  In this work, the Multiple transmit antennas Multiple Access Channel is
considered. A construction of a family of distributed space-time codes for this
channel is proposed. No Channel Side Information at the transmitters is assumed
and users are not allowed to cooperate together. It is shown that the proposed
code achieves the Diversity Multiplexing Tradeoff of the channel. As an
example, we consider the two-user MIMO-MAC channel. Simulation results show the
significant gain offered by the new coding scheme compared to an orthogonal
transmission scheme, e.g. time sharing.
