Diversity allocation due to inter-relay cooperation for network-coded wireless networks

In conventional binary network coding (BNC), the decode condition constrains the achievement of diversity gain. In this paper, a novel network-coded scheme is proposed, where the inter-rely cooperation (IRC-NC) is employed to loose the above restriction. Firstly, two relays are divided into NC node and assistant node according to their channel gain to destination. This process is accomplished by the best rely selecting mechanism. Then, NC node codes and forwards the hybrid packet in optimal link while assistant node repeats its message in sub-optimal link simultaneously. The metric of un-retrieval probability is analytically deduced, and the result shows that the scheme outperforms BNC and has close performance with non-binary NC. Finally, the outage probability of the scheme is analyzed, and the simulations show that the proposed scheme is substantial superior (approximately 2 dB) to BNC.