Effective Resource Utilization for Cooperative Relaying Selections with Opportunistic NOMA

【摘要】：This paper investigates an effective resource uti-lization scheme for the cooperative relaying networks(CRN)with non-orthogonal multiple access(NOMA).Considering a Ttime slots transmission,the proposed effective resource utilization scheme adopts max-min relay selection to satisfy the quality of service(QoS)and provide a higher priority.Unlike the conven-tional CRN,to improve the system performance and resource utilization,the unselected relays will continue listening the signals transmitted by the base station(BS),as well as the selected relays forward the decoded signals to the user equipment(UE).Moreover,the maximum ratio combining(MRC)is utilized at the UE to jointly detect the receptions for each phase.The achievable average SR of the proposed system is analyzed for independent Rayleigh fading channels,and also the asymptotic expressions are also provided.Qualitative numerical results corroborating our theoretical analysis show that the proposed effective resource utilization scheme significantly improves the SR performance in comparison to the conventional CRN-NOMA schemes.