Research on The Effect of Phased Array Beam Scanning on Self-interference Cancellation

Aiming at the application of full-duplex (FD) method in phased array system, based on the modeling of coupling path characteristics for different spatial links using adaptive system identification method, the effect of self-interference cancellation (SIC) influence of beam scanning toward different directions is studied under practical experiments. From the experiments' results, the performance difference of self-interference cancellation after adaptive filtering for different beam scanning directions between the best result and the worst is more about 33dB. As for the boresight line of the transmission array, the SIC result is the best. If the scanning directions are off the boresight line, the SIC result is usually worse than that of the boresight line. Therefore, we can draw the conclusion that, for phased array system, beam scanning plays an important role on self-interference cancellation for simultaneous transmit and receive (STAR).