Cooperative diversity with OSTBC transmission and adaptive-gain amplify-and-forward MIMO relaying

We propose a cooperative orthogonal space-time block codes (OSTBC) transmission scheme in the adaptive-gain amplify-and-forward MIMO relaying with N_S source antennas, N_R relay antennas, and N_D destination antennas, and analyze the asymptotic performance of the proposed scheme. Specifically, we explore the instantaneous channel state information (CSI) of source-to-relay channel and design an OSTBC transmission scheme by reconstructing the compound source-relay-destination channel. The asymptotic analysis in terms of symbol error rate (SER) in high SNR regime shows that the proposed scheme can achieve the diversity order N_SN_D+N_R min{N_S, N_D}. Numerical results that confirm our analysis are also presented in the paper.