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1、GMSKmodulationdemodulationsystemBackgroundGMSK,withexcellentspectralefficiencyandpowerefficiencycharacteristics,andthusasamodulationtechniqueiswidelyusedinmanycurrentwirelessstandards(GSM,DECT,CDPD).Theformofareviewofarelativelycoherentdemodulationandnon-coherentdemodulation
2、technique.Reservestherighttonon-coherentdifferentialdetectionprogramshavefastsynchronization,andhardwaresimplicityadvantagesatthesametime,theuseofdecisionfeedbackequalization(DFE),anon-redundanterrorcorrection(NEC)andothertechnologytoenhancetheperformanceoftheconventionaldif
3、ferentialdemodulatoranduseacombinationofseveraltechniquestoavarietyofnewdemodulationscheme.Thisarticleelaboratesonthecausesofthedeclineinthewirelesscommunications.WiththedeclineofsexualRoadstatisticalmodeltomodelthewirelesschannel.Theuseofcomputersimulationdemodulationscheme
4、inthethermalnoise,multipathfading,Dopplershift,andtheerrorrateperformanceundertheco-channelinterferenceandothercommunicationsenvironment.GMSKIntroductionGaussianMinimumShiftKeying(GMSK)whichhasgoodspectralefficiencyduetoradiationandlow-band,constantenvelopecharacteristicsmak
5、esitabletousethehighpowerefficiencyofClassCamplifier.Theseexcellentfeaturesmakeitasanefficientdigitalmodulationschemesarewidelyusedinavarietyofcommunicationsystemsandstandards.Including:BasedonGSMtechnologydevelopedbytheEuropeanTelecommunicationsStandardsInstitute(ETSI)speci
6、ficationdevelopedbyGlobalCommunications(GSM)digitalcellularmobilesystems;FormulatedbytheEuropeanPostandTelecommunicationsAssociation(CEPT),EuropeanTelecommunicationsStandardstheETS1300a175CordlessTelecommunicationsstandard(DECT);TheUnitedKingdomandHongKong-basedcommunication
7、standardforcordlessphones(CordlessPhones)andtelecommunicationspoints(Telepoint)system,CT-2andCT-3system;BasedonEricsson'sMobitexprotocol,Mobitexsystem(Europe),andRAMMobileDataSystem(U.S.);EstablishmentofwirelessdataservicesintheNorthAmericanAdvancedMobilePhoneSystem(AMPS)Cel
8、lularDigitalPacketData(CDPD)system;Third-generationpersonalcommunicationssy
