  In this paper, we study a multi-user multi-relay interference-channel
network, where energy-constrained relays harvest energy from sources' radio
frequency (RF) signals and use the harvested energy to forward the information
to destinations. We adopt the interference alignment (IA) technique to address
the issue of interference, and propose a novel transmission scheme with the IA
at sources and the power splitting (PS) at relays. A distributed and iterative
algorithm to obtain the optimal PS ratios is further proposed, aiming at
maximizing the sum rate of the network. The analysis is then validated by
simulation results. Our results show that the proposed scheme with the optimal
design significantly improves the performance of the network.
