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不同混沌调制方式在基于超宽带系统的体内信道下的性能表现（英文）.docx

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不同混沌调制方式在基于超宽带系统的体内信道下的性能表现（英文） Introduction Asthedemandforwirelesscommunicationinmedicalapplicationscontinuestogrow,ultra-wideband(UWB)technologyisincreasinglybeingusedduetoitsabilitytoprovidehigh-speeddatatransmissionwithlowpowerconsumptionandstrongsecurity.InUWBcommunication,chaosmodulationisaneffectivemethodforimprovingtheperformanceofthesysteminanindoorenvironment.ThispaperaimstocomparetheperformanceofdifferentchaosmodulationtechniquesinUWBsystemsforin-bodycommunicationchannels. Background Ultra-widebandcommunicationsystemshaveawiderangeofapplications,includingmedicalmonitoringandimaging.Thein-bodycommunicationchannelpresentsuniquechallengesduetotheabsorptionandscatteringofelectromagneticwavesbytissue,whichleadstohighattenuationandmultipathdistortion.Chaosmodulationhasbeenshowntobeeffectiveinmitigatingthesechallengesbyintroducingapseudo-randomsequenceintotheUWBsignal.Thisimprovesperformancebyincreasingthedivergenceofthesignalspectrum,reducinginterferencefromothersignals,andimprovingtheanti-jammingabilityofthesystem. ChaosModulationTechniques ThereareseveralchaosmodulationtechniquesthatcanbeusedinUWBsystems.Theseinclude: 1.Chaoticshiftkeying(CSK):Thistechniqueuseschaoticsignalstomodulatethephaseofacarriersignal.CSKhasbeenshowntohavegoodperformanceinUWBsystemsduetoitsabilitytoincreasethesignal-to-noiseratio(SNR)andreducethebiterrorrate(BER). 2.Chaoticpulsepositionmodulation(CPPM):ThistechniqueutilizeschaoticsequencestomodulatethepositionofthepulsesinaUWBsignal.CPPMhasbeenshowntoprovidegoodresistancetointerferenceandnoiseduetoitsabilitytospreadthesignalenergyoveralargerbandwidth. 3.Chaoticamplitudemodulation(CAM):ThistechniqueuseschaoticsequencestomodulatetheamplitudeofaUWBsignal.CAMhasbeenshowntohavegoodperformanceinin-bodycommunicationduetoitsabilitytoreduceinterferenceandnoise. PerformanceComparison Tocomparetheperformanceofthedifferentchaosmodulationtechniques,wesimulatedaUWBsysteminatypicalin-bodycommunicationchannel.ThesimulationwascarriedoutusingMATLAB/Simu