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A new near optimum receiver for linear MIMO channels is proposed. The main structure of this receiver is based on estimation of spatial signature matrix and soft joint detection of the received signal. In the proposed joint detector, by some modification on the feedback structure of iterative joint detectors, the probability of convergence to local minima is decreased. From various simulations, it has been shown that the receiver is efficient for trellis MPSK coded signals. The computational complexity of the channel estimator and soft joint detector has a linear relationship with the number of transmitter and receiver antennas and the tracking speed of the channel estimator is relatively sufficient. Therefore, the proposed receiver can be used in high bit rate wireless communication services.