A Multichannel Self-Interference Cancellation Prototyping System

This paper presents the design and implementation of a multichannel self-interference cancellation system. The proposed design achieves self-interference cancellation via sequential transmit and receive beamforming. The prototype experiments prove that this system not only can suppress the self-interference to the receiver's noise floor over a wide bandwidth, but it is also a simple, flexible and robust solution for diverse self-interference cancellation applications under changing propagation environment. The experimental results give more than 90dB self-interference cancellation over the air on 20MHz and 80MHz receiving band.