The Degrees of Freedom of the 2-Hop, 2-User Interference Channel With Feedback
The layered two-hop, two-flow interference network is considered that consists of two sources, two relays and two destinations with the first hop network between the sources and the relays and the second hop network between relays and destinations both being i.i.d. Rayleigh fading Gaussian interference channels. Two feedback models are studied. In the first one, called the delayed Channel State Information at the Sources (delayed CSI-S) model, the sources know all channel coefficients with a finite delay but the relays have no side information whatsoever.