Generalized prefix approach for alamouti coded OFDM systems over Gaussian channels correlated in space

In this work¹, generalized frefix (GP) for space time block coded orthogonal frequency division multiplexing (STBC-OFDM) systems is considered in the presence of correlated channel. The 2×2 STBC case, in practice, lead to significant correlation among the spatial signatures and reduce the systems performance. There are several structures to reduce correlation. To solve this problem, we propose the generalized prefix that has low computational complexity. It is shown that the proposed generalized prefix for 2×2 STBC-OFDM outperforms the conventional 2×2 STBC-OFDM system.