An interference alignment scheme using partial CSI for large partially connected relay networks

In this paper, we consider large partially connected relay networks made up of multiple subnetworks. An interference alignment scheme using only partial channel state information is proposed. In particular, every node and the relay only knows the intra-subnetwork channel of the corresponding subnetwork, the network topology, and the side information from other subnetworks. The proposed scheme requires no additional relay antennas as compared to interference alignment using full channel state information. Furthermore, the proposed scheme can be parallelized to reduce the delay in large networks.