An Adaptive Non-Orthogonal Cooperation Scheme Based on Channel Quality Information

We consider cooperative relay communication in a wireless network composed of three nodes and limited by the half-duplex and total power constrained. Here we focused on the non-orthogonal transmission of relay node to achieve higher spectrum efficiency. Based on the channel quality information (CQI) at the relay node, an adaptive non- orthogonal cooperative scheme is proposed which combines the benefit of the amplify-and-forward and decode-and- forward strategies. The relay node adoptively chooses one of these two strategies to cooperate in order to obtain larger average mutual information between the source and destination node. When the CQI is available at the source node, the power allocation is utilized to improve the performance of the adaptive cooperation scheme.