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Diversity of MMSE MIMO Receivers

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Executive Summary

In most MIMO systems, the family of waterfall error curves, calculated at different spectral efficiencies, is asymptotically parallel at high SNR. In other words, most MIMO systems exhibit a single diversity value for all fixed rates. The MIMO MMSE receiver does not follow this pattern and exhibits a varying diversity in its family of error curves. This effect cannot be captured by DMT analysis, due to the fact that all fixed rates correspond to the same multiplexing gain, thus they cannot be differentiated within DMT analysis. This paper analyzes this interesting behavior of the MMSE MIMO receiver and produces the MMSE MIMO diversity at each rate.

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