Performance of RF self-interference cancellation disturbed by fast-moving object in full-duplex wireless

In this paper, the performance of radio frequency (RF) self-interference (SI) cancellation in presence of flying/moving object is analyzed to achieve an uninterrupted FD transmission and reception. The SI leaked typically consists of two parts: slow time-varying SI and burst SI part. For simplification, slow time-varying SI part can be effectively suppressed. In addition, burst SI part can be modeled as a single path SI signal. To detect and estimate the burst SI part, superimposing training sequence is introduced in the transmit signals. Correspondingly, one special RF tap is adopted to suppress the burst SI part. Based on this scheme, the expression of instantaneous and average outage probability is derived and this can be solved by numerical method. It is found that the FD outage probability is significantly influenced by the flying/moving object velocity, by Doppler frequency, by the distance between the flying/moving object and the transceiver antenna, and the transmitter signal-to-training ratio.