Cognitive radio_ brain-empowered wireless communications

Abstract—Cognitiveradioisviewedasanovelapproachforimprovingtheutilizationofapreciousnaturalresource:theradioelectromagneticspectrum.Thecognitiveradio,builtonasoftware-definedradio,isdefinedasanintelligentwirelesscommunicationsystemthatisawareofitsenvironmentandusesthemethodologyofunder