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The paper presents a study of the application of DUSTM (differential unitary space-time modulation) on MIMO-OFDM systems with frequency-selective fading channels. From the point of view of the analysis of correlation between OFDM subcarriers, we obtain the maximum achievable diversity of DUSTM on MIMO-OFDM systems. Moreover, an efficient implementation strategy based on subcarrier reconstruction is proposed, which transmits all the signals of one signal matrix within an OFDM transmission, and performs differential processing between two adjacent OFDM blocks. The proposed method is capable of obtaining both spatial and multipath diversity while reducing the effect of channel time variations to a minimum. The performance improvement is confirmed by simulation results.