Full-Duplex Cooperative NOMA With Signal Space Diversity: Minimizing SIC Operations

In this work, a novel signal-space-diversity-based full-duplex (FD) cooperative non-orthogonal multiple access (SFD-CNOMA) system is introduced for a multi-user scenario. In the proposed system, cell-centered and cell-edge users’ information will be multiplexed in the superimposed signal’s inphase and quadrature components. This reduces successive-interference-cancellation (SIC) operations, detection delay, and complexity compared to conventional FD cooperative NOMA (CFD-CNOMA). An analytical framework is introduced to assess the average sum rate, outage probability, and diversity order for both perfect and imperfect SICs, considering order statistics. Comparative analysis demonstrates that SFD-CNOMA outperforms CFD-CNOMA under both perfect and imperfect SICs.