MIMO rate adaptation in 802.11n wireless networks

Authors:
Ioannis Pefkianakis;Yun Hu;Starsky H.Y. Wong;Hao Yang;Songwu Lu
Affiliations:
University of California at Los Angeles, Los Angeles, CA, USA;University of Science and Technology of China, Hefei, China;IBM Research, New York, NY, USA;Nokia Research, New York, NY, USA;University of California at Los Angeles, Los Angeles, CA, USA
Venue:
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Year:
2010

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Abstract

This paper studies MIMO based rate adaptation (RA) in 802.11n wireless networks. Our 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. We propose MiRA, a novel MIMO RA scheme that zigzags between intra- and inter-mode rate options. Our experiments show that MiRA consistently outperforms three representative RA algorithms, SampleRate, RRAA and Atheros MIMO RA, in static, mobility and collision settings.