Cooperative Algorithms for MIMO Amplify-and-Forward Relay Networks
Interference alignment is a signaling technique that provides high multiplexing gains in interference channels. It can be extended to multi-hop interference channels, where relays aid transmission between sources and destinations. In addition to coverage extension and capacity enhancement, relays enhance the multiplexing gain in the interference channel. In this paper, three cooperative algorithms are proposed for a multiple-antenna amplify-and-forward two-hop interference channel. The algorithms use the spatial dimensions at the transmitters and the relays to forward interference to the receivers so that interference can be aligned and canceled.