Analysis performance of full duplex two-way systems using assistance of UAV with hardware impairments

Full-duplex (FD) transmission and unmanned aerial vehicle (UAV) communication are techniques that are expected to enhance the spectrum efficiency of wireless communication systems. In this paper, a two-way (TW) system in which two FD terminals communicate with the support of an FD-UAV (FDU) is investigated in both cases of ideal hardware (without (Wo) hardware impairments (HIs)) and with (Wi) HIs. The joint and cross effects of HIs and residual self-interferences (RSIs) are deeply evaluated in the TW-FDU system. The mathematical formulas of the outage probability (OP) and throughput of the TW-FDU-Wo-HI and TW-FDU-Wi-HI systems are theoretically derived over realistic channels recommended for the fifth and beyond generations (5G/B5G). Numerical results confirm that the TW-FDU-Wo-HI system is greatly affected by RSIs generated by FD transmission of all terminals. Whereas, the TW-FDU-Wi-HI system is significantly affected by both RISs and HIs. The OP and throughput of the TW-FDU-Wi-HI system are saturated faster than those of the TW-FDU-Wo-HI system, especially when high transmission power and high transmission rate are utilized. Moreover, when either the HI level or RSI level is large enough, the impact of the other parameter (RSI or HI) can be ignored. Besides considering the effects of HIs and RSIs, we also investigate the impact of other key parameters, such as the required rate, carrier frequency, and UAV altitude on the OP and throughput of the considered system with fixed and variable gains. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.