MIMO Rate Adaptation in 802.11n Wireless Networks

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Executive Summary

This paper studies MIMO based Rate Adaptation (RA) in 802.11n wireless networks. The case study shows that existing RA algorithms offer much lower throughput than even a fixed-rate scheme. The fundamental problem is that, all such algorithms are MIMO oblivious; they do not consider the characteristics of diversity-oriented, single-stream mode and the spatial multiplexing driven, double-stream mode. The authors propose MiRA, a novel MIMO RA scheme that zigzags between intra- and inter-mode rate options.

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