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1、884IEEETRANSACTIONSONCOMMUNICATIONS,VOL.47,NO.6,JUNE1999OnthePerformanceofAdaptiveModulationinCellularSystemsXiaoxinQiu,Member,IEEE,andKapilChawla,SeniorMember,IEEEAbstractÐAdaptivemodulationtechniqueshavethepoten-QAMhasbeenproposedforseveralthird-generationwirelesstialt
2、osubstantiallyincreasethespectrumefficiencyandtocommunicationssystems[7].providedifferentlevelsofservicetousers,bothofwhichareIthasbeenshownin[2]±[4]thatadaptivemodulationconsideredimportantforthird-generationcellularsystems.IneffectivelyimprovestheBERperformanceonradioch
3、annelsthiswork,weproposeageneralframeworktoquantifythepotentialgainsofsuchtechniques.Specifically,westudythewhichsuffershadowingandfading.In[2],itisdemonstratedthroughputperformancegainthatmaybeachievedbycombiningthatinasingleusercase,usingadaptivemodulationcanadaptivemod
4、ulationandpowercontrol.Ourresultsshowthat:providea5±10-dBgainoverafixedratesystemhavingonly1)usingadaptivemodulationevenwithoutanypowercontrolpowercontrol.In[8],theauthorsstudyaso-calledaverageprovidesasignificantthroughputadvantageoverusingsignal-to-interference-plus-nois
5、eratio(SINR)balancingpowercontrolandareaspectralefficiency(ASE),definedasthecumulative2)combiningadaptivemodulationandasuitablepowercontroldatarateperhertzperunitarea,whichcanbeachievedbyschemeleadstoasignificantlyhigherthroughputascomparedusingadaptivemodulation.Usingsimul
6、ationsandanalysis,tonopowercontrolorusingSINR-balancingpowercontrol.ThetheimpactofvarioussystemconfigurationsandsettingsonthefirstobservationisespeciallyimportantfromanimplementationASEisquantified.Inparticular,theauthorsobtainthechannelpointofview.Adjustingthemodulationlev
7、elwithoutchangingthetransmissionpowerrequiresfarfewermeasurementsandreusepatternsthatmaximizetheASEfordifferentinterferencefeedbackascomparedtotheSINR-balancingpowercontrolscenarios.In[9],theauthorsproposeanadaptivemodulation-ortheoptimalpowercontrol.Hence,itissignificant
8、lyeasierbasedcellularsystemforpersonalmultimediacommunica-toimplement.Althoughpresentedinthecontextofad
