Cooperative Communication of Revised Quasi-OSTBC in OFDMA Systems

In this paper, we propose a revised quasi-orthogonal spacetime block code that the decoder decouples the symbol detection problem into not pairs of transmitted symbols but each symbol. And then, it is applied to cooperative communication systems with 4 transmit antennas. Simulation results present the BER performances in cases of amplify-and-forward and decode-and-forward.