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In order to obtain high spectral efficiency and high-rate packet transmission, this paper has proposed a STBC-OFDM system to solve the problem of Multi-fading Channels for wideband wireless communication system. Considering the Frequency Selective Channels (FSC), the paper gives the many simulation results of BER based on SNR when the system adopted different number of receiving and transmitting antennas, and with or without random interleaver. The results show the detail impact of FFT and the number of sub-carriers on the system. The interleaver can improve the performance of system greatly and will get a reasonable robustness in future wireless system.