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TCM在Pattern时延差编码通信体制中的应用.docx

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TCM在Pattern时延差编码通信体制中的应用 Abstract Patterntimedelaycodingisapromisingcommunicationschemeinthefieldofwirelesscommunication.TCMisanerrorcorrectingcodingtechniquethatcanbeappliedtopatterntimedelaycodingtoimprovethetransmissionreliability.Inthispaper,weexploretheapplicationofTCMinpatterntimedelaycodingcommunicationsystem.WefirstintroducethebasicprinciplesofpatterntimedelaycodingandTCM,andthenweanalyzetheadvantagesandchallengesofapplyingTCMinpatterntimedelaycoding.Finally,wesummarizethepotentialimprovementincommunicationqualityandthefutureresearchdirectionsofTCMinthisfield. Introduction Withtherapiddevelopmentofwirelesscommunicationtechnology,thedemandforhighdataratetransmissionandreliablecommunicationhasbecomeincreasinglyurgent.Whileexistingcommunicationtechniquessuchasfrequencydivisionmultipleaccess(FDMA)andcodedivisionmultipleaccess(CDMA)havebeenwidelyused,patterntimedelaycoding(PTDC)hasemergedasapromisingsolutionforreliablehighdataratetransmission.PTDCisatypeofpulsepositionmodulation(PPM)andisbasedontransmittingasequenceofdelayedpatterns.Comparedwithtraditionalmodulationschemes,ithasadvantagesofhighcodingefficiencyandanti-interferenceability.However,toachievebettertransmissionreliability,errorcorrectingcodesarerequired. Turbocodeisatypicaltypeoferrorcorrectingcodeusedinwirelesscommunication.However,itsapplicationinPTDCsuffersfromhighdecodingcomplexityandlongdecodingdelay.Trelliscodedmodulation(TCM)isanothererrorcorrectingcodingtechniquethatcanbeusedinPTDC.TCMcombinescodingandmodulationintooneprocessandhasbeenwidelyusedinwirelesscommunication.ThispaperaimstoexploretheapplicationofTCMinPTDCcommunicationsystemandanalyzeitsadvantagesandchallenges. BasicprinciplesofPTDCandTCM ThebasicprincipleofPTDCistotransmitasequenceofdelayedpatternsassymbols.Thetransmittedpatternsequenceiscalledthepatterntrain,andthetimedifferencebetweenadjacentpatternsiscalledthepatterndelaytime.Thereceiverfirstsynchronizesthereceivedsignalwiththetransmittedtiminginformation,andthensamplesthereceiveds