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The degrees of freedom (DoF) of an X-network with M transmit and N receivenodes utilizing interference alignment with the support of $J$ relays eachequipped with $L_j$ antennas operating in a half-duplex non-regenerative modeis investigated. Conditions on the feasibility of interference alignment arederived using a proper transmit strategy and a structured approach based on aKronecker-product representation. The advantages of this approach are twofold:First, it extends existing results on the achievable DoF to generalized antennaconfigurations. Second, it unifies the analysis for time-varying and constantchannels and provides valuable insights and interconnections between the twochannel models. It turns out that a DoF of $\nicefrac{NM}{M+N-1}$ is feasiblewhenever the sum of the $L_j^2 \geq [N-1][M-1]$.

A Systematic Approach for Interference Alignment in CSIT-less Relay-Aided X-Networks