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In this paper, the authors use real experiments to study MIMO 802.11n Rate Adaptation (RA) on a programmable AP platform. The results reveal nontrivial inter-, intra-mode opportunistic gains with respect to transient channel variations in both MIMO operation modes of Diversity and Spatial Multiplexing. To exploit these short-term gains, they design and implement a new Window-based Rate Adaptation (WRA) algorithm. WRA differently from existing MIMO 802.11n proposals, runs an independent RA in each MIMO mode in parallel, to address the unique characteristics of each MIMO mode.
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