Performance analysis of two-way full-duplex amplify-forward relay systems

In this paper, we investigate a two-way full-duplex (TWFD) amplify-forward (AF) relay cooperative communication system, of which all transceiver nodes operate in full-duplex (FD) mode. Considering that the self-interference (SI) introduced by the Co-time Co-frequency transceiver is closely related to the local transmitting power, we view the average power of residual self-interference (RSI) as the transmitting power multiplied by one coefficient representing the SI cancelation capability quantitatively. We analytically derive the exact expressions of the outage probabilities for the forward and backward links. Besides, we investigate the achievable rate which can hardly be obtained in closed-form, however, an approximate expression for it as one upper bound is given by the Jensen´s inequality. Numerical results are also provided to verify the validity of theoretical analysis.