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We derive a simple characterization of the diversitymultiplexing (D-MG) tradeoff in three multiuser scenarios -multiple access, broadcast and relay assuming channel knowledge at the transmitters. Specifically, we study the D-MG tradeoff of protocols in literature that opportunistically use the channel knowledge to maximize the information rate. We show that for the multiple access channel with K users, a feedback of log K bits is sufficient to maximize the multiuser diversity gain. Thedoi:10.1109/ciss.2007.4298340 dblp:conf/ciss/JosiamR07 fatcat:uupgqj4ljfghploemzy5cisl74