The space-time multiuser detection scheme is applied to Turbo-BLAST system to form a multiuser Turbo-BLAST system. A scheme for de-correlating and interference cancellation detection technique is proposed in the presence of channel state information imperfection. At the transmitter, V-BLAST structure is combined with CDMA technique for spatial multiplexing. At the receiver, the de-correlating algorithm is employed to remove the multiuser interference first, and then the iterative interference cancellation scheme which takes the channel estimation errors into account is introduced to mitigate the co-antenna interference. Simulation results show that the proposed space-time multiuser model is effective in the presence of channel state information imperfection，it makes the detection of every user be comparatively independent, and benefits for application of the traditional Turbo-BLAST scheme.
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