Single-usermulti-antennatechnologiesarewellupportedincurrentstandardspecificationslikeLTERelease8/9.Furtherdevelopmentofthespecification(LTE-Advanced)isexpectedtoconformtotherequirementsforIMT-Advancedsystems.OneofthekeyenablingfeaturesofLTE-AdvancedtomeetIMT-Advanceddownlinkperformancerequ