Improved space-time Trellis code in OFDM system

In this paper, we have studied the space-time trellis code (STTC) design in an OFDM system. By research, especially by simulation, it is shown that in multi-flat fading channels; the STTC-OFDM system can potentially provide more code gain. We also found that the optimal STTC design is important for OFDM when using space-time code (STC). By following this conclusion, an improved STTC is designed. Computer simulations have demonstrated the significant performance improvement of our proposed STTC-OFDM over the conventional STTC-OFDM. Further research for STTC-OFDM system in other channels can also be pursued according to this scheme.