Lattice-based cooperative communications for two-path relay channels with direct link

In this paper two-path relay channels with direct link between the source and the destination are considered. We present a decode-and-forward cooperative transmission scheme based on nested lattice codes. The proposed scheme performs complete inter-relay interference (IRI) cancellation at the relays as well as successive decoding at the destination, which efficiently combines the signals from the source and the relays. We derive the achievable rates of the proposed scheme, and show that our scheme considerably outperforms the existing schemes in the literature.