Self-interference cancellation in Full-Duplex MIMO System

Abstract

In this paper, a self-interference cancellation method is contemplated to remove the self-interference signal using the pilot-based channel estimation technique in MIMO full-duplex system. Since the most prominent issue in implementing MIMO full-duplex system is both hardware nonlinearities and signal interference. The proposed approach is utilized to significantly cope with self-interference due to other channels in the same chip of the MIMO system. Specifically, we offer a two-step procedure to estimate the channel between the desired output and signal of interest and the channel with desired output and an interfering signal. In the next step, perform self-interference cancellation. Numerical evaluation of the technique shows that the bit-error rate was reduced from an order of 10-1 to an order of 10-4, and the error vector magnitude was reduced from -6dB to a value of-35 dB.