Abstract：In the Space-Time-Frequency(STF) coded MIMO-OFDM system, dividing the subchannels into groups of less correlated subchannels and applying STF coding to group STF(GSTF) subsystems, this paper proposes novel the optimal training design for GSTF systems where one group is assigned for training and others groups are for data, and the channel estimation based on the optimal training sequence is extended into Space-Time-Frequency dimensions with considering the time dimension. Theoretical analysis and numerical results show that the scheme gives distinct improvements in the channel estimates on frequency-selective fading channels with low coding and decoding complexity.
2008, Vol. 30 
