Log-Convexity of Rate Region in 802.11e WLANs
  In this paper we establish the log-convexity of the rate region in 802.11 WLANs. This generalises previous results for Aloha networks and has immediate implications for optimisation based approaches to the analysis and design of 802.11 wireless networks. 
Douglas J. Leith, Vijay G. Subramanian and Ken R. Duffy
cs.NI