Abstract
In this article, we propose a design method of a digital filter that suppresses self-interference arising at a single-frequency full-duplex wireless relay, and also compensates frequency selective fading from a source station to the relay station. The signals and the wireless relaying system can be modeled as random processes and a discrete-time linear time-invariant system respectively. We formulate the filter design problem based on the minimum-mean-square error (MMSE) criterion. It is shown that the filter design problem is equal to an H2 optimal control problem. The effectiveness of the proposed method is shown by simulations.
