Marcus L. Roberts Michael A. Temple Robert F. Mills Richard A. Raines Evolution of the air interface of cellular communications systems toward 4G realization. 2-23 2006 8 IEEE Communications Surveys and Tutorials 1-4 http://dl.comsoc.org/cocoon/comsoc/servlets/OntologySearch?query=&node=TOC1642&render=false&type=1 db/journals/comsur/comsur8.html#RobertsTMR06