Full-duplex two-way AF relaying systems with imperfect interference cancellation in Nakagami-m fading channels

Abstract

Full-duplex (FD) two-way relaying has the potential to substantially improve the spectral efficiency of the system, and is regarded as an enabling technology for the next generation wireless communication systems. Nevertheless, the joint effect of residual interference and channel fading condition on the fundamental performance of FD two-way relaying systems remains unclear. Motivated by this, this study considers a general FD two-way amplify-and-forward (AF) relaying system with imperfect interference cancellation in the versatile Nakagami-m fading channels, and presents a detailed analytical investigation on the outage performance of the system. The findings of the paper suggest that the performance of the FD two-way AF relaying system depends heavily on the residual interference strength, fading condition parameter m, and signal-to-noise ratio (SNR). The FD scheme outperforms the half-duplex (HD) two-way relaying counterpart in the low and moderate SNR regime, while becomes inferior in the high SNR regime, owing to strong residual interference. Also, compared to the channel fading condition of the information transmission channels, the impact of the channel fading condition of the interference channel on the system performance is relatively insignificant. Moreover, it is desirable to deploy the FD scheme when the channel fading condition of the information transmission channels is good, since it can effectively alleviate the detrimental effect of residual interference.