부산대학교 도서관

Nonorthogonal multiple access (NOMA) has been proposed to accommodate the massive connectivity in future wireless communications. In power domain-NOMA (PD-NOMA), user signals are allocated different power levels and multiplexed by using superposition coding. NOMA requires to employ interference cancellation schemes such as successive interference cancellation (SIC) at receivers. In the SIC receivers, the use of lower resolution analog-to-digital converters (ADCs) is favorable in terms of energy consumption, although it might lead to the degradation in signal detection performance. The phenomenon called stochastic resonance (SR) has been attracting attention as a method to improve the signal detection performance of nonlinear systems. The application of SR to the ADCs in the SIC receiver, has been proposed. However, there has been no evaluation using specific indicators and not enough practical application discussion. In this study, we extend our previous work to be applicable to multilevel modulated signals by conducting more detailed investigations considering the amplitude resolution. Through computer simulations, we confirmed the effect of SR in lower resolution ADCs and clarified the specific situation in which the proposed SIC receiver could be used effectively.