The asynchronous cooperative amplify-and-forward relay network with partial feedback to improve the system performance

In this paper, a new near-optimum detection (NOD) scheme is combined with partial feedback technique for two dual-antenna relay nodes in the amplify-and-forward (AF) asynchronous cooperative relay network. The application of partial feedback in the proposed scheme not only offers to reduce a cooperative relaying process due to not using distributed close loop extended orthogonal space-time block code (DCL EO-STBC) encoder, but also improves the end-to-end signal noise ratio (SNR). Moreover, a near-optimum detection (NOD) scheme is used at the destination to remove completely the interference components induced by inter-symbol interference (ISI) among the relay nodes. The analysis and simulation results demonstrate that the performance of the proposed scheme outperforms the previous feedback scheme in both the perfect synchronization and imperfect synchronization assumption cases. © Springer International Publishing AG 2017.