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Thanks to improvement in successive interference cancellation (SIC), non-orthogonal multiple access (NOMA) can be implemented in 5G communications. In this paper, the cooperative NOMA (C-NOMA) systems is investigated in two proposed schemes, namely perfect hardware cancellation (PC) and imperfect hardware cancellation (IC) considering on efficiency of hardware noise cancellation operations. The first scenario is that perfect processing between the relay and the far user. In the second scenario, the hardware noise resulted by imperfect circuit at relay for NOMA operation. To illustrate the performance of C-NOMA in two considered scenarios, the closed-form expressions for both exact and asymptotic outage probability are derived for each NOMA user. Simulation results validate that the outage performance of C-NOMA with IC scheme is superior to C-NOMA with PC scheme at low SNR region rather than at high SNR region.

Investigation on Tradeoff between Hardware Noise and Outage Performance in Cooperative NOMA