Outage Performance Analysis of Cognitive Radio Non-Orthogonal Multiple Access System under Non-ideal Conditions

To meet the network requirements and improve the utilization of system spectrum, a Cognitive Radio Non-Orthogonal Multiple Access (CR-NOMA) technology is proposed. To investigate the system reliability, NonLinear Power Amplification (NLPA), incomplete Successive Interference Cancellation (ipSIC) and incomplete Channel State Information (CSI) are taken into account. The analytical expressions of system Outage Probability (OP) and system throughput are derived, and the expressions of outage probability under high SNR, high SNR approximation of outage probability under ideal state and diversity order are further analyzed. The simulation results show that: NLPA, ipSIC and channel estimation error parameters have negative effects on interrupt probability; The interrupt probability decreases with the increase of SNR until it converges to a fixed constant at a high SNR; Interruption probability will also change with the change of power distribution coefficient.