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The aim of this paper is to reveal the importance of hybrid successiveinterference cancellation (SIC) and power adaptation (PA) for improvingtransmission robustness of uplink non-orthogonal multiple access (NOMA).Particularly, a cognitive radio inspired uplink NOMA communication scenario isconsidered, where one primary user is allocated one dedicated resource block,while M secondary users compete with each other to be opportunistically servedby using the same resource block of the primary user. Two novel schemes areproposed for the considered scenario, namely hybrid SIC with PA (HSIC-PA)scheme and fixed SIC with PA (FSIC-PA) scheme. Both schemes can ensure that thesecondary users are served without degrading the transmission reliability ofthe primary user compared to conventional orthogonal multiple access (OMA)based schemes. Rigorous analytical results are presented to evaluate theperformance of the proposed two schemes. It is shown that both schemes canavoid outage probability error floors without any constraints on users' targetrates in the high SNR regime. Furthermore, it is shown that the diversity gainachieved by the HSIC-PA scheme is M, while that of the FISC-PA scheme is only1. Numerical results are provided to verify the developed analytical resultsand also demonstrate the superior performance achieved by the proposed schemesby comparing with the existing HSIC without PA (HSIC-NPA) scheme. The presentedsimulation results also show that HSIC-PA scheme performs the best among thethree schemes, which indicates the importance of the combination of HSIC and PAfor improving transmission robustness.

Hybrid Successive Interference Cancellation and Power Adaptation: a Win-Win Strategy for Robust Uplink NOMA Transmission