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The performance of adaptive multiple-input multiple-output (MIMO) radar waveforms is examined. We begin by defining a metric, called "MISO cancellation ratio", for numerically screening MIMO waveforms so as to assess their clutter cancellation performance. Next, we evaluate the MISO cancellation ratio levels provided by a number of MIMO waveform classes. Finally, we describe a new MIMO waveform approach, called "dithered DDMA" (Doppler division multiple access), which enables high performance clutter cancellation over a large range-Doppler region without introducing ambiguous ranges or blind speeds, and without increasing the computational load on the MIMO processor.