REPORTITU-RM.2040

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1、Rep.ITU-RM.204031REPORTITU-RM.2040Adaptiveantennasconceptsandkeytechnicalaspects(QuestionITU-R224/8)(2004)1IntroductionThisReportidentifiesthekeyadaptiveantennaconceptsanddescribestheirtechnicalaspects.Thetraditionalapproachtotheanalysisanddesignofwirelesssystemshasgenerallybeentoaddre

2、ssantennasystemsseparatelyfromotherkeysystemsaspects,suchas:-propagationissues;-interferencemitigationtechniques;-systemorganization(accesstechniques,powercontrol,etc.);-modulation.Adaptiveantennatechnologiesarebestimplementedwithanoverallsystemapproach,whereallthesystemcomponents,incl

3、udingtheantennasystem,areintegratedinanoptimalway,leadingtosubstantialcoverageimprovements(e.g.largercoveragearea,reduced“holes”incoverage)foreachcell,vastlysuperiormitigationofinterferenceproblems,andsubstantialsystemcapacityimprovements.ThisReportreviewsthevariousconceptsofadaptivean

4、tennas,includingtheconceptof“spatialchannels”,providesatheoreticalanalysisofthepotentialofthetechnologyandidentifiesthekeycharacteristics.AttachedasAnnex1isaglossaryofrelevantterminologyforadaptiveantennasystems.1.1RelatedRecommendationsThefollowingITU-RRecommendationsmaybeusefulinthat

5、theyaddressmobilesystemstowhichtheconceptsconsideredheremaybeconsideredappropriatetoagreaterorlesserdegree:RecommendationITU-RM.622:TechnicalandoperationalcharacteristicsofanaloguecellularsystemsforpubliclandmobiletelephoneuseRecommendationITU-RM.1032:Technicalandoperationalcharacteris

6、ticsoflandmobilesystemsusingmulti-channelaccesstechniqueswithoutcentralcontrollerRecommendationITU-RM.1033:TechnicalandoperationalcharacteristicsofcordlesstelephonesandcordlesstelecommunicationsystemsRecommendationITU-RM.1073DigitalcellularlandmobiletelecommunicationsystemsRecommendat

7、ionITU-RM.1074:IntegrationofpublicmobileradiocommunicationsystemsRecommendationITU-RM.1221:TechnicalandoperationalrequirementsforcellularmultimodemobileradiostationsRep.ITU-RM.204031RecommendationITU-RM.1457:DetailedspecificationsoftheradiointerfacesofInternationalMobileTelecommunica