Blind self-interference cancellation for full-duplex relays

Abstract

Full-duplex relays increase the spectral efficiency and diversity, especially for the amplify and forward mode. However, transmission and reception in the same frequency band produce coupling between the transmitted and received signals that needs to be reduced. The cyclic prefix introduced in modern modulations produces a periodic autocorrelation that is perturbed by the relay coupling. We propose a blind adaptive algorithm to compensate for the coupling, that employs the known autocorrelation of the source signal as a reference. We study the proposed criterion and analyze the stationary points of the adaptive algorithm. Finally, we confirm the canceler performance using simulations.