Joint spatial modulation and Hierarchical Modulated Network Coding for multi-user Relay cooperative Networks

In this paper, we emphasis on the analysis of system transmission performance of the multi-user relay cooperative networks. Considering the complexity and variety of channel state information, we propose a novel transmission scheme for the multi-user relay cooperative networks aiming at exploiting the asymmetry of bidirectional relay channel, namely, spatial modulation and hierarchical modulated network coding (SM-HM-NC) scheme. First, we establish a cooperative relay communication system model which exploits hierarchical modulation at each source node. And then, an encoding strategy which exploits physical layer network coding and spatial modulation at relay nodes is proposed. Furthermore, the theoretical calculation formula of end-to-end bit error rate is derived. Finally, simulation results are given to verify the theoretical analysis results. It can be seen that compared with traditional hierarchical modulated network coding (HM-MC) scheme, the proposed scheme has better bit error rate performance, and thus can enhance transmission reliability.