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In this paper, an asynchronous multiple-input multiple-output multitone code division multiple access (MIMO MT-CDMA) scheme for the uplink of the mobile communication in a frequency selective fading channel is analyzed. Maximum ratio combining (MRC) and linear zero-forcing (ZF) V-BLAST detectors are applied at the receiver. The average bit error rate (BER) expression for uniform multipath power profile is derived when the number of receive antennas is greater than that of transmit antennas. Numerical results verify the BER expression and show that the number of transmit and receive antennas has a significant effect on the BER performance. Space diversity and path diversity have different abilities to improve the performance. The average BER performance of the proposed system is also compared with that of a conventional MT-CDMA system.