  The main objective of this project is to design the full-rate
Space-Time-Frequency Trellis code (STFTC), which is based on Quasi-Orthogonal
designs for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division
Multiplexing (OFDM) systems. The proposed Quasi-Orthogonal Space-Time-Frequency
Trellis code combines set partitioning and the structure of quasi-orthogonal
space-frequency designs in a systematic way. In addition to multipath diversity
and transmit diversity, the proposed code provides receive diversity, array
gain, and achieve high-coding gain over a frequency selective fading channel.
As simulation results demonstrate, the code outperforms the existing
Quasi-Orthogonal Space-Time-Frequency Trellis codes in terms of frame error
rate performance.
