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
_S
N
_D
+N
_R
min{N
_S
, N
_D
}. Numerical results that confirm our analysis are also presented in the paper.