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Exploiting impact of imperfect CSI on Performance of Backscatter-Aided NOMA System

In this paper, we consider the impact of imperfect channel state information (CSI) on outage probability of users in an ambient backscatter (AB) enabled nonorthogonal multiple access (NOMA) network. In our proposed scheme, a source node communicates with two destinations via a radio frequency-powered device. Such device is assume with ability of backscattering the signals from the base station. We derive expressions to show the outage probability of main nodes in such system. The analytical expressions for the outage probability are checked with Monte-Carlo simulations. It has been shown that the analytical results match the simulation results. In particular, the user with higher allocated power exhibits its performance better than another 10%-15% when signal to noise ratio (SNR) at the source node is 30 dB.