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We establish the optimal diversity-multiplexing (DM) tradeoff for coherentselective-fading multiple-access MIMO channels and provide corresponding codedesign criteria. As a byproduct, on the conceptual level, we find aninteresting relation between the DM tradeoff framework and the notion ofdominant error event regions, first introduced in the AWGN case by Gallager,IEEE Trans. IT, 1985. This relation allows us to accurately characterize theerror mechanisms in MIMO fading multiple-access channels. In particular, wefind that, for a given rate tuple, the maximum achievable diversity order isdetermined by a single outage event that dominates the total error probabilityexponentially in SNR. Finally, we examine the distributed space-time codeconstruction proposed by Badr and Belfiore, Int. Zurich Seminar on Commun.,2008, using the code design criteria derived in this paper.

Selective-Fading Multiple-Access MIMO Channels: Diversity-Multiplexing Tradeoff and Dominant Outage Event Regions