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We consider the problem of Cyclic Interference Alignment (IA) on the 3-userX-network and show that it is infeasible to exactly achieve the upper bound of$\frac{K^2}{2K-1}=\frac{9}{5}$ degrees of freedom for the lower bound of n=5signalling dimensions and K=3 user-pairs. This infeasibility goes beyond theproblem of common eigenvectors in invariant subspaces within spatial IA.  In order to gain non-asymptotic feasibility with minimal intervention, wefirst investigate an alignment strategy that enables IA by feedforwarding asubset of messages with minimal rate. In a second step, we replace the proposedfeedforward strategy by an analogous Cyclic Interference Alignment andCancellation scheme with a backhaul network on the receiver side and also by adual Cyclic Interference Neutralization scheme with a backhaul network on thetransmitter side.

Cyclic Interference Alignment and Cancellation in 3-User X-Networks with Minimal Backhaul