Takehiro Kawata Hiroshi Yamada Adaptive Multi-Rate VoIP for IEEE 802.11 Wireless Networks with Link Adaptation Function. 2006 conf/globecom/2006 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2006.755 db/conf/globecom/globecom2006wlc.html#KawataY06