Exploiting Performance of Ambient Backscatter Systems in Presence of Hardware Impairment

In the context of ambient Backscatter systems, Backscatter devices (tags and readers) transmit data by employing existing Radio Frequency (RF) signals. Most prior works consider perfect hardware impairment and apply the Orthogonal Multiple Access (OMA) technique, but this paper investigates the case of Outage Probability (OP) reduction situation when the hardware is imperfect, especially when the NonOrthogonal Multiple Access (NOMA) technology is applied. Consequently, we design a downlink of transmission from base station to destination to highlight different performances among users. Furthermore, to indicate the impact of levels of hardware impairment, we develop the closed-form expressions of OP for different kinds of users. Finally, extensive simulation results validate the analysis and illustrate the effectiveness of the proposed system.