Performance Analysis of Impaired SWIPT NOMA Relaying Networks Over Imperfect Weibull Channels

This letter considers a simultaneous wireless information and power transfer nonorthogonal multiple access network, where the relay is energy constrained and harvests energy from the source radio frequency signals using a time-switching protocol. Our analysis accounts for imperfect channel state information (ICSI) and residual hardware impairments (RHIs). To characterize the effects of the two imperfections brought in the considered network, the outage probability (OP) and throughput are investigated. More particularly, we derive a lower bound on the OP in closed-form, as well as the asymptotic OP and diversity order. We also investigate the throughput in the delay-limited transmission mode in terms of deriving corresponding expression. It is observed that the performance of system is limited by RHIs and ICSI, which results in error floor for the OP and zero diversity order. In addition, a key conclusion is that by carefully selecting the ratio factor between the energy harvesting and information transmission phases, the throughput can be maximized.