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In this paper, the authors shed light on the cross-layer interactions between the PHY, link and routing layers in networks with MIMO links operating in the diversity mode. Many previous studies assume an overly simplistic PHY layer model that does not sufficiently capture these interactions. They show that the use of simplistic models can in fact lead to misleading conclusions with regards to the higher layer performance with MIMO diversity. Towards understanding the impact of various PHY layer features on MIMO diversity, they begin with a simple but widely-used model and progressively incorporate these features to create new models. They examine the goodness of these models by comparing the simulated performance results with each, with measurements on an indoor 802.11n testbed.
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