Relaying with distributed interference alignment in multi-node networks

A system with multiple transmitters (i.e. base stations) and multiple receivers (mobile nodes) is considered. The transmitter-receiver pairs are assumed to operate using the same resources without any coordination and hence the receivers unavoidably experience interference from undesired transmitters. A MIMO relaying scheme is proposed to manage the interference in the network by judiciously optimizing the relay precoding matrix and aligning the interference at each receiver simultaneously. It is shown that the proposed scheme provides a closed-form optimal precoding matrix. Moreover, the numerical results for various scenarios show that the scheme performs better than the considered baseline schemes for most of the channel conditions.