MIMO Rate Adaptation in 802.11n Wireless Networks
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.