... symboldurations (see Figure 2). In many existing (non-CR) systems, “frame” is the time unit corresponding to the source and/ orchannel coding block. Thus, the channel measurement reporting for channel adaptation ... 10. In Hindawi Publishing CorporationEURASIP Journal on Wireless Communications and NetworkingVolume 2011, Article ID 650619, 7 pagesdoi:10.1155/2011/650619 Research Ar ticleChannel Sensing ... 2008.[4]S.S.Jeong,W.S.Jeon,andD.G.Jeong,“Dynamicchan-nel sensing management for OFDMA-based cognitive radio systems, ” in Proceedings of the IEEE Vehicular TechnologyConference (VTC ’07), Dublin, Ireland, April 2007.[5]S.S.Jeong,D.G.Jeong,andW.S.Jeon,“Nonquietprimaryuser...