The space-time spreading (STS), superimposed training sequences and space-time coding (STC) are adopted to obtain a closed-form of average error probability upper bound and maximum likelihood estimation expression for multiple input and multiple output (MIMO) correlated frequency-selective channel in the presence of interference(colored interference). Moreover, the correlation at both ends of the wireless link that can be incorporated equivalently into correlation at the transmit end is derived. Finally, the mean square error (MSE) of the maximum likelihood estimate is also derived.