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In this paper, the model for improving BER performance and spectrum efficiency of the pilot aided OFDM-CDMA downlink system is analyzed. The proposed MIMO OFDM-CDMA system uses space-time block coding applied to two and four transmit antennas and has arbitrary number of receive antennas. Bit error rate (BER) performance of the two competitive systems, in the case of Rician frequency selective fading, is evaluated using originally developed computer simulation. The results show that the analyzed system provides significantly lower BER, even with smaller frequency bandwidth, in comparison with its competitive solution.