of strong selfinterference.